Comtech EF Data CD-MNLBC4000, Инструкция по установке и эксплуатации

Страница: 125 / 166

LBC-4000 L-Band Up/Down Converter System MN/LBC4000.IOM
Serial Interface Operation Revision 5
8–3
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): <0412/MUT_A_ON{cr}
Query Example (Controller-to-Target): <0412/MUT_A{cr}
Query Response Example (Target-to-Controller): >0412/MUT_A_ON{CR}{LF}
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.