Protocol; Message Format - Comtech EF Data XTRT-400C Operation And Installation Manual

Protocol

Message Format

Commands, Queries, and Responses are formatted as follows:
RS-485
Using RS-485, a master device can maintain status and control of
multiple devices, which share send/receive lines. Slaves may transmit
only in response to a command or query from the master. Each device is
assigned a unique address between 'A' and 'Z' to differentiate it from other
devices.
RS-485 device addresses are selected on rack HPAs using the front
panel interface. They are selected on digital outdoor HPAs using Xicom's
"HPA Control" utility.
MNC-0500-038
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Amplifier Communication and Protocol, XTRT, Touchscreen TWTA
Messages are delineated using start and stop characters, followed
•
by a check byte.
The address byte allows a master device to selectively
•
communicate with individual devices that are sharing an RS-485
bus.
Each message has a mandatory message byte, followed by a
•
variable number of parameters. Some messages have no
parameters, while others can have many. the variable length
parameter field is also used to hold message responses.
For Ethernet only. Each message must be terminated with a
•
carriage return character (CR) or carriage return line feed
character pair (CRLF).
If a device is not responding to your messages, check the
RS-485 device address.
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