Rockwell Automation 1755-OF8 GuardPLC Controller Systems - Manual (Page 265)

265 Publication 1753-UM001C-EN-P - March 2010 265
Chapter
21
Communicate with ASCII Devices
Introduction
Connect the Controller to an
ASCII Device For the sole purpose of sending the status of the signals from the
GuardPLC controller to an external device, you can connect an
intelligent ASCII device to the GuardPLC controller’s serial port. This
ASCII connection is one-way from the GuardPLC controller (slave) to
the master device. You cannot program the GuardPLC controller or
change the values in the GuardPLC controller by using this port.
To use the ASCII function, signals that you wish to send out the serial
port must be connected to placeholders in the ASCII-protocol Connect
Signals dialog box. These signals are then capable of being sent out
the serial port if a command string is properly received from the
master. The command string includes a starting address and number
of signals to be sent. The GuardPLC controller replies to this
command string by sending the values of these signals out the serial
port in an ASCII string.
Connect to a GuardPLC 1200 Controller
Use a 1761-CBL-PM02 series C cable to connect to the serial port. The
mini-DIN connector attaches to the controller. The other end is a 9-pin
Topic Page
Connect the Controller to an ASCII Device 265
Configure the ASCII Serial Port 268
Connect Signals 269
ASCII Protocol 270
PLC
1200
RS-232
ASCII
serial port