Rockwell Automation 2755 Enhanced Decoder Series B - Manual (Page 320)

Connecting to a Host E–2
Publication 2755-833
Appendix F lists the host protocol options for each communication
interface.
Figure E.1 shows how to connect the NEMA Type 1 decoder to a
host using RS-232. Use a Belden 8303 cable, Alpha 45123 cable, or
equivalent.
Figure E.1 Connecting NEMA Type 1 Decoder to Host using
RS-232
SIG GND➂
RTS
1
2
3
4
5
7
20
GND
TD➂
RD➂
CTS
DTR
RD
TD
CTS
RTS
DSR
Host Port
25-pin DB Connector
on Decoder➀
Host RS-232 Port
*
*
*
*
*
*
* Pin designations depend
on host device.
Shield➁
➀ DTE = Data Terminal Equipment
➁ When nonmetallic connecter shell used.
(If metal connector, connect shield to shell).
➂ Pins 2, 3, and 7 are the minimum connections.
All unused pins should be left open.
6 DSR DTR *
SIG GND
Pins 4, 5, and 20 are optional flow control lines. Flow control
options are:
•
RS-232
No flow control.
•
RS-232 XON/XOFF
The XOFF character from the host suspends transmission and the
XON character resumes transmission. The receiving device
removes the XON/XOFF characters from the message.
•
RS-232 RTS/CTS-1
Enables the RS-232 (RTS and CTS) control lines for flow control.
•
RS-232 RTS/CTS-2
Enables the RS-232 (RTS and CTS) control lines for flow control.
Use this mode of flow control to communicate with Catalog No.
2760-RA or -RB module.
The RS-232 interface and flow control are selected on the Host
Communications configuration screen.
RS-232 Interface