Rockwell Automation 1734-485ASC POINT I/O ASCII User Manual - Manual (Page 19)

Publication 1734-UM009B-EN-P - July 2003
Installing the ASCII Module 1-9
5. The ASCII module produces and consumes the number of ASCII
characters selected plus four.
These produce and consume sizes are presented for your
information in parameters 13 and 23, respectively.
How to Read Serial Device
Input Data from the
ASCII Module 1. Connect to the ASCII module from your configuration tool.
2. Connect the serial side of the ASCII module to your computer’s
serial port or another serial device.
3. Go to the device configuration screen in the configuration tool.
4. Make sure that the ASCII module is in the default factory
configuration.
5. Set the baud rate and framing format of the serial port to the
baud rate and framing format of the serial device that you are
using.
6. Put the configuration tool in monitor mode.
7. Direct the device that you are communicating with to send data.
For example, if you are connected to a computer terminal
program, type a message into the terminal. When you hit enter,
the module will update the data with the message that you
typed, and increment the transaction ID.
The default assembly of the poll response message is shown
below.
TIP
Make sure that you set up your scanner to the
correct sizes using this data.
Table 1.2 Default Receive Data Assembly Format (Default Mode)
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5-23 Byte 24
RX Transaction ID
Byte
Status Byte Reserved Length ASCII Data <CR>
(Terminator)