Rockwell Automation 1755-OF8 GuardPLC Controller Systems - Manual (Page 268)

268 Publication 1753-UM001C-EN-P - March 2010
Chapter 21 Communicate with ASCII Devices
Configure the ASCII Serial
Port You must either create a new project or open an existing project
before you can configure ASCII communication. Once the software
opens a project, it automatically displays the Hardware Management
window, from which you configure the ASCII port.
1. Right-click Protocols and choose New>ASCII.
2. Right-click the ASCII icon and choose Properties.
For this field Specify
Slave Address the slave address (1…65535) of the controller. The ASCII protocol of the controller supports only a
direct point-to-point connection between the master and slave.
The controller is always configured as slave. It only transfers process values via the serial interface
to the master when it receives the corresponding request from the master.
Refresh Rate the refresh rate in milliseconds for non-safe communication between the COM and CPU.
The default is 0, the fastest refresh rate.
Interface the field bus interface to be used by the ASCII protocol (comm1, comm2, comm3).
Choose comm3 for GuardPLC 1600 or 1800 controllers.
Baud Rate
(1) the data transfer speed in bits/s. Choose from a pull-down menu of predefined values between 300
and 115,200 bps. The default baud rate is 9600 bps.
Parity the parity for the recognition of transfer errors. Choose No, Odd, or Even. The default is No parity.
Stop Bit either 1 or 2 stop bits for the serial data transfer. The default is 1 stop bit.
(1) Even if the baud rate is changed from 9600, the power-up string is always sent out at 9600 baud.