Comtech EF Data CPA - Manual (Page 104)

CPA C-Band Solid State Power Amplifier Revision 1
Serial-based Remote Product Management MN/CPA-IN.IOM
7–4
7.4.2 Target Address
Up to 9,999 devices can be uniquely addressed. In EIA-485 applications, the permissible range of values is 1 to 9999. It is programmed
into a target unit using the remote control port.
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.
7.4.3 Address Delimiter
This is the “forward slash” character '/ ' (ASCII code 47).
7.4.4 Instruction Code
This is a three-character alphabetic sequence that identifies the subject of the message. Wherever possible, the instruction codes have
been chosen to have some significance. This aids in the readability of the message if seen in its raw ASCII form. Both upper and lower
case alphabetic characters may be used (A-Z ASCII codes 65-90 and a-z ASCII codes 97-122).
7.4.5 Instruction Code Qualifier
This is a single character, which further qualifies the preceding instruction code. Code Qualifiers obey the following rules:
1. From Controller-to-Target, the only permitted values are:
Symbol Definition
=
(ASCII code 61)
The = code is used as the assignment operator, and is used to indicate that the parameter defined by the preceding byte should be set
to the value of the argument(s) that follow it.
Example: In a message from Controller to Target, MUT=1 would mean ‘enable the mute function.’
?
(ASCII code 63)
The ? (ASCII code 63) is used as the query operator, and i s used to indicate that the Target should return the current value of the
parameter defined by the preceding byte.
Example: In a message from Controller to Target, MUT? would mean ‘return the current state of the mute function.’