Instruction Manual

265Publication 1753-UM001C-EN-P - March 2010 265

Chapter

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