Ascii Modules; Cable Pinouts For Standard Db Connectors; Install A Serial Network; Read Serial Device Input Data From The Ascii Module - Rockwell Automation Allen-Bradley 1734-232ASC Original Instructions Manual

Chapter 1 Overview of the POINT I/O ASCII Modules
Cable Pinouts for
Standard DB Connectors

Install a Serial Network

Read Serial Device Input
Data from the ASCII Module
8
Component Description (Continued)
Description
2 Slide-in writable Label
3 RTB removing handle
4 Removable Terminal Block (RTB)
5 Mounting base
Table 1 shows how to connect cable pinouts for standard DB connectors.
Table 1 - ASCII Functions
Function
Transmit Data (TXD)
Receive Data (RXD)
Signal Ground (SG)
The communication between your serial devices and the:
• 1734-232ASC is an RS-232 3-wire network.
• 1734-485ASC is an RS-485 2-wire network or RS-422 4-wire network.
1. Connect an appropriate cable to your device.
2. Connect the other end of the cable to the ASCII module using the
designated positions on the 1734-TB terminal block.
Notice the terminal markings on the ASCII module case.
3. Turn on power to the serial device and the ASCII module.
4. Configure the ASCII buffer sizes on the ASCII module.
The defaults are 20 and 20. If more than 20 bytes are required for the transmit
or receive buffers, set the appropriate parameters. See
ASCII Modules into ControlLogix on page 38
ControlLogix Through the ASCII Modules on page
1. Add the ASCII module to a Studio 5000 Logix Designer application
project, see Create a New Module on page
2. Connect the serial side of the ASCII module to your computer's serial
port or another serial device.
3. From the Module Information dialog box, check the module information.
4. Make sure that the ASCII module is in the default factory configuration.
5. Set the communication rate and framing format of the serial port to the
communication rate and framing format of the serial device that you are
using.
6. Put the controller in Run mode.
7. Direct the device that you are communicating with to send data.
You can see the data sent from the device in the controller tag. See
Data from the ASCII Modules into ControlLogix on page
The default assembly of the poll response message is shown in
Rockwell Automation Publication 1734-UM009C-EN-P - August 2022
Description
7 DIN rail locking screw (orange)
8 Mechanical keying (orange)
9 Module wiring diagram
10 Insertable I/O module
Pin Number
DB-25 DB-9
2 3
3 2
7 5
and
Read Data from the
Transmit Data from
39.
15.
Read
38.
Table 2.