Connect Tech Inc.'s opinion, fail to be in good working order during the warranty period, Connect Tech Inc. will, at its option, repair or replace this product at no charge, provided that the product has not been subjected to abuse, misuse, accident, disaster or non Connect Tech Inc.
Class A Computing Device Blue Heat/Net Connect Tech Inc. declares that the product(s) covered by the contents of this manual have been tested and found compliant with the below listed standards as required by the Electromagnetic Compatibility (EMC) Directive for General Immunity Compliance.
Understanding virtual COM ports .................15 Customer Support Overview ................16 Contact Information ....................16 Blue Heat/Net Installation Overview ......................17 Hardware Installation.............................17 Connecting the Blue Heat/Net to your Network:...........17 Direct Connect......................17 Connecting to the Network..................17 Ethernet LEDs......................18 Serial Port LEDs......................19 Connecting Serial Devices ...................19 RS-232 Connections: ....................19...
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Common Configuration Setups ................100 Static IP Setup......................100 DHCP Setup......................101 DIN Rail Mounting Option:..................102 How the Blue Heat/Net Boots Up ...............104 Bootup Sequence....................105 Flowchart of Special Operations Mode using the reset button ......106 Asynchronous communications Tutorial ..............106 Serial Line Interface Tutorial ................107 RS-232 Line Interface: ...................107...
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Connect Tech Blue Heat/Net User’s Manual List of Figures Figure 1: LED locations on 2, 4 and 8 port Blue Heat/Net models ............. 18 Figure 2: Typical RS-232 null modem connection ..................19 Figure 3: Basic 3-wire RS-232 null modem connection................19 Figure 4: Recommended pinouts for loopback connectors.
Your industrial serial communication devices will no longer be tied to a single computer. The Blue Heat/Net hardware is easy to install, involving little more than plugging the unit into the appropriate locations and performing some simple configuration steps, as outlined in this manual.
Blue Heat/Net and often this is part of the existing networking infrastructure. Putting some serial ports in a remote location can be as easy as plugging in a Blue Heat/Net to the Ethernet Network. This provides a simple, clean cabling arrangement.
Customer Support Overview If you experience difficulties after reading the manual and/or using the product, contact the Connect Tech reseller from which you purchased the product. In most cases the reseller can help you with product installation and difficulties. In the event that the reseller is unable to resolve your problem, our highly qualified support staff can assist you.
The most common method involves connecting your Blue Heat/Net to network hardware at the facility where you are installing the Blue Heat/Net device. The hub or switch could be in a network closet in your building, or locally on your desk or workbench. This connection is achieved using a straight through Ethernet cable;...
Blue Heat/Net Ethernet jack. Ethernet LEDs On 4 and 8 port Blue Heat/Net models, the front panel features Ethernet and Serial Port LEDs to monitor activity. The left front side of the box features five LEDs. (Two port models feature the CPU LED on the face of the device between the two serial port LEDs.
RS-232 Connections: Typical RS-232 null modem connection This is the typical way to connect to DTE type devices, such as the Blue Heat/Net. It is used when hardware RTS-to-CTS flow control is required. The cable required is called a cross-over or null modem cable, and is readily available at any electronics retailer/distributor.
Loopback Connectors: Loopback connectors are useful for performing diagnostics. The following are the recommended pinouts for creating loopback connectors for your Blue Heat/Net products. Figure 4: Recommended pinouts for loopback connectors. DB-9: For DB-9 female loopback connectors we recommend solder cup DB-9 connectors and 28 AWG solid core wire.
Connect Tech Blue Heat/Net User’s Manual Connecting Power The Blue Heat/Net uses a standard DC power jack for power input. The Blue Heat/Net can be safely connected or disconnected at any time. New BNG (RoHS compliant) models include the additional option for 9 to 30V DC power input using a Phoenix locking screw terminal connector.
Connect Tech Blue Heat/Net User’s Manual To activate the Special Operations Mode, hold the reset button while the unit is powering up. Hold the button until all the port LEDs blink rapidly. Release the reset button. The port LEDs will continue to flash rapidly after the reset button is released to indicate the Special Operations Mode is active.
LED Error Codes If an error is detected during the bootup process, an error condition and code are displayed on the LEDs on the face of the Blue Heat/Net. • The error condition is signaled by a rapidly flashing CPU LED (about 10 to 20 per second).
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Connect Tech Blue Heat/Net User’s Manual Table 2: LED error codes for Blue Heat/Net 2 port LED key: CPU rapid error flash Slow flash Fast flash (50 ms on/off) (1 s on/off) (.25 s on/off) Error Code and Event Details...
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Connect Tech Blue Heat/Net User’s Manual This will occur when any of the enabled Check network Can’t obtain an Operating System boot sources (Flash or BOOTP/TFTP or connections, image (uClinux) to run. TFTP) fail to obtain a valid compressed server Operating System image to run.
The 4 and 8 port Blue Heat/Nets feature a simple vertical mounting bracket. First fasten the mounting bracket to the vertical surface, and then slide the Blue Heat/Net onto the bracket. The bracket is designed so that the serial port connectors face down.
A patch cable is optionally available with the Blue Heat/Net, part number: CB006. Direct Connect You can connect your Blue Heat/Net directly to a computer without a hub or switch. You will need standard cross-wired CAT 5 network patch cable. Revision 0.13...
Manager section. This will launch HyperTerminal that comes with Windows XP. Unplug the power to the Blue Heat/Net and plug it back in. Light indicators 1 to 8 (or 1 to 4) will blink sequentially. This sequential flashing will last for 30 seconds. You must log in during this window.
PPP connections are often used in applications that require remote monitoring. You can set the Blue Heat/Net to behave as either the dial out or “client” side (PPP Originate) or the answering or “server” side (PPP Answer).
Connect Tech Blue Heat/Net User’s Manual This application is used to change the configuration settings of Blue Heat/Net units by connecting to a serial port on the Blue Heat/Net from a terminal (or terminal emulation program on a PC). Configuration Data Space (CDS) This is the area, in non-volatile (Flash) memory, which stores the configuration parameters.
The command line buffer is limited to the size of the FIFO on the serial port, which is 64 characters for the RJ-45 model and 128 for the DB-9 model of the Blue Heat/Net. If an SCM command is entered with no options specified, the command shows the syntax of its options and the current setting of those options.
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“Operating System image”). delay= This sets the time duration for accessing the SCM application. It can be set from 2 to 30 seconds, the default is 30. (See the section How the Blue Heat/Net Boots up for more information). Revision 0.13...
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[-nosave] [-no_reset][-login] Syntax: Description: This command is to exit the SCM and reboot the Blue Heat/Net. If CDS changes have been made a warning message is issued and the SCM will not exit. -nosave Options: Exit without saving changes (abandon changes).
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This command is a shortcut for quickly setting all the IP addresses of the unit. See note below. my_ip= | mip= This sets the IP address of the Blue Heat/Net unit (default is 192.168.42.1). See note below. server_ip= | sip= This sets the Server IP address.
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This sets the Domain name of the unit. (The default is blueheat.net) Host name=1 host = This sets the Host name of the Blue Heat/Net unit. (The default is BHNssssssss, where “ssssssss” is the serial number of the unit). tcp= This sets the base TCP port number used for Host TCP/IP and UDP/IP communications.
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This specifies the port number to change or query. If the port number is omitted, the command returns a summary of all the ports on the Blue Heat/Net. N where N is 1 to the number of ports on the unit.
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Connect Tech Blue Heat/Net User’s Manual stop_bits= | stop= This sets the number of stop bits 1 (default) software_flow= | sflow= This sets the software (xon/xoff) flow control mode. none (default) receive (xoff is transmitted when the FIFO buffer fills, xon is...
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Connect Tech Blue Heat/Net User’s Manual 1 to the FIFO size of the UART (default is FIFO size) The following options are not implemented [local_loopback= | llb=] [special_char_mode= | scm=] [error_char= | errch=] [break_char= | brkch=] [event_char= | evtch=] [use_xoff_xon_limits= | xlim=] [xofflim=] Revision 0.13...
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This specifies the port number. This number can be any valid port number starting at 1 to the number of ports available on the particular Blue Heat/Net unit. If the port number is omitted, the command returns the personality of all ports on the Blue Heat/Net.
SCM, and offers some additional features. Getting Access to TCM The TCM is accessed via a telnet connection to the Blue Heat/Net unit. Any standard telnet application program can be used, (i.e PuTTY). If you are using DHCP to dynamically assign an...
• exit Exits the TCM application • help Brief list of available commands and their syntax • info Blue Heat/Net general information and Flash verification • Network settings • port Serial port settings, and UART information • save Save setting changes to Non-volatile (Flash) storage •...
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Options: This specifies the port number. This number can be any valid port number starting at 1 to the number of ports available on the particular Blue Heat/Net unit. list This displays the current white list for the specified port. Remember, if the list is empty, any client (any IP) can access the port.
WCM (Web Configuration Manager) Signing In to the Web Configuration Manager You will need to know the IP address of your Blue Heat/Net unit before you use the Web Configuration Manager. Use the Serial Configuration Manager to assign the Blue Heat/Net a valid IP address, or tell the Blue Heat/Net to use DHCP to automatically obtain an IP address.
Connect Tech Blue Heat/Net User’s Manual Configuring Your Blue Heat/Net There are five main configuration options for your Blue Heat/Net. These include basic serial settings, advanced serial settings, security settings, Blue Heat/Net settings and Firmware. The Reboot and Change your Password options are also located here. The options for each configuration screen are described in the following sections.
This page contains basic or common serial settings. Here you can configure the default baud rate, parity, start bits, stop bits and flow control for each of your Blue Heat/Net ports. DB-9 models include a Mode option to set the line interface mode. The initial values for each port are: •...
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The personalities include: Blue Heat/Net: This is the default option and refers to the normal behavior of the Blue ● Heat/Net port. In most applications, the default setting will suit the application. There is no need to set anything beyond the regular configuration options of the Web Configuration Manager.
Point-to-Point Protocol (PPP) Options It is possible to configure a Blue Heat/Net port to behave as a PPP connection. This enables you to run network protocols over a serial link. This link can be a direct serial connection using a null modem cable, or a modem link via telephone, cell or satellite line.
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Connect Tech Blue Heat/Net User’s Manual For more detailed information about using PPP, visit www.tldp.org/HOWTO/PPP-HOWTO/index.html PPP Call Choose PPP Call and click Configure. The PPP Call configuration page consists of four script files. The Options configuration file includes system default information such as baud rate, modem connection, flow control, peer authorization and IP addresses (local and remote) assigned to the port.
Raw TCP Client and click Configure. The Raw TCP Client page requires you specify the IP Address to which the Blue Heat/Net will try to connect. The IP address can be specified in the input box in the format 1.2.3.4 or as a DNS name (www.connecttech.com, for example). Specify the TCP Port number and click Submit.
Connecting Two Blue Heat/Nets together using standard TCP You can directly connect two Blue Heat/Net devices by configuring a serial port on one to Raw TCP Server, and a serial port on the second to Raw TCP Client. Serial data received by one Blue Heat/Net can then be sent through a network or the internet to the second Blue Heat/Net’s serial...
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(or the server Blue Heat/Net is not plugged in). If ping is successful, recheck your client and server settings. If you can Telnet into the Blue Heat/Net, log in and type in cat /var/log/syslog. If the TCP •...
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• port number specified in the Server setting with your Telnet client. Try connecting the Telnet client to port 23 on the Blue Heat/Net. If you can't get to the • login prompt, you need to resolve network connection issues. There is configuration information in the Blue Heat/Net setup.
This list of IP Addresses: This option will allow a given set of IP addresses to access a Blue Heat/Net serial port. Simply type in the list of IP addresses in the Text Field provided. Current Blue Heat/Net models do not allow you to specify a range of IP addresses (i.e.
Serial Configuration Manager. You can specify a particular port, or specify the Scan All Ports option. In this case the Blue Heat/Net will scan all ports for the password when the Blue Heat/Net is booting. The default setting is Scan All Ports.
TCP Port: This option allows you to change the starting local TCP port that is used to service clients connecting to the Blue Heat/Net unit. The default TCP port is 49152. When altering the TCP port on the Blue Heat/Net unit, you must also alter it on the user’s side.
Figure 17: Firmware Upgrades/Downloads Restore Defaults The Restore Defaults page enables you to quickly reset all or some of the default basic, advanced, security, Blue Heat/Net or system settings of your Blue Heat/Net. Figure 18: Restore Default Settings Revision 0.13...
When you make configuration changes, the changes are stored temporarily in memory. If you reboot your Blue Heat/Net at this point, any configuration changes you made will be lost. To permanently save your changes, you need to save them to Flash. In order to do this, click the Save to Flash button on the upper right-hand side of the Web Configuration Manager page.
Blue Heat/Net unit. Monitor Serial Port Traffic This page allows you to monitor your serial port traffic. For each Blue Heat/Net port, you can view the number of bytes transmitted, received, whether the port is using flow control, if there are any Parity/Framing/Overrun errors, and which remote IP address is connected to your serial port.
Figure 21: Monitoring Network Traffic Monitor TCP/IP Statistics This page allows you to view TCP, IP, UDP and ICMP statistics for your Blue Heat/Net. This page also has a link which describes each of the network statistic parameters. Simply click on the Parameter Descriptions link, and a new window will open up which contains a description of each parameter.
This page provides you with three display options: Hardware, Software and Performance. Use this link to find information such as device serial number, runtime software versions and firmware versions. Figure 23: My Blue Heat/Net Hardware Details Figure 24: My Blue Heat/Net Software Details Revision 0.13...
Ethernet protocol and vice versa. Blue Heat/Net acts as a client on the serial side and as a server on the Ethernet side, enabling the use of software on the Ethernet side to control or read values from devices connected on the serial side.
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Connect Tech Blue Heat/Net User’s Manual BACnet IP Configuration When you click on the BACnet IP Configuration button, you'll see a screen containing the following information: Nodes Node_Name , Node_ID Virtual_BCU_1 , 11 The Node_Name is the name of the device and is for reference only. The Node_ID refers to the node number on the BACnet IP network.
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PLC. This value can be one of PLC3, PLC5, or Slc5. Port is the Blue Heat/Net port you wish to use with this device. P1 refers to port Serial1, etc. You can have multiple devices connected to the same port in an RS-485 configuration. You can also have devices connected to multiple ports.
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Modbus RTU Configuration Node_Name is used below to get and set data from the device. The Node_ID is the user assigned Modbus RTU address of the device. Port refers to the port on Blue Heat/Net. P1 is serial 1, etc.
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Modbus ASCII configuration Node_Name is used below to get and set data from the device. The Node_ID is the user assigned Modbus RTU address of the device. Port refers to the port on Blue Heat/Net. P1 is serial 1, etc.
Connect Tech Blue Heat/Net User’s Manual refers to the number of data points to be read from the device. The Scan_Interval is the speed at which we wish to read the values from the device. Restoring to Factory Configuration All of the protocols can be returned to their original factory settings by entering the configuration for that protocol and clicking the Restore Defaults button.
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Connect Tech Blue Heat/Net User’s Manual If we change the length of the Modbus RTU array to 30, here's what we get: Protocol Mapping File From: Length: Modbus RTU[00001] Modbus TCP[00001] AB DF1[B13:0] Modbus TCP[00031] From the perspective of the Modbus TCP protocol, now the first 30 addresses are used by Modbus RTU (starting at address 00001, followed by DF1 at address 00031).
This section deals with installing and using the Blue Heat/Net software to communicate with your Blue Heat/Net and its COM ports. To do so, you will use the CD included with the Blue Heat/Net to install the Configuration Manager on your computer. The Blue Heat/Net Configuration Manager will allow you install the Blue Heat/Net on your local system, and map and configure the Blue Heat/Net’s communication...
Connect Tech Blue Heat/Net User’s Manual Select View from the Blue Heat/Net software. It will bring you to the following screen. Click Install to begin the Configuration Manager installation. Ensure you choose Open or Run when the File Download window appears and asks if you’d like to open the file or save it to your computer.
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Connect Tech Blue Heat/Net User’s Manual Next you will have the option to launch the configuration manager after installation. The installer will install the Configuration Manager into C:\Program Files\CTI\Blue Heat Net. If you’d prefer an alternate location, specify in the space provided, or click Browse to locate the new folder.
Yes and then jump ahead to the Auto Discover Blue Heat/Net section) Right-click on My Blue Heat/Net Place or click on the Action menu to pull up the sub menu options. There are three ways to install a Blue Heat/Net device: Configure Default Blue Heat/Net, Add New Blue Heat/Net or Auto Discover Blue Heat/Net.
Heat/Net and the configuration information for installation. If it cannot connect, it will not install the unit. The Blue Heat/Net may get the IP address from DHCP server or it can be manually fixed. The Configuration Manager will use 49152 as the default TCP port. This value is configurable.
IP address, Host Name, Number of available ports and the MAC address. To install a Blue Heat/Net check the appropriate box under Serial # column and then click OK. Right click for more options, including the option to launch the Web Configuration Manager.
Connect Tech Blue Heat/Net User’s Manual Port Mapping To map the available ports of the Blue Heat/Net (either eight or four, depending on your model), right-click on Blue Heat/Net # and then select Map Port(s). You can also select Action from the main menu, and choose Map Port(s).
Figure 36: Map Port(s) Express method screen This will install all the available ports of the selected Blue Heat/Net with one click. The list box Starting COM Port enables the user to select the starting COM number. If a COM number with in use is selected, ensure those ports are not attached to a device by going to My Computer ->...
Connect Tech Blue Heat/Net User’s Manual Figure 37: Found New Hardware Wizard Select Install the software automatically. Click Next. If you are running Windows 2000 this wizard will not appear. Upon successful installation, this window will appear: At this point a Software Installation window will appear and warn that the software hasn’t passed Windows Logo testing for Windows XP.
Connect Tech Blue Heat/Net User’s Manual If there are more ports to map, the Found New Hardware Wizard will appear again. Repeat the procedure above until all the ports are mapped. The ports are now mapped, and the Configuration Manager window should appear similar to the one below.
Connect Tech Blue Heat/Net User’s Manual Basic The Basic option installs all the available ports of the selected Blue Heat/Net, one port at a time. It has two list boxes, Blue Heat/Net Port and Local COM Port. Figure 39: Basic Port Mapping option Blue Heat/Net Port: This refers to the physical COM port on the Blue Heat/Net as labelled on its enclosure.
It has three columns, Blue Heat/Net Port, Status and Local Port. Blue Heat/Net Port refers to the physical port on Blue Heat/Net, Status refers to whether the port is mapped or not and Local Port refers to the possible COM numbers that the Win32 application will use.
Unmap Port(s): This option is located under the Action menu item when the Blue Heat/Net unit is selected, or an individual port is selected. . It is also available by right-clicking on the selected Blue Heat/Net unit or port.
Figure 42: Unmap Port window If you choose Unmap Port while the Blue Heat/Net unit is selected, you will see a list of ports. Blue Heat/Net Port refers to the port on the Blue Heat/Net and Local Port refers to the corresponding COM port on the computer for Win32 applications.
Connect Tech Blue Heat/Net User’s Manual Right-click on the port you wish to observe, and choose Port Properties. A window will open with three tabs: General, Port Settings and Driver. The General properties include port and COM number, serial number, device type, manufacturer and location.
In this mode data will not be marked as sent until the Blue Heat/Net has actually sent the data. This allows for tight synchronization between the application and the data transmission. Data is reported as soon as it is sent to the Blue Heat/Net when this mode is not turned on. Leaving this mode unselected improves throughput.
For example 300 would be set to 300 and 110 would be set to 110. COM Port Number The Blue Heat/Net driver supports the ability to change COM port names, also referred to as COM port mapping. Use this combo box to change the COM port number to be used for the current port.
The new settings will take effect after clicking Replacing your Blue Heat/Net: This option is located under the Action menu when the Blue Heat/Net unit is selected. It is used if you need to replace the selected Blue Heat/Net with another Blue Heat/Net. You must have the new unit’s MAC address or IP address, as you will be prompted to supply one of these...
Selecting Remove Blue Heat/Net in the Action menu will remove the Blue Heat/Net device you have selected from your system. To remove more than one Blue Heat/Net at a time, select My Blue Heat/Net Places, and either right-click or choose Action from the menu, and select Remove All Blue Heat/Net.
(like minicomm) and a null modem cable. You should now have a set of Blue Heat/Net ports available as /dev/bhnS* . The file bhn.conf is used to set the serial port mappings. For more information on serial port mapping in Linux, please refer to the Readme.txt located on the Blue Heat/Net CD.
Connect Tech’s FTP directory. Upgrade using SCM (Serial Configuration Manager) The SCM method of upgrading is used when the Blue Heat/Net does not boot properly. You can reinstall your original firmware from the supplied CD, or you can download any newer versions...
Connect Tech Blue Heat/Net User’s Manual Products Model Ports Surge Line Interface Serial Connector BN002 RS-232 8 circuit RJ-45 Jack BN004 RS-232 8 circuit RJ-45 Jack BN006 RS-232/422/485 DB-9 Male BN008 RS-232/422/485 DB-9 Male BN009 RS-232 DB-9 Male BN010 (2MB Flash)
Connect Tech Blue Heat/Net User’s Manual Protocol Descriptions The Blue Heat/Net supports a variety of protocols. The following is a brief explanation of each and how they are implemented. Address Resolution Protocol, a method used to find a unit’s Ethernet MAC address from its Internet address.
Typical RS-232 null modem connection: This is used to connect to DTE type devices. The Blue Heat/Net is a DTE type device. Used when Hardware RTS->CTS flow control is required. This cable is also called a cross over cable and is commonly available at any Electronics retailer/distributor.
Basic “3 wire” RS-232 null modem connection: This is used to connect to DTE type devices. The Blue Heat/Net is a DTE type device. Used when Hardware RTS->CTS flow control is not required. This cable is also called a cross over cable.
Loopback Connectors: Loopback connectors are useful for performing diagnostics. The following are the recommended pinouts for creating loopback connectors for Blue Heat/Net products. Figure 51: Loopback connectors, DB-9 and RJ-45 DB-9: For making DB-9 Female loopback connectors we recommend using solder cup DB-9 connectors and 28 AWG solid core wire.
Four-wire (full duplex, “RS-422 mode”) Wiring without hardware flow control. Four-wire (full duplex multi-drop, “RS-485 mode”) Note: The flow control signals, RTS and CTS should be connected as per diagram when unused to prevent loss of performance on your Blue Heat/Net Revision 0.13...
Connect Tech Blue Heat/Net User’s Manual Two-wire (1/2 duplex, “RS-485 mode”) Wiring One device connected to Blue Heat/Net Two devices connected to Blue Heat/Net RS-485 Multi-drop Topology, Two-Wire and Four-Wire When wiring multi-drop RS-485 networks, it is necessary to wire the devices in a “Daisy Chain”, they must not be wired with a “Star”...
Connect Tech Blue Heat/Net User’s Manual Default Settings Network Settings Blue Heat/Net IP address 192.168.42.1 Server IP address 0.0.0.0 (used for firmware downloads) Gateway IP address 0.0.0.0 Subnet Mask 255.255.255.0 Broadcast IP address 255.255.255.255 (used by the bootp process) Domain Name Server IP address: 0.0.0.0 (used for firmware downloads) Domain Name blueheat.net...
Static IP is often the best choice if you are trying to connect via WAN or through a Firewall. It can be difficult to resolve the Blue Heat/Net’s IP address if you use DHCP in this instance. The default configuration is a static IP of 192.168.42.1. In most cases this will not be the address you want to use in your network.
Enter exit. The unit will reboot using the new settings. Using WCM Connect to the Blue Heat/Net using a web browser by entering the current IP of the unit in the address. Log on by supplying the username and password. The default login is wcm and the default password is password.
The two-port Blue Heat/Net and DB-9 models of the four and eight port Blue Heat/Net include the option for DIN rail mounting. The Blue Heat/Net 2 requires two DIN rail clips (part number MS010) that attach to the body of the device.
Connect Tech Blue Heat/Net User’s Manual Four and eight-port DB-9 models can be DIN rail mounted with the addition of a DIN rail bracket, ordered separately as part number MS009. This part number includes the clips. Figure 51: DIN rail mount option for four and eight port DB-9 models...
Connect Tech Blue Heat/Net User’s Manual How the Blue Heat/Net Boots Up Each time the Blue Heat/Net is powered-up or rebooted with an appropriate command, a certain sequence of software execution occurs. The Booter runs from Flash memory first. Its job is to perform the following: Setup the embedded processor Validate at least one of the redundant Loaders (via a CRC check).
Connect Tech Blue Heat/Net User’s Manual Bootup Sequence Start Boot from Decompress Decompress Flash uClinux from Flash Enabled? to SDRAM Obtain boot Bootp Server information from Enabled? Responds Bootp Server Update CDS (RAM copy) Information (filename & IP address) Attempt TFTP...
Figure 53: Bootup sequence via Reset Button Asynchronous communications Tutorial The Blue Heat/Net features four or eight asynchronous serial communication ports. Asynchronous communications is a simple, cost effective means of terminal serial communication. For this reason, it is widely used for communications on personal computers, bar codes readers, printers, terminals and much more.
TIA/EIA-232. The RS-232 specification signals levels of +3V to +15V for a logic 0 or Space, and -3V to -15V for a logic 1 or Mark. The Blue Heat/Net has RS-232 signal levels with a typical range of +/- 8 Volts. The maximum cable length you can use with RS-232 is dependant...
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Connect Tech Blue Heat/Net User’s Manual Any noise injected into the wires is cancelled at the receiver, leaving only the original, undistorted data signal. Twisted pair cables are always used in RS-485, this ensures that the communications are robust and as error free as possible. RS-485 signal levels are between 0 and 5 Volts, the differential voltage can be as little as 200mV.
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Blue Heat/Net. The communication is “half duplex”, meaning that receive and transmit traffic occur on the same wire. The Blue Heat/Net and devices can not receive data and transmit data at the same time.
(enable). Software and hardware in the Blue Heat/Net and the RS-485 devices will always place its transmitter into the high impedance mode when not transmitting. This feature is managed by the Blue Heat/Net and is fully transparent to your application.
Connect Tech Blue Heat/Net User’s Manual Bias and Termination Resistors in RS-485 networks: Termination Resistors in RS-485 networks: RS-485 networks often benefit from the installation of termination resistors. Termination is rarely required for lower baud rates, for example 9600 baud or less. However, RS-485 networks are transmission lines, and can suffer from the electrical effects of ringing, or undershoot and overshoot, all of which can cause data errors, especially at higher baud rates, like 115.2 Kbps.
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Blue Heat/Net configuration tools. These settings will be stored in the Flash memory on the Blue Heat/Net. The setting is immediately applied when the setting is changed and automatically applied after a reset/reboot. Note that the Bias and Termination network is one network; you can not apply only bias or only termination.
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