Appendix B. Remote Control; Overview; Eia-232; Basic Protocol - Comtech EF Data CDD-880 Installation And Operation Manual

Multi receiver router

Table of Contents

B.1

This appendix describes the protocol and message command set for remote monitor and control (M&C) of the CDD-880 Multi Receiver

Router.

The electrical interface is an EIA-232 connection (for the control of a single device), and data is transmitted in asynchronous serial form,

using ASCII characters. Control and status information is transmitted in packets of variable length in accordance with the structure and

protocol defined in later sections.

B.2

This is a configuration in which the 'Controller' device – assumed to be a PC or ASCII dumb terminal – is connected directly to the

'Target' device (i.e., the CDD-880 and its CONSOLE serial port) via a two wire-plus-ground connection. Controller-to-Target data is

carried via EIA-232 electrical levels on one conductor, and Target-to-Controller data is carried in the other direction on the other

conductor.

B.3

All data is transmitted in framed packets as asynchronous serial characters, suitable for transmission and reception to the Controller using

a universal asynchronous receiver/transmitter (UART). The character format should be 8N1 (eight data bits, no parity, one stop bit). The

baud rate is fixed at 38400 baud. Port flow control should be set to None.

Appendix B. REMOTE CONTROL

B–1

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