Rockwell Automation 2755-DM9, -DM9E High Speed Decoder - Manual (Page 83)

A–B
6 Chapter
6–1
Communicating With a Host
This chapter provides a basic description of the decoder’s ability to
communicate with a host device. In addition, this chapter provides a
description of the:
•
Host communications port.
•
Communications cable required to connect your host device to the
decoder.
•
Format of the bar code data sent to a host.
•
Available communications standards and how they are used.
The HOST communications port on the back of the decoder provides for
communications with a host using the following standards:
•
RS-232
•
RS-422
•
RS-485
All three communications interfaces are provided in the same 25 pin D
connector. Figure 6.1 shows the pin numbers for the HOST port.
Note: We have provided connection diagrams for each interface in the
appropriate sections of this chapter.
The type of cable that you use to connect the decoder to a host will vary
depending upon the communication standard being used and the type of
connector on the host’s serial communications port. You should use the
connection diagrams provided in this chapter for the communications
standard you are using. Using these diagrams, you can determine your
requirements and create or purchase a host communications cable.
Note: Refer to Appendix E for a protocol selection table which lists all of the
host protocol options.
Chapter Objectives
Host Port