Comtech EF Data CSAT-5060 - Manual (Page 197)

A–1
Appendix A. REMOTE CONTROL
A.1 Overview
This document gives the protocol and message set for remote monitor and control of the CSAT-5060 C-Band Transceivers product family.
The electrical interface is either one of these:
• EIA-485 multi-drop bus, for the control of many devices
• EIA-232 connection, for the control of a single device
Data is transmitted in asynchronous serial form, using ASCII characters. Control and status data are transmitted in packets of variable
length in accordance with the structure and protocol defined in this document.
A.1.1 EIA-485
The EIA-485 interface is provided at the J5 COMM 19-pin circular connector. The interface is a 4-wire EIA-485 interface using the
pinout shown in Table A-1. Because a half-duplex communication protocol is used, the +Tx and +Rx as well as the –Tx and –Rx signals
can be tied together at the user end to support a 2-wire interface. The EIA-485 driver is only active during transmission and is Tri-Stated
when not in use.
Table A-1. EIA-485 Interface
Pin Signal Name I/O Notes
A EIA-485 +Rx Input CSAT Receive line
B EIA-485 –Rx Input CSAT Receive line complement
C EIA-485 +Tx Output CSAT Transmit line
D EIA-485 –Tx Output CSAT Transmit line complement
T Ground Passive