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Connect Tech Echo/ISA User Manual

Multi-port serial communications adapters
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Connect Tech Inc.
"Industrial Strength Communications"
Echo/ISA
Multi-port Serial Communications
Adapters
User Manual
Connect Tech Inc
42 Arrow Road
Guelph, Ontario
N1K 1S6
Tel: 519 836-1291
800-426-8979
Fax: 519 836-4878
Email: sales@connecttech.com
URL: http://www.connecttech.com
CTIM-00023 Rev. 0.00 Nov. 5, 2003
Part Number: MN005
Echo User's Manual, ver. 0.00

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  • Page 1 Connect Tech Inc. “Industrial Strength Communications” Echo/ISA Multi-port Serial Communications Adapters User Manual Connect Tech Inc 42 Arrow Road Guelph, Ontario N1K 1S6 Tel: 519 836-1291 800-426-8979 Fax: 519 836-4878 Email: sales@connecttech.com URL: http://www.connecttech.com CTIM-00023 Rev. 0.00 Nov. 5, 2003 Part Number: MN005 Echo User's Manual, ver.

  • Page 3: Limited Lifetime Warranty

    Tech Inc. products. Should this product, in 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 4: Copyright Notice

    Copyright/Trademarks Copyright Notice The information contained in this document is subject to change without notice. Connect Tech shall not be liable for errors contained herein or for incidental consequential damages in connection with the furnishing, performance, or use of this material.

  • Page 5: Table Of Contents

    Table of Contents Chapter 1: Introduction Conventions & Symbols ............. 1-1 Product Overview ..............1-2 Echo Adapter..............1-2 Echo Software ..............1-3 Customer Service Overview ............1-3 RMA Overview................1-6 Chapter 2: Hardware Installation Introduction................2-1 Configuration ................2-1 Port Addresses..............2-2 Custom Port Addresses..........
  • Page 6 Contents Windows 95 ..............3-29 Echo Enhanced Driver ..........3-30 Installation............3-31 UART/FIFO Configuration......3-32 Configuration............3-33 Windows NT ..............3-37 Configuration............3-37 Chapter 4: Appendices Appendix A: Specifications ............4-1 Operating Environment ............. 4-1 Power Requirements ............4-1 PC Bus Interface..............4-1 Communications..............
  • Page 7 Contents List of Tables Table 1: Typical port address usage........... 2-2 Table 2: Switch settings(Echo) ..........2-1 Table 3: Typical IRQ assignments..........2-2 Table 4: Multiuser DOS: port details ......... 3-9 Table 5: DB-9 pinouts - Echo ............ 4-2 Table 6: Echo DB-78 pinouts............. 4-3 Table 6(continued): Echo DB-78 pinouts ........
  • Page 8 Chapter 1: Introduction Conventions & Symbols ............. 1-1 Product Overview ..............1-2 Echo Adapter..............1-2 Echo Software ..............1-3 Customer Service Overview ............1-3 RMA Overview................1-6 Echo User's Manual, ver. 0.00...

  • Page 9: Chapter 1: Introduction

    The "Warning" convention advises you to take certain precautions in order to avoid possible damage to your Connect Tech product. This message warns you that your Connect Tech product is very sensitive to static electricity. Make sure that before handling the product you practice proper ESD procedures.

  • Page 10: Product Overview

    DFlex DOS device drivers (the Echo is backwards compatible with our discontinued ISA product, the DFlex. While the drivers will contain reference to the DFlex product, they are fully compatible with the Echo/ISA.) Echo Adapters Echo adapters provide the high speed interfaces between a host computer and multiple external serial devices.

  • Page 11: Echo Software

    Chapter 3: Software Installation. Customer Service Overview If you experience difficulties after reading the manual and 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.

  • Page 12: Figure 1: Problem Summary Sheet

    Chapter 1: Introduction Figure 1: Problem summary sheet Problem Description Connect Tech Product Description Product: Revision no.: Product serial no.: No. of serial ports: IRQ selected: Base address selected: I/O port address selected: Device driver: Revision no.: System Description Operating system: Revision no.:...
  • Page 13 Chapter 1: Introduction We offer three ways for you to contact us: Mail/Courier You may contact us by letter and our mailing address for correspondence is: Connect Tech Inc. c/o Customer Service 42 Arrow Road Guelph, Ontario Canada N1K 1S6 Email/Internet You may contact us through the Internet.

  • Page 14: Rma Overview

    Chapter 1: Introduction RMA Overview Connect Tech products requiring warranty or non warranty repairs need an RMA number. To obtain a Return Merchandise Authorization (RMA) Number please contact us in the following manner: Go to the found in the on our...

  • Page 15: Introduction

    Note: 1. Please pack the item for repair securely and ship it prepaid and insured. Connect Tech is not liable for damage or loss to the product due to shipping. 2. Connect Tech will not accept items for repair without an RMA number.
  • Page 16 Chapter 2: Hardware Installation Introduction................2-1 Configuration ................2-1 Port Addresses..............2-2 Custom Port Addresses..........2-3 Status Port Address ............2-4 Custom Status Port Addresses ........2-4 Interrupt Selection ............. 2-5 Installing the Echo Adapter in your System...... 2-7 Echo User's Manual, ver. 0.00...

  • Page 17: Configuration

    Chapter 2: Hardware Installation Introduction Hardware installation involves configuration of the Echo adapter. Note: Please refer to Chapter 3: Software Installation for installation of your Echo board under certain operating systems. The following sections detail how to change the field configurable parameters.

  • Page 18: Port Addresses

    Chapter 2: Hardware Installation Port Addresses You configure port addresses with DIP switches 1 to 5 on SW1. Switches 3 to 5 select a set of port addresses for the ports, while you can override the setting for port 1 and 2 with switch 1 and 2 respectively.

  • Page 19: Custom Port Addresses

    You can generate other port addresses by making changes to the programmable logic found on the Echo adapters. If you require specific port addresses not listed please contact the Connect Tech sales department for further information. Figure 2: DIP switch block SW1 IRQ channel(s) Status port address (see Tables 2 &...

  • Page 20: Status Port Address

    DIP switches 3, 4 and 5, determines the status port address. Tables 1 and 2 indicate the relationship. Custom Status Port Addresses Custom status port addresses are available with the Echo/ISA. Please contact Connect Tech Customer Support for more details. Echo User's Manual, ver. 0.00...

  • Page 21: Interrupt Selection

    Chapter 2: Hardware Installation Interrupt Selection You can configure Echo boards to use one, two or no interrupt request lines. To select the appropriate configuration, you must program DIP switch 8 on SW1 and the IRQ jumper block J1. When DIP switch 8 is on, all Echo communication ports will interrupt on the A channel.

  • Page 22: Table 3: Typical Irq Assignments

    Chapter 2: Hardware Installation Many other devices such as the keyboard and disk drives also require an IRQ. Table 3 shows some typical IRQ assignments. Table 3: Typical IRQ assignments Device Timer output Keyboard Reserved COM2, COM4, SDLC COM1, COM3, SDLC Unassigned (typically) Floppy disk controller LPT1...

  • Page 23: Installing The Echo Adapter In Your System

    Chapter 2: Hardware Installation Installing the Echo Adapter in your System To install your Echo adapter in your computer follow these steps: Computer components are very sensitive to static electricity. Make sure that you wear an anti-static wrist-band when installing adapters in your computer. Handle the adapter by its edges and place it on the anti-static bag or an anti-static mat.

  • Page 24: Chapter 3: Software Installation

    Chapter 3: Software Installation Introduction................3-1 Configuration ................3-1 DOS 3.XX - 6.XX ............. 3-2 COMSET.EXE ............3-2 DFLEX.SYS ............. 3-3 CTIMODE ..............3-3 Accessing Ports ..............3-3 Character Device Access .......... 3-4 INT 14h Access ............3-4 Linux ................. 3-7 Multiuser DOS 7 GOLD ...........

  • Page 25: Introduction

    2. If you did not receive a driver diskette for your operating system or you require additional information, please go to of the on the Connect Tech Download Zone Support Center website for product manuals, installation guides and device driver software.

  • Page 26: Comset.exe

    (numbers and addresses are found inside the front cover of the manual). The Connect Tech DOS device driver will support up to a maximum of 32 serial ports. The standard COM driver and BIOS will only support up to four ports.

  • Page 27: Dflex.sys

    Chapter 3: Software Installation - DOS DFLEX.SYS DLEX.SYS is a device driver that allows you to set port addresses for software access of up to 32 ports . To install the device driver, add the following command to your CONFIG.SYS file: DEVICE = DFLEX.SYS [options] Where...

  • Page 28: Character Device Access

    Chapter 3: Software Installation - DOS Character Device Access Character device access provides a "high level" interface which is appropriate for simple applications and tests. Each port is given a device name which you can access similar to a file. The device name is formed by concatenating the port number to the name ( if not specified by the...
  • Page 29 Chapter 3: Software Installation - DOS Function 0 - Initialize the port Input: ah = 0 al = baud, parity, length dx = channel ( 0 = com1, 1 = com2, ... ) Bit designations for al are: data length 1 0 - 7 bits 1 1 - 8 bits stop bits...
  • Page 30 Chapter 3: Software Installation - DOS Function 2 - Receive character Input: ah = 2 dx = port number Return: ah = port status ( timeout if bit 7 is set ) al = character received Function 3 - Return port status Input: ah = 3 dx = port number...

  • Page 31: Linux

    If these sources do not provide you with the help you need please contact a Connect Tech Technical Support Representative via email, telephone or fax for further information (numbers and addresses are found inside the front cover of the manual).

  • Page 32: Multiuser Dos 7 Gold

    If these sources do not provide you with the help you need please contact a Connect Tech Technical Support Representative via email, telephone or fax for further information (numbers and addresses are found inside the front cover of the manual).

  • Page 33: Table 4: Multiuser Dos: Port Details

    Chapter 3: Software Installation - Multiuser DOS 7. Provide all of the after assigning the port. Set the Port Details as per the chart below: Port Port XOR Mask Table 4: Multiuser DOS: port details PORT AND MASK XOR MASK STATUS PORT Note: *** The status port depends on the base port addresses...

  • Page 34: Figure 4: Multiuser Dos: Switch Settings

    3-10 Chapter 3: Software Installation - Multiuser DOS Figure 4: Multiuser DOS: switch settings IRQ channel(s) IRQ line for all ports is on channel A Status port address Status port is enabled (2C0 hex) Reserved - must be OFF Base address sets: Port 1 = address 280 hex Port 2 = address 288 hex Port 3 = address 290 hex...

  • Page 35: Configuration

    Download Zone Knowledge Database Support Center on the Connect Tech website for product manuals, installation guides, device driver software and technical tips. If these sources do not provide you with the help you need please contact a Connect Tech Technical Support...

  • Page 36: Figure 6: Qnx 2.Xx: Switch Settings

    3-12 Chapter 3: Software Installation - QNX 2.XX Figure 6: QNX 2.XX: switch settings IRQ channel(s) IRQ line for all ports is on channel A Status port address Status port is disabled Reserved - must be OFF Base address sets: Port 1 = address 280 hex Port 2 = address 288 hex Port 3 = address 290 hex...

  • Page 37: Figure 7: Qnx 2.Xx: Irq Settings

    Chapter 3: Software Installation - QNX 2.XX 3-13 Use the command to vector the selected interrupt to the stty intcp serial handler and the command to enable that interrupt. stty inton Note: You can find more information on these commands by referring to the command in your QNX Operating System stty...

  • Page 38: Configuration

    3-14 Chapter 3: Software Installation - QNX 4.XX QNX 4.XX QNX 4.XX controls standard serial devices in a system with its standard serial port driver . When installing Echo boards Dev.ser under the QNX 4.XX operating system, refer to Dev.ser in the QNX 4 Utilities Reference Manual for more information.
  • Page 39 Download Zone Knowledge Database Support Center on the Connect Tech website for product manuals, installation guides, device driver software and technical tips. If these sources do not provide you with the help you need please contact a Connect Tech Technical Support...

  • Page 40: Figure 8: Qnx 4.Xx: Switch Settings

    3-16 Chapter 3: Software Installation - QNX 4.XX Figure 8: QNX 4.XX: switch settings IRQ channel(s) IRQ line for all ports is on channel A Status port address Status port is disabled Reserved - must be OFF Base address sets: Port 1 = address 280 hex Port 2 = address 288 hex Port 3 = address 290 hex...

  • Page 41: Figure 10: Qnx 4.Xx: Switch Settings

    Chapter 3: Software Installation - QNX 4.XX 3-17 The command line example shown below assumes that COM1 and COM2 are port 1 and port 2 on the Echo adapter. Example: Dev.ser 3f8,4 2f8,3 310,4 318,3 320,4 328,3 330,4 338,3 & The above example configures an Echo adapter port 1 for COM1 at 3F8 hex, IRQ4;...

  • Page 42: Figure 11: Qnx 4.Xx: Irq Settings

    3-18 Chapter 3: Software Installation - QNX 4.XX Figure 11: QNX 4.XX: IRQ settings 10 11 12 15 Note: All Echo odd ports are interrupting on channel A, IRQ 4 and all Echo even ports are interrupting on channel B, IRQ 3. Echo User's Manual, ver.

  • Page 43: Qnx 6.Xx

    If these sources do not provide you with the help you need please contact a Connect Tech Technical Support Representative via email, telephone or fax for further information (numbers and addresses are found inside the front cover of the manual).

  • Page 44: Sco Unix

    3-20 Chapter 3: Software Installation – SCO Unix SCO Unix This section describes how to setup an Echo adapter for operation under SCO Unix. Configuration Step 1 You can setup your Echo adapter for many hardware configurations. Set the DIP switches on switch block SW1 and jumpers on jumper block J1 for your Echo adapter and install the it in your computer.

  • Page 45: Figure 12: Sco Unix: Switch Settings

    Download Zone Knowledge Database Support Center on the Connect Tech website for product manuals, installation guides, device driver software and technical tips. If these sources do not provide you with the help you need please contact a Connect Tech Technical Support...

  • Page 46: Figure 13: Sco Unix: Irq Settings

    3-22 Chapter 3: Software Installation – SCO Unix Figure 13: SCO Unix: IRQ settings 10 11 12 15 Note: All ports are interrupting on channel A, IRQ 10 Step 2 You now must make an entry for the Echo adapter in the file .
  • Page 47 Chapter 3: Software Installation – SCO Unix 3-23 Where: [COM] This parameter allows you to assign a COM to the serial adapter. There are four available COM assignments under SCO Unix.: 0 = COM1 1 = COM2 2 = COM3 3 = COM4 Note: COM refers to a serial board and not a specific port.
  • Page 48 3-24 Chapter 3: Software Installation – SCO Unix [Device description] A comment field used to describe the device 3. Make a copy of this entry and modify it to reflect the settings of your Echo adapter. Example {2,STARGATE,8,10,16,(sd)0x280,0x280+STAR_POLL, 8,MCRBIT3},/*AT-Echo-8*/ This example entry reflects a base address setting of 280h and an IRQ setting of 10 for an Echo adapter.
  • Page 49 Chapter 3: Software Installation – SCO Unix 3-25 Step 3 You now must modify the file to insure the proper alignment of the minor numbers. 1. Change the directory to the /usr/lib/mkdev/perms directory and backup the file SER 2. Open the file with your editor.
  • Page 50 3-26 Chapter 3: Software Installation – SCO Unix Step 4 You now must run which creates special device files mkdev serial to interface with the operating system’s serial driver. When running , select the appropriate number of ports being mkdev serial installed (8 for the Echo adapter).

  • Page 51: Other Configurations

    In order to do this, it will be necessary to modify certain system files. Consult the "Release Notes" section of your operating system manuals or contact Connect Tech's Customer Support for more information. Technical Tips If you experience difficulties installing your Echo adapter try the following steps: 1.

  • Page 52: Solaris

    If these sources do not provide you with the help you need please contact a Connect Tech Technical Support Representative via email, telephone or fax for further information (numbers and addresses are found inside the front cover of the manual).

  • Page 53: Windows 95

    Zone Knowledge Database Support Center Connect Tech website for product manuals, installation guides, device driver software and technical tips. If these sources do not provide you with the help you need please contact a Connect Tech Technical Support Representative...

  • Page 54: Echo Enhanced Driver

    3-30 Chapter 3: Software Installation - Windows 95 Echo Enhanced Driver The Connect Tech enhanced serial port driver extends the functionality of the standard Windows 95 Device driver to include support for newer, high performance UARTs. The Enhanced Driver supports both the older UARTs (16450, 16550) and the newer UARTs (16750) for Windows 95.

  • Page 55: Installation

    3-31 Installation The following instructions outline how to install the Echo Enhanced Driver on a previously uninstalled Connect Tech Echo port. 1. If the driver is on disk, insert the disk into the desired drive. If you have downloaded the driver in ZIP format, unzip the files to a temporary directory.

  • Page 56: Uart/Fifo Configuration

    3-32 Chapter 3: Software Installation - Windows 95 UART/FIFO Configuration To configure the Echo Enhanced Driver for the appropriate UART type please follow these steps: 1. From the double click on the icon. CONTROL PANEL SYSTEM 2. The dialog box will pop up and click SYSTEM PROPERTIES on the tab.

  • Page 57: Configuration

    Chapter 3: Software Installation - Windows 95 3-33 Configuration The following installation assumes that your computer system comes with two standard serial ports, COM1 (at 3F8, IRQ 4); and COM2 (at 2F8, IRQ 3). 1. You need to choose a range of I/O addresses for your Echo adapter that will not conflict with any other addresses.

  • Page 58: Figure 15: Windows 95: Irq Settings

    3-34 Chapter 3: Software Installation - Windows 95 2. Choose an IRQ for your Echo. It is possible to have the even ports on one IRQ and the odd ports on a different IRQ, but we recommend having all ports on one IRQ. Good choices of IRQ's are 5, 10, 11, 12 and 15.
  • Page 59 Chapter 3: Software Installation - Windows 95 3-35 5. A window will now appear with the headings RESOURCE . The settings shown are probably wrong. TYPE SETTING Do not worry we will change them later. Click NEXT Another window will appear. Click on FINISH 6.
  • Page 60 3-36 Chapter 3: Software Installation - Windows 95 9. The window will appear. Click SYSTEMS SETTINGS CHANGE and repeat Steps 7 through 9 until you have setup all your Echo serial ports. Click when you have set up all your Echo ports.

  • Page 61: Windows Nt

    Zone Knowledge Database Support Center Connect Tech website for product manuals, installation guides, device driver software and technical tips. If these sources do not provide you with the help you need please contact a Connect Tech Technical Support Representative...

  • Page 62: Figure 16: Windows Nt: Switch Settings

    3-38 Chapter 3: Software Installation - Windows NT Figure 16: Windows NT: switch settings IRQ channel(s) All ports will interrupt on Channel A Status port address When OFF, status port is disabled Reserved - must be OFF Base address sets: Port 1 = address 280 hex Port 2 = address 288 hex Port 3 = address 290 hex...

  • Page 63: Figure 17: Windows Nt: Irq Settings

    Chapter 3: Software Installation - Windows NT 3-39 Figure 17: Windows NT: IRQ settings 10 11 12 15 Note All Echo ports interrupt on Channel A, IRQ 10. Technical Tip You can run under DOS the DOS programs porttest.exe to verify your settings and assure you have no portfind.exe hardware conflicts.
  • Page 64 3-40 Chapter 3: Software Installation - Windows NT 12. Click the button but do not select the option DONE REBOOT yet. 13. Repeat steps 7 through 12 for the remaining Echo serial ports, each time specifying the appropriate I/O port address (i.e., 288, 290, 298, etc.) and the same IRQ (i.e., 10).
  • Page 65 Chapter 3: Software Installation - Windows NT 3-41 Method B This method is more complex than Method A and involves writing information regarding the Echo status port to the Windows NT registry. Since this method will enable your Echo adapter’s status port, you will attain better system performance in the way of less CPU usage.
  • Page 66 3-42 Chapter 3: Software Installation - Windows NT 14.19. Choose , then , and enter in the EDIT ADD VALUE following values EXACTLY as below. Value Name: InterruptStatus Data Type: REG_DWORD Value: (Highlight Hex format Check Box) Note: 1. For our example of Base I/O address 280, the Echo status port is at I/O address 2C0.
  • Page 67 Chapter 3: Software Installation - Windows NT 3-43 Technical tips 1. You can test the additional serial ports with a program like Terminal or HyperTerminal. 2. A test program is available on the DFlex DOS Driver diskette (p/n: DISK306). It is a Windows 95 and Windows NT compatible test program.

  • Page 69: Chapter 4: Appendices

    Chapter 4: Appendices Appendix A: Specifications ............4-1 Operating Environment ............. 4-1 Power Requirements ............4-1 PC Bus Interface..............4-1 Communications..............4-1 Control Signals..............4-1 Dimensions................ 4-1 Connectors/Interface ............4-1 Appendix B: Connectors/Pinouts..........4-2 Cable Connector Pinouts ........... 4-2 Connector Box/Pinouts............4-5 Appendix C: Factory Settings………………………………….4-7 Echo...................

  • Page 71: Appendix A: Specifications

    Chapter 4: Appendix A - Specifications Appendix A: Specifications Operating Environment -60 ° C to 100 ° C Storage temperature: Operating temperature: 5 ° C to 65 ° C Relative humidity: 5 - 90% no condensing Air movement: no requirement Altitude: 15,000 feet (5000 metres) Power Requirements...

  • Page 72: Appendix B: Connectors/Pinouts

    Chapter 4: Appendix B Connectors/ Pinouts Appendix B: Connectors/Pinouts Appendix B outlines the pinouts for the following: Echo cable connector pinouts Echo external connector box pinouts Cable Connector Pinouts Table 5: DB-9 pinouts - Echo RS-232 RS-485 Pin No. Signal Signal RxD B(+) TxD B(+)

  • Page 73: Table 6: Echo Db-78 Pinouts

    Chapter 4: Appendix B – Connectors/Pinouts Table 6: Echo DB-78 pinouts Port RS-232 RS-485 Signal Signal RTS A(-) RTS B(+) Reserved CTS A(-) Reserved CTS B(+) RTS A(-) RTS B(+) Reserved CTS A(-) CTS B(+) RTS A(-) RTS B(+) Reserved CTS A(-) Reserved CTS B(+)

  • Page 74: Table 6(Continued): Echo Db-78 Pinouts

    Chapter 4: Appendix B Connectors/ Pinouts Table 6(continued): Echo DB-78 pinouts Port RS-232 RS-485 Signal Signal RTS A(-) RTS B(+) Reserved CTS A(-) Reserved CTS B(+) RTS A(-) RTS B(+) Reserved CTS A(-) CTS B(+) RTS A(-) RTS B(+) Reserved CTS A(-) Reserved CTS B(+)

  • Page 75: Connector Box/Pinouts

    Chapter 4: Appendix B: Connectors/Pinouts Connector Box /Pinouts You may order the Echo with an external I/O Box option. The I/O Box option comes with a metal bracket that can be mounted on a wall or other surface. When you receive the I/O Box, this bracket is clipped on to the back of the connector box.

  • Page 76: Table 7: Db-9 Pinouts - Echo I/O Box

    Chapter 4: Appendix B: Connectors/Pinouts Table 7: DB-9 pinouts - Echo I/O Box RS-232 RS-485 Pin No. Signal Signal RxD B(+) TxD B(+) TxD A(-) RxD A(-) Reserved CTS A(-) RTS A(-) RTS B(+) Reserved CTS B(+) Male DB-9 Connector Technical Tip: Please ensure that you terminate the DCD or CTS signals if your application does not use them.

  • Page 77: Appendix C: Factory Settings

    I/O Port Address Setting The DIP switches on switch block SW1 sets the I/O port addresses for the Echo adapter. Connect Tech ships the Echo adapter with SW1 set for: I/O port addresses 280, 288, 290, 298, 2A0, 2A8, 2B0, 2B8 hex; status port disabled; and all ports interrupting on channel A.

  • Page 78: Appendix D: Rs-422/485 Options

    Chapter 4: Appendix D: RS-422/485 Wiring Diagram Appendix D: RS-422/485 Options RS-422/485 Cable Wiring You can wire Echo adapters with the RS-422/485 option in various ways to communicate with RS-422/485 peripherals. This section will descibe a few examples of RS-422/485 cabling schemes.

  • Page 79: Figure 20: Rs-422/485 Wiring Diagram (2 Wire)

    Chapter 4: Appendix D - RS-422/485 Options Figure 20 describes a 2 wire cabling scheme between a port on the Echo adapter to a port on the RS-422/485 peripheral. Figure 20: RS-422/485 wiring diagram (2 wire) Echo adapter RS-485 peripheral TxD + RxD + TxD +...

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