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Connect Tech Blue Heat/Net Sync User Manual

Ethernet-to-serial synchronous communications
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Blue Heat/Net Sync
User Manual
Ethernet-to-Serial Synchronous Communications
Connect Tech Inc.
42 Arrow Road
Guelph, Ontario
N1K 1S6
Tel:
519-836-1291
Toll:
800-426-8979 (North America only)
Fax:
519-836-4878
Email: sales@connecttech.com
support@connecttech.com
Web:
www.connecttech.com
CTIM-00044 Revision 0.03 , July 8, 2010

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  • Page 1 Blue Heat/Net Sync User Manual Ethernet-to-Serial Synchronous Communications Connect Tech Inc. 42 Arrow Road Guelph, Ontario N1K 1S6 Tel: 519-836-1291 Toll: 800-426-8979 (North America only) Fax: 519-836-4878 Email: sales@connecttech.com support@connecttech.com Web: www.connecttech.com CTIM-00044 Revision 0.03 , July 8, 2010...

  • Page 2: Limited Lifetime Warranty

    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.

  • Page 3: Customer Support Overview

    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.

  • Page 4: Certification Statements

    Preliminary: Testing is still pending. Class A Computing Device 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.

  • Page 5: Table Of Contents

    Connect Tech Blue Heat/Net Sync User Manual Table of Contents ........................2 Limited Lifetime Warranty ..........................2 Copyright Notice ........................ 2 Trademark Acknowledgment ........................ 3 Customer Support Overview ..........................3 Contact Information ........................4 Certification Statements ..........................5 Table of Contents ............................
  • Page 6 Connect Tech Blue Heat/Net Sync User Manual ....................27 info ....................27 ..................... 29 save ..................29 update ................ 31 WCM (Web Configuration Manager) ..........31 Signing In to the Web Configuration Manager ............33 Configure Advanced Serial Settings ............ 33 Configure Blue Heat/Net Sync Settings ................

  • Page 7: List Of Figures

    Connect Tech Blue Heat/Net Sync User Manual ....................69 DHCP Setup ................... 69 Using SCM ..............69 How the Blue Heat/Net Sync Boots Up .................... 70 Bootup Sequence ......71 Flowchart of Special Operations Mode using the reset button ............71 Asynchronous Communications Tutorial ...................

  • Page 8: List Of Tables

    Connect Tech Blue Heat/Net Sync User Manual List of Tables Table 1: BlueHeat/Net Sync Power Connections and Current Specifications ......16 Table 2: Connector Properties ...................... 16 Table 3: Available Special Operations ..................18 Table 4: LED Error Codes for Blue Heat/Net Sync ..............19 Table 5: Chip Selects ........................

  • Page 9: Introduction

    Connect Tech Blue Heat/Net Sync User Manual Introduction Connect Tech‟s Blue Heat/Net Sync allows remote access to synchronous/asynchronous serial devices via an Ethernet LAN or the Internet. Blue Heat/Net Sync network-enables serial communication devices that are designed to be connected to serial ports so that the devices no longer need to be tied to a single computer.

  • Page 10: Understanding Virtual Com Ports

    Sync to the Ethernet network. This provides a simple, clean cabling arrangement. Port Sharing – In some applications it is desirable to have a serial resource that is accessed and shared by more than one host computer. Connect Tech‟s virtual serial port technology allows this to be done easily.

  • Page 11: Hardware Installation

    Connect Tech Blue Heat/Net Sync User Manual Hardware Installation Connecting the Blue Heat/Net Sync to Your Network: Before you begin, take a minute to ensure that your package includes the required components for your Blue Heat/Net Sync: • One Blue Heat/Net Sync unit •...

  • Page 12: Serial Port Leds

    Connect Tech Blue Heat/Net Sync User Manual Serial Port LEDs The serial ports LEDs indicate serial activity for each port. • A flashing LED indicates that the port in question is receiving or transmitting data. Connecting Serial Devices V.28 Connections: V.28 has signaling levels the same EIA RS232.

  • Page 13: Rs-422/V.11 Connections

    Connect Tech Blue Heat/Net Sync User Manual RS-422/V.11 Connections The following are basic connections that can be accomplished when the I/O levels are in V.11 (RS- 422) mode. V.11 mode signaling can be enabled with EIA-530, RS-449 or X.21 modes on your Blue Heat/Net Sync.

  • Page 14: Loopback Connectors

    Connect Tech Blue Heat/Net Sync User Manual Loopback Connectors Loopback connectors are useful for performing diagnostics. The following figure illustrates the recommended pinouts for creating loopback connectors for Blue Heat/Net Sync. DB-25 Male 2 - TX 3 - RX 4 - RTS...

  • Page 15: Connecting Power

    Connect Tech Blue Heat/Net Sync User Manual Connecting Power The Blue Heat/Net Sync uses either a standard DC power jack or a Phoenix locking screw terminal connector for power input. The Blue Heat/Net Sync can be safely connected or disconnected at any time. The standard power supply requirements are as follows: Model BMG006 5V (2.5A) power input using a DC barrel or Phoenix screw terminal connector.

  • Page 16: Table 1: Blueheat/Net Sync Power Connections And Current Specifications

    Connect Tech Blue Heat/Net Sync User Manual Table 1: BlueHeat/Net Sync Power Connections and Current Specifications BlueHeat/Net Connector plug Connector Voltage Current Description type Polarity 4 Port DB25 Centre Positive 5VDC 875mA Synchronous / Asynchronous models (Rev A) Left Positive...

  • Page 17: Activating The Special Operations Mode And Default Settings

    Connect Tech Blue Heat/Net Sync User Manual Activating the Special Operations Mode and Default Settings Blue Heat/Net Sync includes a push button on the rear of the unit beside the DC power connector. This push button can be used to perform special operations such as resetting the unit to its default settings or forcing port scanning in situations where the SCM is not accessible.

  • Page 18: Power On Diagnostics

    Connect Tech Blue Heat/Net Sync User Manual Table 3: Available Special Operations Special Operation Number of presses (and binary Usage representation) Force port scanning to ONE press This forces the first two ports to RS-232 first two ports mode, causing the SCM to scan these ports...

  • Page 19: Table 4: Led Error Codes For Blue Heat/Net Sync

    Connect Tech Blue Heat/Net Sync User Manual In the above example, a rapidly flashing CPU LED during the boot up process signifies the Blue Heat/Net Sync has experienced an error. Port LEDs 1 through 4 signify which error has occurred. In this case, LED 2 and 3 are on, so the error code is 6. The chart below defines the error details for each error code.
  • Page 20 Connect Tech Blue Heat/Net Sync User Manual This will occur when any of the enabled Check network Cannot obtain an operating system boot sources (flash or BOOTP/TFTP or connections, server image (uClinux) to run. TFTP) fail to obtain a valid compressed computer or your unit's operating system image to run.

  • Page 21: Scm Cabling Requirements

    Connect Tech Blue Heat/Net Sync User Manual uClinux checks the CDS version number If you have updated the Mismatched CDS version number against its expected CDS version uClinux code via SCM number. If they are different, uClinux and have not updated the does not continue its operation.

  • Page 22: Set The Ip Address Using The Web Configuration Manager

    Connect Tech Blue Heat/Net Sync User Manual Set the IP Address Using the Web Configuration Manager NOTE: If you use the Windows Configuration Manager and use Auto Discover to locate your Blue Heat/Net Sync on the network, you can right-click and launch the Web Configuration Manager from there.

  • Page 23: Blue Heat/Net Sync Configuration

    Connect Tech Blue Heat/Net Sync User Manual Blue Heat/Net Sync Configuration The Blue Heat/Net Sync comprises several software components, each of which manages various functions of the Blue Heat/Net Sync. The following is a breakdown of these components.  Operating System Software...

  • Page 24: Cds (Configuration Data Space)

    Connect Tech Blue Heat/Net Sync User Manual program on a PC). Configuration Data Space (CDS) This is the area, in non-volatile (flash) memory, which stores the configuration parameters. CDS (Configuration Data Space) Description The Blue Heat/Net Sync has a number of configuration parameters which are stored in a non- volatile (flash memory) area.

  • Page 25: Scm (Serial Configuration Manager)

    Connect Tech Blue Heat/Net Sync User Manual SCM (Serial Configuration Manager) Description The Serial Configuration Manager is one of the applications you can use to access the Configuration Data Space (CDS) settings of the Blue Heat/Net Sync. Since the CDS stores the default serial port settings, it is important that the line mode is configured prior to first use.

  • Page 26: Command Details

    Connect Tech Blue Heat/Net Sync User Manual  save Save setting changes to non-volatile flash storage  update Download a new operating system via TFTP and flash, (uClinux) and loader/SCM image. Command Details boot boot [mode=] [file=] [delay=] Syntax: Description: This command establishes the Blue Heat/Net Sync boot-up mode.

  • Page 27: Exit

    Connect Tech Blue Heat/Net Sync User Manual password= This sets the password phrase, which is used to gain access to the SCM and WCM modes of configuring the Blue Heat/Net. The default is “password”. prompt= This setting controls whether a password prompt (and other password entry status information) is presented to the terminal.
  • Page 28 Connect Tech Blue Heat/Net Sync User Manual [my_ip= | mip=] [server_ip= | sip=] [gateway_ip= | gip=] [subnetmask= | snm=] [broadcast_ip= | bcip=] [dns_ip=] [domain=] [host name=1 host=] [tcp=] [mac=] [dhcp=] Description: Establishes the network settings. network= | net= Options: Sets the “network” portion of the IP address into my_ip, server_ip and gateway_ip.

  • Page 29: Save

    Connect Tech Blue Heat/Net Sync User Manual mac= This displays the MAC address of the unit. (The default is 00:0C:8B:SS:SS:SS, where SS:SS:SS is the hex value of the serial number of the unit). Note: The MAC address cannot be changed, it can only be displayed.
  • Page 30 Connect Tech Blue Heat/Net Sync User Manual server_ip= | sip= Specify the Server IP address from which the file is to be downloaded. file= Specify the file name to download. If the –jffs option is chosen, then the file= option is mandatory.

  • Page 31: Wcm (Web Configuration Manager)

    Connect Tech Blue Heat/Net Sync User Manual WCM (Web Configuration Manager) Signing In to the Web Configuration Manager You will need to know the IP address of your Blue Heat/Net Sync unit before you use the Web Configuration Manager. Use the Serial Configuration Manager to assign the Blue Heat/Net Sync a valid IP address, or tell the Blue Heat/Net Sync to use DHCP to automatically obtain an IP address.

  • Page 32: Figure 14: Blue Heat/Net Sync Settings

    Connect Tech Blue Heat/Net Sync User Manual Figure 14: Blue Heat/Net Sync Settings Revision 0.03...

  • Page 33: Configure Advanced Serial Settings

    Connect Tech Blue Heat/Net Sync User Manual Configure Advanced Serial Settings The Web Configuration Manager also allows you to configure more advanced serial port properties. These advanced properties will allow you to configure the XOn Character, XOff Character, Break Character, Escape Character, Error Character and Event Character, and Transmit Load Setting for each serial port.
  • Page 34 Connect Tech Blue Heat/Net Sync User Manual • Server IP Address: This option sets the server IP address. This is used as the Server address to use when bootp mode or TFTP mode is enabled. The default Server IP address is 0.0.0.0 •...

  • Page 35: Configure Firmware

    Connect Tech Blue Heat/Net Sync User Manual Figure 15: Configuring Blue Heat/Net Sync Settings Configure Firmware This section enables you to download new firmware to the Blue Heat/Net Sync unit. Select a download source and a specific firmware file path, if applicable, and then submit the download request.

  • Page 36: Saving To Flash

    Connect Tech Blue Heat/Net Sync User Manual NOTE: This function is not currently operational. Figure 17: Restore Default Settings Saving To Flash When you make configuration changes, the changes are stored temporarily in memory. If you reboot your Blue Heat/Net Sync at this point, any configuration changes you made will be lost.

  • Page 37: Monitoring Your Blue Heat/Net

    Connect Tech Blue Heat/Net Sync User Manual Figure 18: Saving To Flash If you haven't made any configuration changes, the Save To Flash button will remain grey. Monitoring Your Blue Heat/Net The Blue Heat/Net Sync WCM lets you monitor serial port activity, network traffic and TCP/IP statistics as well as providing hardware and software details for your Blue Heat/Net Sync unit.

  • Page 38: Monitor Network Traffic

    Connect Tech Blue Heat/Net Sync User Manual Monitor Network Traffic This page allows you to view all network activity on your Blue Heat/Net. For each active network connection, you can view the local IP address and port, the remote IP address and port, the status of the connection, the protocol being used, as well as the number of queued transmit and receive bytes.

  • Page 39: Figure 22: My Blue Heat/Net Sync Hardware Details

    Connect Tech Blue Heat/Net Sync User Manual Use this link to find information such as device serial number, runtime software versions and firmware versions. Figure 22: My Blue Heat/Net Sync Hardware Details Figure 23: My Blue Heat/Net Sync Software Details...

  • Page 40: Software Installation For Windows

    Connect Tech Blue Heat/Net Sync User Manual Software Installation for Windows The Blue Heat/Net Sync is designed for easy installation and set up. This section deals with installing and using the Blue Heat/Net Sync software to communicate with your Blue Heat/Net Sync.

  • Page 41: Figure 25: Blue Heat/Net Sync Software Installation Screen

    Connect Tech Blue Heat/Net Sync User Manual Figure 25: Blue Heat/Net Sync Software Installation Screen Revision 0.03...
  • Page 42 Connect Tech Blue Heat/Net Sync User Manual The Blue Heat/Net Configuration Manager Setup Wizard will begin. Click Next to start. Next you will have the option to launch the configuration manager after installation. Revision 0.03...
  • Page 43 Connect Tech Blue Heat/Net Sync User Manual 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. Click Next.

  • Page 44: Running The Configuration Manager

    Connect Tech Blue Heat/Net Sync User Manual Running the Configuration Manager If you chose the option to launch the Blue Heat/Net Sync Configuration Manager after installation, the main Configuration Manager window should now be open on your screen. If you did not, you can launch it from the CTI default folder or whichever folder you chose during the installation.

  • Page 45: Configure Default Blue Heat/Net Sync

    Connect Tech Blue Heat/Net Sync User Manual Configure Default Blue Heat/Net Sync You can choose this option when your Blue Heat/Net Sync still has a factory default IP address of 192.168.42.1. It will launch the Web Configuration Manager for this IP address, enabling...

  • Page 46: Auto Discover Blue Heat/Net Sync

    Connect Tech Blue Heat/Net Sync User Manual Auto Discover Blue Heat/Net Sync The auto discover will broadcast a message to all the Blue Heat/Net Sync devices on your network. Upon receiving the broadcast packet, the Blue Heat/Net Sync device will respond.

  • Page 47: Firmware Upgrades

    If you need to re-install your current firmware, it is located in the firmware directory of the CD you received with your Blue Heat/Net Sync. Newer firmware versions are available from Connect Tech‟s website, http://www.connecttech.com/asp/Support/DownloadZone.asp. Choose Blue Heat/Net Sync product. Ensure the following parameters are set: mip, sip, gip and dns_ip using the SCM. To upgrade your Blue Heat/Net Sync firmware, you can use any of the following three methods, depending on your preference.

  • Page 48: Software Development

    Connect Tech Blue Heat/Net Sync User Manual Software Development Hardware Information The information provided in this section will offer data pertaining to the hardware components present within the Blue Heat/Net Sync unit. Hardware information documentation will encompass hardware resources, base address map, memory map and table, as well as, PLD registers.

  • Page 49: Table 6: Interrupts

    Connect Tech Blue Heat/Net Sync User Manual Interrupts INT * Usage /INT1, /INT2 IUSC logically or-ed interrupts. IUSC Interrupts can be muxed to any of the two INTs. One use is to mux all ports configured for Async mode to one IRQ and all ports configured for Sync mode to another interrupt.

  • Page 50: Memory Map Of Iusc And Pld Functions

    Connect Tech Blue Heat/Net Sync User Manual Memory Map of IUSC and PLD Functions ColdFire (5272) Bus: A ColdFire CS# signal is used to select the entire region, setup with the following attributes… 8K (8192) byte region 16 Bit bus Use TA# signal to terminate the bus cycle (this places wait state generation in the hands of the PLD logic).

  • Page 51: Pld Resource Access

    Connect Tech Blue Heat/Net Sync User Manual A[5..1] Addresses IUSC registers (see Memory Map Table below). A[0] Not used explicitly, A0 (along with BS0# and BS1#) select byte size portions of IUSC registers. PLD Resource Access: A[12] Must be one (1).
  • Page 52 Connect Tech Blue Heat/Net Sync User Manual Address Area (item) Register Notes Offset Accessed Accessed (in hex) Writes go to the Transmitter FIFO Reads come from the Receiver FIFO IUSC-0 Sreg IUSC-0 Sreg RCSR IUSC-0 Sreg RICR IUSC-0 Sreg IUSC-0 Sreg...
  • Page 53 Connect Tech Blue Heat/Net Sync User Manual Address Area (item) Register Notes Offset Accessed Accessed (in hex) Reserved, do not access 1A0 1A9 IUSC-0 Dreg RBCR IUSC-0 Dreg RARL IUSC-0 Dreg RARU Reserved, do not access 1B0 1B9 IUSC-0 Dreg...
  • Page 54 Connect Tech Blue Heat/Net Sync User Manual PLD Registers: Offset Reg Name Valid Bit Descriptions Reset Values (Hex) 1000 RTCU D15..0 Control Bits: Read/Write only as a 16 Bit word. 0000 Real Time Clock Upper Msk1 IntEN Msk0 Msk1: On writes, set this bit to mask bits 14..8. This prevents previous settings of bits 14..8 from being changed.
  • Page 55 Connect Tech Blue Heat/Net Sync User Manual 1008 LIFC1,2,3,4 D15..0 Control Bits: Read/Write only as a 16 Bit word. 100C Line Interface 1010 Control 0007 DCDC DCDS CTSC CTSM1 CTSM0 1014 1008= Port 1 Important Note: These control bits are transferred to ALL the Line Interface PLD‟s by a serial interface. On each write to any of the 4 control registers, a serial 100C = Port 2 transfer is started.
  • Page 56 Connect Tech Blue Heat/Net Sync User Manual 1018 PLD_CNTRL D15..0 Control Bits: Read/Write only as a 16 Bit word. 0000 Control Bits IM[3] IM[2] IM[1] IM[0] TRG[3] TRG[2] TRG[1] TRG[0] IABT SMIE SR[3] SR[2] SR[1] SR[0] IUSC Software Reset: SR[0]=Port1… SR[3]=Port4. Reset is asserted while bit is set to 1. Also, the “Line Interface Control”bits for the given SR[3..0]...
  • Page 57 Connect Tech Blue Heat/Net Sync User Manual System Block Diagrams Revision 0.01...
  • Page 58 Connect Tech Blue Heat/Net Sync User Manual Revision 0.03...

  • Page 59: Port Settings, Clock Setup And General Settings

    Connect Tech Blue Heat/Net Sync User Manual Port Settings, Clock Setup and General Settings Required [conditions] Optional [conditions] (blank) means setting parameter is not required for the mode. TBD means To be Determined at a later date. Async MonoSync BiSync...
  • Page 60 Connect Tech Blue Heat/Net Sync User Manual Async MonoSync BiSync Trans-BiSync HDLC Serial Mode (smode) BHN_PortSettings sync_addr.rx0 Required Required Required Required sync_addr.rx1 Required Required Optional sync_addr.rx_len Required Required Required sync_addr.strip_sync Optional Optional Optional dbits.t/rx Required Required Required Required Required tx_frac_stop Required parity.t/rx...

  • Page 61: Iusc Clocking Logic

    Connect Tech Blue Heat/Net Sync User Manual IUSC Clocking Logic: The following diagram was scanned from the IUSC manual page 4-3 and corrections have been made. Do not use the diagram from the IUSC manual, use the corrected version we have provided below.

  • Page 62: Appendix

    Connect Tech Blue Heat/Net Sync User Manual Appendix Blue Heat/Net Sync Specifications Operating Environment 4 port model: 0ºC to 60ºC (32ºF to 158ºF) Communications Baud Rates: Synchronous: Up to 9.216 Mbps with internal reference clock, up to 10 Mbps with external reference clock.

  • Page 63: Protocol Descriptions

    Connect Tech Blue Heat/Net Sync User Manual Protocol Descriptions The Blue Heat/Net Sync 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.

  • Page 64: Pinouts

    Connect Tech Blue Heat/Net Sync User Manual Pinouts DB-25 Female Pinouts DB25F Line Mode Pin # Signal Name V.35 EIA-530 RS232 EIA-530A X.21 V.28 in brackets (V.28) (V.11) V.35 V.11 Hi-Z V.11 V.11 TX- (TX) V.35 V.11 V.28 V.11 V.11 V.35...

  • Page 65: Female Pinouts

    Connect Tech Blue Heat/Net Sync User Manual DB-9 Female Pinouts DB9F Signal Name [1] Functional Notes RTC_Clear Clears and holds the seconds count of the Real Time Clock at [3], [6] RTC_Seconds Provides the external time base for the Real Time Clock.

  • Page 66: Multi-Drop Communications Using V.11 / Rs422/Rs485 Line Modes

    Connect Tech Blue Heat/Net Sync User Manual Multi-drop Communications Using V.11 / RS422/RS485 Line Modes 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” topology, see diagram.

  • Page 67: Default Settings

    Connect Tech Blue Heat/Net Sync User Manual Default Settings Network Settings Blue Heat/Net Sync 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)

  • Page 68: Common Configuration Setups

    Connect Tech Blue Heat/Net Sync User Manual Common Configuration Setups Static IP Setup In some networking environments it is best to have the IP address set to a fixed value. The advantage is that since it is fixed, connecting to it can be a lot simpler.

  • Page 69: Dhcp Setup

    Connect Tech Blue Heat/Net Sync User Manual DHCP Setup In many modern networks IP numbers are not static but are automatically assigned by a DHCP server and can change over time or on each power up. DHCP must be enabled on the Blue Heat/Net Sync because it is shipped to use a default static IP (192.168.42.1)

  • Page 70: Bootup Sequence

    Connect Tech Blue Heat/Net Sync User Manual Bootup Sequence Start Decompress Boot from Decompress uClinux from Flash Flash Enabled? to SDRAM Obtain boot Bootp Server information from Enabled? Responds Bootp Server Update CDS (RAM copy) Information (filename & IP address)

  • Page 71: Flowchart Of Special Operations Mode Using The Reset Button

    Connect Tech Blue Heat/Net Sync User Manual Flowchart of Special Operations Mode using the reset button Power Up Increment Selection Pressed Reset Button Show Held Selection State Reset Held On Port LEDs Button Wait for Button Release Continue Booting Figure 31: Bootup Sequence via Reset Button Asynchronous Communications Tutorial The Blue Heat/Net Sync features four synchronous/asynchronous serial communication ports.

  • Page 72: Serial Line Interface Tutorial

    Connect Tech Blue Heat/Net Sync User Manual Figure 32: Typical Asynchronous Date Frame Serial Line Interface Tutorial RS-232 Line Interface: RS-232 is the simplest, least expensive line interface standard, the Sipex tranceivers used on the Blue Heat/Net Sync refer to RS232 as V.28 mode. It is also referred to as EIA232 and TIA/EIA- 232.

  • Page 73: Basic 4-Wire, Full Duplex Communications

    Connect Tech Blue Heat/Net Sync User Manual mode RS-485 is fully compatible with RS-422; which is considered a subset of RS-485. The use of differential transmitters and receivers ensures RS-485 communications are reliable and robust. This means two wires are used to transmit or receive a signal. One wire carries the true or non-inverted signal;...

  • Page 74: Multi-Drop 4-Wire, Full Duplex Communications

    Connect Tech Blue Heat/Net Sync User Manual Multi-drop 4-Wire, Full Duplex Communications: In a multi-drop 4-wire differntial network, two to 32 devices are connected together. Note that each RS-485 receiver counts as a device or “load”. In this multi-drop mode of communication, a master slave protocol must be enforced, that is, all communication is initiated by the master, in this case a Blue Heat/Net Sync.

  • Page 75: Bus Contention On Differential Multi-Drop Networks

    Connect Tech Blue Heat/Net Sync User Manual Bus Contention on Differential Multi-drop Networks: Bus contention occurs when two or more devices enabled on a bus attempt to run the bus to opposite logic values. From the diagram above, we can see that there are multiple differential transmitters (TXD) on the bus.

  • Page 76: Termination Resistors In Differential Networks

    Connect Tech Blue Heat/Net Sync User Manual Termination Resistors in Differential Networks Termination Resistors in Differential Networks: Differential networks often benefit from the installation of termination resistors. Termination is rarely required for lower baud rates, for example 9600 baud or less. However, differential...

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