Remote Commands And Queries Overview; Packet Structure; Start Of Packet Character; Target (Device) Address - Comtech EF Data MN/LBC4000.IOM Installation And Operation Manual

LBC-4000 L-Band Up/Down Converter System
Serial Interface Operation
8.1.3

EIA-232

With this simpler configuration, the Controller device is connected directly to the
Target via a two-wire-plus-ground connection. Controller-to-Target data is
carried, via EIA-232 electrical levels, on one conductor, while the Target-to-
Controller data is carried on the other conductor.

8.2 Remote Commands and Queries Overview

8.2.1

Packet Structure

The structure of a Command, Response, or Error Message is as follows:

• Start of Packet Character

• Target (Device) Address

• Address Delimiter
• Instruction Code
• Instruction Code Qualifier
• Optional Message Argument
• End of Packet
Command Example (Controller-to-Target):
Query Example (Controller-to-Target):
Query Response Example (Target-to-Controller):
8.2.1.1 Start of Packet Character
The Start of Packet Character begins each message:
• Controller-to-Target: '<' (ASCII code 60) designates the start of a user
command or query.
• Target-to-Controller: '>' (ASCII code 62) designates the start of a Target
response.
8.2.1.2 Target (Device) Address
Use the "SPA" remote command to assign an address to a Target unit. Up to
9,999 devices can be uniquely addressed.
<0412/MUT_A_ON{cr}
<0412/MUT_A{cr}
>0412/MUT_A_ON{CR}{LF}
8–3
MN/LBC4000.IOM
Revision 5