CB Series PC/104-Plus Multiport Serial Module User’s Manual www.moxa.com/product Fourth Edition, January 2008 © 2008 Moxa Inc., all rights reserved. Reproduction without permission is prohibited.
CB Series PC/104-Plus Multiport Serial Module User’s Manual The software described in this manual is furnished under a license agreement and may be used only in accordance with the terms of that agreement. Copyright Notice Copyright © 2008 Moxa Inc. All rights reserved. Reproduction without permission is prohibited. Trademarks MOXA is a registered trademark of Moxa Inc. All other trademarks or registered marks in this manual belong to their respective manufacturers.
Table of Contents Chapter 1 Introduction ...............................................................................................1-1 Overview .............................................................................................................................. 1-2 Package Checklist................................................................................................................. 1-2 Product Features ...............................................................................
Unloading the Driver .................................................................................................. 3-54 Windows CE 5.0................................................................................................................. 3-54 Installing the driver..................................................................................................... 3-54 Chapter 4 Serial Programming Tools........................................................................
1 Introduction Chapter 1 Welcome to the CB Series of PC/104-Plus communication modules, a multiport serial module for industrial applications. It is designed for PC/104-Plus CPU boards that accept the PC/104-Plus expansion interface. Optional DB9 and DB25 cables are available to connect different devices. The device drivers make full use of the 128-byte Tx/Rx FIFO and on-chip flow control, which allows up to 921.6 Kbps data transmission.
CB Series PC104 Plus User’s Manual Introduction Overview The CB Series PC/104-Plus module is designed to be used with PC/104-Plus CPU modules or CPU cards with the PC/104-Plus expansion interface. Models are available for RS-232, RS-422, and RS-485, with 4 or 8 ports. The serial ports are accessed through a 40-pin box header connector on the module. DIP switches allow you to select the serial interface. The industry-standard MOXA UART (16C550 compatible) is fully programmable.
CB Series PC104 Plus User’s Manual Introduction Product Specifications CB Series PC/104-Plus Multiport Serial Module Hardware I/O controller Connector Type Interface Bus No. of Ports Max. No.
2 Hardware Installation Chapter 2 This chapter explains how to install the CB Series PC/104-Plus multiport serial module.
CB Series PC104 Plus User’s Manual Hardware Installation Hardware Installation Installing the CB Series module is easy. Before inserting the module into the PC/104-Plus slot, you must first configure the I/O base address, interrupt vector, IRQ, and serial interface (for select models). ATTENTION Safety First! To prevent damage to your system or board, make sure your embedded PC’s power is turned off before installing your CB Series module.
CB Series PC104 Plus User’s Manual Hardware Installation CB-114 Rotary switch PC/104-Plus Slot SW1 SW2 Serial Interface SW3 Box Header Connector PC/104 Slot JP 1 JP 2 JP 3 JP 4 CB-134I Rotary Switch PC/104-Plus Slot RS422/485 2-wire/4-wire JP 1 JP 2 JP 3 JP 4 Box Header Connector PC/104 Slot Rotary Switch A rotary switch on the board makes it easy to set the appropriate signals, particularly when installing multiple PC/104-Plus modules in the same unit.
CB Series PC104 Plus User’s Manual Hardware Installation Serial Interface Selection For the CB-114 and CB-134I, the serial interface is selecting using the onboard DIP switches.
3 Software Installation Chapter 3 After installing the CB Series module in your embedded computer, the next step is installing the software. Drivers for various operating systems are provided, including DOS, Windows, and Linux. This chapter explains how to install and remove the CB Series driver.
CB Series PC104 Plus User’s Manual Software Installation Windows NT Installing the Driver You will need to plug the board in an available PCI or PCI-X slot first, before installing the driver. Note that these instructions use the CB-114 as an example. The procedure for installing all models is the same. 1. Log into Windows NT as Administrator. 2. Locate the appropriate folder for your board’s drivers on the Document & Software CD. The NT drivers will be located under the product folder in the \Software\Wi
CB Series PC104 Plus User’s Manual Software Installation 4. When prompted, select your board model (Smartio/Industio Family multiport board in this example) and click OK. 5. After the files have been installed, a configuration panel will open. This is where boards are installed, configured, and removed. If another board has already been installed on the system, it will already be listed. Windows NT does not automatically detect Moxa UPCI boards, so you will need to click Add for a newly installed board.
CB Series PC104 Plus User’s Manual Software Installation 7. The board will now appear in the configuration panel (CB-114 Series in this example). Click OK to return to the Network applet. After that, click OK again to exit the Network applet 8. Restart the PC. After you have logged back into Windows NT, you may check the event log issued by the Moxa driver to see if the board’s ports have been initialized successfully. In the Administrative group, open Event Viewer and select Log and System.
CB Series PC104 Plus User’s Manual Software Installation Configuring the Ports 1. In Windows Control Panel, open the Network applet. In the Adapters tab, UPCI boards will appear as a type of Moxa adapter (MOXA Smartio/Industio Family Adapter in this example). Select the Moxa adapter and click Properties…. 2. The configuration panel will open with a list of installed boards. Select your board and click Property. Up to 4 Moxa UPCI boards can be installed at a time.
CB Series PC104 Plus User’s Manual Software Installation 3. Select a port to configure and click Port Setting. Under Port Number, select a COM number to assign to the serial port. Select Auto Enumerating COM Number to map subsequent ports in numerical order. For example, if COM 3 is assigned to Port 1, then COM 4 will be automatically assigned to Port 2. 4. Select an Rx FIFO Trigger and Tx FIFO Size. The default Rx FIFO Trigger is 120 bytes (high level).
CB Series PC104 Plus User’s Manual Software Installation 5. Click OK to approve the settings for the selected port. Continue in the same way to configure the other ports. When you have finished setting up the ports, click OK to close the Properties window and apply the new port settings. Click OK again to exit the Network applet. Removing the Board To remove a board, shut of your PC and physically remove the board from the PCI slot.
CB Series PC104 Plus User’s Manual Software Installation 2. Restart the system. 3. Go through the process of installing the drivers using the new drivers. Removing the Driver 1. In Windows Control Panel, open the Network applet. In the Adapters tab, UPCI boards will appear as a type of Moxa adapter (MOXA Smartio/Industio Family Adapter in this example). Select the Moxa adapter and click Remove. 2. Click OK to exit the Network applet and restart the system.
CB Series PC104 Plus User’s Manual Software Installation Windows 95/98/ME Installing the Driver Windows 95 1. After the board is physically installed and the PC boots up, Windows will automatically detect the new board and the Found New Hardware Wizard window will open. Click Next to continue. 2.
CB Series PC104 Plus User’s Manual Software Installation 3. Click Browse and select the appropriate directory on the Document & Software CD for the driver. Drivers for all operating systems are located under the product folder in the \Software directory. Select the \Win9x folder and click OK to continue. 4. After Windows finds the drivers, click Finish. You may begin configuring and using the new COM ports right away without restarting Windows.
CB Series PC104 Plus User’s Manual Software Installation Windows 98 and ME 1. After the board is physically installed and the PC boots up, Windows will automatically detect the new board and the Found New Hardware Wizard window will open. Click Next to continue. 2. Select Display a list... and click Next.
CB Series PC104 Plus User’s Manual Software Installation 3. Select Other Devices and click Next. 4. Select Have Disk… 5. Click Browse and select the appropriate directory on the Document & Software CD for the driver. Drivers for all operating systems are located under the product folder in the \Software directory. Select the \Win9x folder and click OK to continue.
CB Series PC104 Plus User’s Manual Software Installation 6. After Windows installs the drivers, click Finish. Configuring the Ports You may configure the COM ports after the board and drivers have been installed. 1. In the Windows Control Panel, open the System applet.
CB Series PC104 Plus User’s Manual Software Installation 2. In the Device Manager tab, expand the Moxa Smartio/Industio multiport board category by clicking the “+” sign next to it. Select the desired board and click Properties. 3. On the Ports Configuration tab, select a port to configure and click Port Setting. Under Port Number, select a COM number to assign to the serial port. Select Auto Enumerating COM Number to map subsequent ports in numerical order.
CB Series PC104 Plus User’s Manual Software Installation 4. Select an Rx FIFO Trigger and Tx FIFO Size. The default Rx FIFO Trigger is 120 bytes (high level). The default Tx FIFO Size is 128 bytes (high level). Select Set the change to all ports to use this setting for all serial ports on the board. High Middle Low TxFIFO 128 64 1 RxFIFO 120 60 1 5. Click OK to approve the settings for the selected port. Continue in the same way to configure the other ports.
CB Series PC104 Plus User’s Manual Software Installation 2. In the Device Manager tab, expand the Moxa Smartio/Industio multiport board category by clicking the “+” sign next to it. Select the desired board and click Properties. 3. In the Driver tab, click Update Driver....
CB Series PC104 Plus User’s Manual Software Installation 4. Select the appropriate model (CP-168U in this example) and click Have Disk... 5. When prompted, select the appropriate directory on the Document & Software CD for the driver. Drivers for all operating systems are located under the product folder in the \Software directory. Select the \Win9x folder and click OK to continue. 6. You will be prompted to restart the system. The new drivers will be in effect the next time you restart.
CB Series PC104 Plus User’s Manual Software Installation 2. When prompted, click Yes to confirm that you want to remove the driver. 3. After the driver has been removed, click OK to return to the Add/Remove Programs applet. Windows Vista (32-bit and 64-bit) The Windows Vista (32-bit/64-bit) drivers conform to the Win32 COMM API standard and support all models in the CB Series. In the following instructions, the CB-114 is used as an example. Installing the Driver 1.
CB Series PC104 Plus User’s Manual Software Installation 3. When prompted to insert the disc, select I don’t have the disc. Show me other options. 4. Select Browse my computer for drier software (advanced).
CB Series PC104 Plus User’s Manual Software Installation 5. Click Browse to manually specify the folder in which to find the driver. For 32-bit (x86) platforms, select the \CB Series\Software\Windows Vista\x86 folder on the CD. For 64-bit (x64) platforms, select the \CB Series\Software\Windows Vista\x64 folder on the CD. Click Next to continue.
CB Series PC104 Plus User’s Manual Software Installation 6. If you see a warning that the software has not passed Windows Logo testing, click Install this driver software anyway. 7. After the files have been installed, click Close.
CB Series PC104 Plus User’s Manual Software Installation 8. After the module is installed, you will be prompted to install the new serial ports. A Found New Hardware Wizard window will open for the first serial port, port 0. Select Locate and install driver software (recommended) to continue. 9. Select I don’t have the disc. Show me other options.
CB Series PC104 Plus User’s Manual Software Installation 10. Select Browse my computer for driver software (advanced). 11. Click Browse to manually specify the folder in which to find the driver. For 32-bit (x86) platforms, select the \CB Series\Software\Windows Vista\x86 folder on the CD. For 64-bit (x64) platforms, select the \CB Series\Software\Windows Vista\x64 folder on the CD. Click Next to continue. 12. Windows will install the driver software.
CB Series PC104 Plus User’s Manual Software Installation 13. If you see a warning that the software has not passed Windows Logo testing, click Install this driver software anyway. 14. After the files have been installed, click Close. The remaining serial ports will automatically install in the background.
CB Series PC104 Plus User’s Manual Software Installation Using Device Manager to Verify Installation You can use Windows Device Manager to verify proper installation of the CB Series module. In the following instructions, the CB-114 is used as an example. 1. Under My Computer, click System Properties. 2. In the System window, click Device Manager.
CB Series PC104 Plus User’s Manual Software Installation 3. In the Device Manager window, you should see your CB Series module under Multi-port serial adapters. You should also see Moxa communication ports under Ports (COM & LPT). 4. If you see any special marks, such as a question mark or an exclamation mark, next to the Moxa items, the installation of your module or serial ports was not successful. Examine the Windows event log for details.
CB Series PC104 Plus User’s Manual Software Installation 2. Under Port Number, select a COM number to assign to the serial port. Select Auto Enumerating COM Number to map subsequent ports in numerical order. For example, if COM 3 is assigned to Port 1, then COM 4 will be automatically assigned to Port 2. Tx FIFO Rx FIFO High 128 bytes 120 bytes Middle 64 bytes 60 bytes Low 1 byte 1 byte Select an Rx FIFO Trigger. The default value is 120 bytes (high level).
CB Series PC104 Plus User’s Manual Software Installation 3. Click OK to approve the port settings. Click OK again to close the CB Series Properties window and apply the new port settings. Windows XP, 2003 (32-bit and 64-bit) The Windows XP and 2003 (32-bit and 64-bit) drivers conform to the Win32 COMM API standard and support all models in the CB Series. In the following instructions, the CB-114 is used as an example. Installing the Driver 1.
CB Series PC104 Plus User’s Manual Software Installation 4. Click Browse to manually specify the folder in which to find the driver. For 32-bit (x86) platforms, select the \CB Series\Software\Windows XP_2003\x86 folder on the CD. For 64-bit (x64) platforms, select the \CB Series\Software\Windows XP_2003\x64 folder on the CD. Click Next to continue. 5. If you see a warning that the software has not passed Windows Logo testing, click Continue Anyway.
CB Series PC104 Plus User’s Manual Software Installation 6. Windows will install the drivers. When the installation is complete, click Finish. 7. After the module is installed, you will be prompted to install the new serial ports. A Found New Hardware Wizard window will open for the first serial port, port 0. Select No, not this time and click Next.
CB Series PC104 Plus User’s Manual Software Installation 8. Select Install from a list or specific location (Advanced) and click Next. 9. Select Search for the best driver in these locations and Include this location in the search. For 32-bit (x86) platforms, select the \CB Series\Software\Windows XP_2003\x86 folder on the CD. For 64-bit (x64) platforms, select the \CB Series\Software\Windows XP_2003\x64 folder on the CD. Click Next to continue.
CB Series PC104 Plus User’s Manual Software Installation 10. If you see a warning that the software has not passed Windows Logo testing, click Continue Anyway. 11. Windows will install the necessary drivers.
CB Series PC104 Plus User’s Manual Software Installation 12. After the installation is complete, click Finish. 13. Repeat the installation process for the remaining serial ports.
CB Series PC104 Plus User’s Manual Software Installation Using Device Manager to Verify Installation You can use Windows Device Manager to verify proper installation of the CB Series module. In the following instructions, the CB-114 is used as an example. 1. Right-click My Computer and select Properties in the context menu. 2. In the Hardware tab, click Device Manager.
CB Series PC104 Plus User’s Manual Software Installation 3. In the Device Manager window, you should see your CB Series module under Multi-port serial adapters. You should also see Moxa communication ports under Ports (COM & LPT). 4. If you see any special marks, such as a question mark or an exclamation mark, next to the Moxa items, the installation of your module or serial ports was not successful. Examine the Windows event log for details.
CB Series PC104 Plus User’s Manual Software Installation 2. Under Port Number, select a COM number to assign to the serial port. Select Auto Enumerating COM Number to map subsequent ports in numerical order. For example, if COM 3 is assigned to Port 1, then COM 4 will be automatically assigned to Port 2. Tx FIFO Rx FIFO High 128 bytes 120 bytes Middle 64 bytes 60 bytes Low 1 byte 1 byte Select an Rx FIFO Trigger. The default value is 120 bytes (high level).
CB Series PC104 Plus User’s Manual Software Installation Using PComm PComm Diagnostic is a useful program for checking the module’s status. It provides internal and external testing of IRQ, TxD/RxD, UART, CTS/RTS, DTR/DSR, and other items. You can use PComm Diagnostic to verify that the module and serial ports are working properly. You can download the free version of PComm at Moxa’s website (www.moxa.com). Using Event Log You may refer to the Windows event log to verify operation of the module.
CB Series PC104 Plus User’s Manual Software Installation 3. In Device Manager, right-click your module under Multi-port serial adapters and select Disable in the context menu. This will disable the module. Uninstalling the Module 1. Right-click My Computer and select Properties in the context menu. 2. In the Hardware tab, click Device Manager.
CB Series PC104 Plus User’s Manual Software Installation 3. Right-click your module under Multi-port serial adapters and select Uninstall in the context menu. 4. A confirmation dialog will appear. Click OK to uninstall the device. Windows 2000 The Windows 2000 drivers conform to the Win32 COMM API standard and support all models in the CB Series. In the following instructions, the CB-114 is used as an example. Installing the Driver 1.
CB Series PC104 Plus User’s Manual Software Installation 3. Select Search for a suitable driver for my device (recommended) and click Next to continue. 4. Select Specify a location and click Next to continue.
CB Series PC104 Plus User’s Manual Software Installation 5. Click Browse to manually specify the folder in which to find the driver. Select the \CB Series\Software\Windows 2K folder on the CD and click Next to continue. 6. To begin installing the module, click Next. 7. If you see a warning that the Microsoft digital signature was not found, click Yes to proceed with the installation.
CB Series PC104 Plus User’s Manual Software Installation 8. Windows will install the drivers. When the installation is complete, click Finish. 9. After the module is installed, you will be prompted to install the new serial ports. A Found New Hardware Wizard window will open for the first serial port, port 0. Click Next to proceed.
CB Series PC104 Plus User’s Manual Software Installation 10. Select Search for a suitable driver for my device [recommended] and click Next. 11. Select Specify a location and click Next. 12. Select the \CB Series\Software\Windows 2K folder on the CD and click Next.
CB Series PC104 Plus User’s Manual Software Installation 13. When the driver has been found, click Next to proceed. 14. Windows will install the necessary drivers. After the installation is complete, click Finish. The remaining serial ports will be installed automatically in the background.
CB Series PC104 Plus User’s Manual Software Installation Using Device Manager to Verify Installation You can use Windows Device Manager to verify proper installation of the CB Series module. In the following instructions, the CB-114 is used as an example. 1. Right-click My Computer and select Properties in the context menu. 2. In the Hardware tab, click Device Manager. 3. In the Device Manager window, you should see your CB Series module under Multi-port serial adapters.
CB Series PC104 Plus User’s Manual Software Installation 4. If you see any special marks, such as a question mark or an exclamation mark, next to the Moxa items, the installation of your module or serial ports was not successful. You can check the Windows event log for details. Port Configuration After the driver is installed, a CB Series Properties window will appear. The system will map the serial ports automatically.
CB Series PC104 Plus User’s Manual Software Installation 2. Under Port Number, select a COM number to assign to the serial port. Select Auto Enumerating COM Number to map subsequent ports in numerical order. For example, if COM 3 is assigned to Port 1, then COM 4 will be automatically assigned to Port 2. Tx FIFO Rx FIFO High 128 bytes 120 bytes Middle 64 bytes 60 bytes Low 1 byte 1 byte Select an Rx FIFO Trigger. The default value is 120 bytes (high level).
CB Series PC104 Plus User’s Manual Software Installation The free version of PComm is available at Moxa’s website (www.moxa.com). Using Event Log You may refer to the Windows event log to verify operation of the module. To view the event log, open Event Viewer, which is located under Administrative Tools in the Control Panel. Information about the module will be located under the System category. Disabling the Module 1. Right-click My Computer and select Properties in the context menu. 2.
CB Series PC104 Plus User’s Manual Software Installation 3. In Device Manager, right-click your module under Multi-port serial adapters and select Disable in the context menu. This will disable the module. Uninstalling the Module 1. Right-click My Computer and select Properties in the context menu. 2. In the Hardware tab, click Device Manager.
CB Series PC104 Plus User’s Manual Software Installation 3. Right-click your module under Multi-port serial adapters and select Uninstall in the context menu. 4. A confirmation dialog will appear. Click OK to uninstall the device.
CB Series PC104 Plus User’s Manual Software Installation Linux (32-bit and 64-bit) Execute the following commands from the Linux prompt: #mount /dev/cdrom /mnt/cdrom #cd / #mkdir moxa #cd moxa #cp /mnt/cdrom//mxser.tgz . #tar xvfz mxser.tgz #cd mxser # make clean; make install #cd /moxa/mxser/driver #./msmknod #modprobe mxser You can use the Moxa diagnostic utility to verify the driver status: #cd /moxa/mxser/utility/diag #.
CB Series PC104 Plus User’s Manual Software Installation After installation is complete, you will be prompted to set up the board and driver initial values. We strongly recommended that you do so. Driver Setup The following instructions are not intended to illustrate every function of the setup program. For more detailed information, please refer to the help files by pressing F1 in the setup program. 1. Run the setup program, BIN\SETUP.EXE. 2. Select your CB Series model and press Enter. 3.
CB Series PC104 Plus User’s Manual Software Installation Port number: This is the port ID of each port. Application software will refer to a port by its port number (ID). Port numbers must be unique; duplicate port numbers are not allowed. The port ID can range from 0 to 127 as long as it does not overlap with another port. Generally, you should consider the convenience of programming when specifying the port number.
CB Series PC104 Plus User’s Manual Software Installation Loading the Driver After setting up the driver, you must load the driver in order to gain access to the serial ports on the module. Run BIN\DPC-DRV.EXE at the DOS prompt. The driver will detect your CB Series module automatically. You should see messages indicating successful detection of your module, such as the following: Smartio/Industio Family DOS driver Version 1.8 Setup driver … CB-114 series (Bus=x, Dev=y) : OK! Device driver setup O.K.
CB Series PC104 Plus User’s Manual Software Installation 2. Start WinCE Platform Builder, select File, and open New Platform. 3. Enter a Name for Workspace and press Next.
CB Series PC104 Plus User’s Manual Software Installation 4. When you see Board Support Packages, Design Template, Applications & Media, Networking & Communications, OBEX Server, select what you need to build your own environment. The Completing the New Platform Wizard window will open to indicate that it has finished creating a new platform. Click Finish to complete the setup.
CB Series PC104 Plus User’s Manual Software Installation 3-57
CB Series PC104 Plus User’s Manual Software Installation 5. Open Manage Catalog Items (File Æ Manage Catalog Items). In the Catalog (View Æ Catalog), browse to \Third Party\Device Drivers\ MOXA Smartio/Industio-PCI, PC/104-Plus. Right-click on the driver Prefix COM or Prefix MXU you would like to include and choose Add to OS Design. Note: You can only select either Prefix COM or Prefix MXU, but not both. Prefix COM supports up to 10 ports, from COM0 to COM9.
CB Series PC104 Plus User’s Manual Software Installation 6. After adding Moxa Tech drivers into your OS Design, a new project is automatically added to your workspace. The project name is mxserce5. The project can be accessed from File View (View Æ File View). The mxserce5 project contains a number of files used to configure the drivers included in your OS Design. Note: If you would like to use “Terminal Emulator” tool, please modify mxserce5.
CB Series PC104 Plus User’s Manual Software Installation 8. Finally, copy your image file to the target Host. Note: If you have created a Windows CE Platform Builder in the development environment, you can skip steps 2, 3, and 4.
4 Serial Programming Tools Chapter 4 Moxa provides Windows serial programming libraries and troubleshooting utilities that are easy to use and powerful. You can use these tools to reduce software development time. The serial communication library is useful for developing applications for data communications, remote access, data acquisition, and industrial control. It provides a simpler solution compared to the more complex Windows Win32 COMM API.
CB Series PC104 Plus User’s Manual Serial Programming Tools Serial Programming Library The serial programming library assists you in developing serial communications programs for any COM port that complies with the Microsoft Win32 API. It facilitates the implementation of multi-process and multi-thread serial communication programs and can remarkably reduce development time. The library provides a complete set of functions as well as various sample programs for Visual C++, Visual Basic, and Delphi.
CB Series PC104 Plus User’s Manual Serial Programming Tools PComm Monitor PComm Monitor is designed for Moxa board in Windows NT only. It allows you to monitor data transmission of selected MOXA COM ports. It monitors data transmission, throughput, and line status at regular intervals. Click on a specific port to view that port’s communication parameters and status. To run PComm Monitor, go to Start Æ Program Æ PComm Lite Æ Monitor.
CB Series PC104 Plus User’s Manual Serial Programming Tools 4-4
5 Pin Assignments Chapter 5 The box header connector(s) on the module is used to connect to serial devices. Optional cables are available that provide DB9 or DB25 connectors. The pin assignments of the box header connectors and available cables are provided below. Box Header Pin Assignments RS-232 These pin assignments apply to the CB-108 and CB-114. Note that there are two 40-pin box header connectors on the CB-108, each of which connects to 4 serial ports.
CB Series PC104 Plus User’s Manual Pin Assignments 2-wire RS-485 These pin assignments apply to the CB-114 and CB134I.
CB Series PC104 Plus User’s Manual Pin Assignments DB25(M) Connectors 1 13 14 25 The CBL-F40M25x4-50 and CBL-F20M25x4-50 cables provide DB25 (M) connectors for each serial port, with pin assignments as follows: Pin RS-232 RS-422 4-wire RS-485 2-wire RS-485 2 TxD RxD+(B) Data+(B) 3 RxD TxD+(B) --- 4 RTS --- --- 5 CTS --- --- 6 DSR --- --- 7 GND GND GND 8 DCD TxD-(A) --- 20 DTR RxD-(A) Data-(A) 5-3
