Rockwell Automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User Manual - Manual (Page 109)

Chapter 7
7-1
Using the Serial Ports
This chapter provides information for setting up communication with the
serial ports on both the control coprocessor main module and the serial
expander module.
For information on: See page:
Setting up communication
parameters
7Ć2
Referencing OSĆ9 serial port
device names
7Ć4
Connecting to the serial port 7Ć4
Using a serial port for ASCII
communication
7Ć5
Using a serial port for
RSĆ485 communication
7Ć10
Using a serial port for
RSĆ422 communication
7Ć17
You can use the serial ports to connect to a device that sends and receives
ASCII and other serial communication.
With Series A Revision D (1.20) and later of the firmware, the serial port
drivers include Data Carrier Detect functions (
_ss_dcon and _ss_dcoff )
and they also support RS-485 communications. The serial port on the
expander module (1771-DXPS) handles reception of 7-bit even-parity
communications. For more information about these functions, see the
OS-9 C Language User Manual, publication 1771-6.5.104.
The serial port buffers also increased with Series A Revision D (1.20)
of the firmware. The input buffers on the coprocessor and the expander
increased from 80 to 128 bytes. The output buffers on the coprocessor
increased from 140 to 256 bytes. The output buffers were already 256
bytes on the expander. These buffers are fixed, and they cannot be
modified through user programs.
You use the PCBridge software to set up communication parameters for
your personal computer. See Chapter 3.
Chapter Objectives
Introduction
Installing the Control
Coprocessor
Getting Started with the
Control Coprocessor
Using the Programming
Environment
Developing Programs
Interpreting Fault
Codes and Displays
Using the Ethernet
Interface
Using the Serial Ports