Address Delimiter; Instruction Code; Instruction Code Qualifier - Comtech EF Data MN/LBC4000.IOM Installation And Operation Manual

LBC-4000 L-Band Up/Down Converter System
Serial Interface Operation
Typical for EIA-232 or EIA-485 applications, the permissible range of values is
from 0001 to 9999. Each block converter module has its own address:
Module
LBC-4000
Block Converter A
Block Converter B
If several devices share an EIA-485 bus, note that the LBC-4000 requires three
addresses, and the device numbering should be spaced accordingly.
The Controller sends a packet with the address of a Target – the
destination of the packet. When the Target responds, the address used
is the same address, to indicate to the Controller the source of the
packet. The Controller does not have its own address.

8.2.1.3 Address Delimiter

This is the forward slash character '/' (ASCII code 47).

8.2.1.4 Instruction Code

Upper and lower case alphabetic characters may be used (A-Z, and a-z).
This three-character alphabetic string, whenever possible, references the subject
command or query. This aids in the readability of the message, should it be
displayed in its raw ASCII form.

8.2.1.5 Instruction Code Qualifier

The Instruction Code Qualifier is the underscore '_' (ASCII code 95). This single
character further qualifies the preceding instruction code. The Instruction Code
Qualifier obeys these rules:
1. From Controller-to-Target, the underscore '_' plus additional
parameter(s) comprise the assignment operator. This combination
Address
Base
Base + 1
Base + 2
8–4
MN/LBC4000.IOM
Revision 5