Comtech EF Data RSU-503 - Manual (Page 2)

Filename: T_ERRATA 1
Errata A
Comtech EFData Documentation Update
Subject: Changes to Chapter 3 (Communications Link Jumper Setting)
Date: July 28, 1997
Document: RSU-503 Redundancy Switch Unit Installation and Operation
Manual, Rev. 8, dated April 4, 1997
Part Number: MN/RSU503.EA8
Collating Instructions: Attach this page to page 3-1
Comments:
The following changes provide the correct information for jumper placement when choosing
between RS-232 or -485. This information will be incorporated into the next revision.
Change Specifics:
3.4.1 Communications Link
The terminal functions can be remotely controlled and monitored via an RS-485 or RS-232
communications link.
•
The RS-485 interface makes it possible to operate 255 terminals on a common communications
link.
•
The RS-232 interface is used to communicate with a single terminal.
The M&C module must be hardware configured on the M&C board to one of the two interfaces. Refer to
the following table for jumper placement at JP1:
RS-485
Configuration
RS-232
Configuration
1-2 9-10
3-4 11-12
5-6 13-14
7-8 15-16