Rockwell Automation 5370 CVIM Communications Manual - Manual (Page 71)

A–B
5
Chapter
5–1
Using the RS-232 Ports
In this chapter we describe how to:
•
Connect RS–232 device(s) to the CVIM module.
•
Obtain results data using ASCII or DF1 protocols.
•
Upload and download configurations.
In addition, this chapter provides example programs.
Using the RS–232 interface you can link a variety of devices to the CVIM
module:
•
Computers
•
Operator Interfaces such as Allen–Bradley Industrial Computers and
Terminals with serial ports.
•
I/O modules such as the Basic Module (Catalog No. 1771–DB) or ASCII
module (Catalog No. 1771–DA).
•
Allen-Bradley DATAMYTE and Dataliner devices (requires USER-PAK
Software, Catalog No. 5370-UPK).
All commands are simple ASCII and/or Hexadecimal strings. Refer to
Appendix E for an ASCII conversion chart. These commands can be
generated using a variety of programming languages (C, Fortran, BASIC).
This chapter provides a sample ASCII program (written in BASIC) and a
sample DF1 program (written in C).
There are two protocol options when you select an RS–232 communications
port (A or B):
•
ASCII
•
DF1
This chapter describes both of these options. First we describe the ASCII
protocol (page 5–5) and then the DF1 protocol (page 5–29).
Chapter Objectives
RS–232 Communications
ASCII and DF1 Protocols