Comtech EF Data LPOD - Manual (Page 108)

LPOD C-, X-, or Ku-Band Outdoor Amplifier / Block Up Converter (BUC) MN-LPOD
Serial-based Remote Product Management Revision 10
5–8
5.1.4.4 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.
For Example: GAC for Global Amplifier Configuration; IPA for IP Address, etc. This aids in the readability of the message, should it be
displayed in its raw ASCII form.
Both upper case and lower case alphabetic characters may be used (A-Z and a-z, ASCII codes 65-90 and 97-122).
5.1.4.5 Instruction Code Qualifier
This single character further qualifies the preceding instruction code. Code Qualifiers obey the following rules:
1) From Controller-to-Target, the only permitted values are:
=
(ASCII code 61 This character 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. For Example: In a message from Controller-to-Target, MUT=1 would mean ‘enable the
Mute function’.
?
(ASCII code 63) This character is used as the query operator, and is used to indicate that the Target should return the current value of the parameter
defined by the preceding byte. For Example: In a message from Controller-to-Target, SWR? would mean ‘returns the value of the internal
software revision installed in the unit’.
2) From Target-to-Controller, the only permitted values are:
=
(ASCII code 61) This character is used in two ways:
First, if the Controller has sent a query code to a Target (for Example: MUT?, meaning ‘is the Mute enabled or disabled?’), the Target
would respond with MUT=x, where x represents the state in question: 1 being ‘enable’ and 0 being ‘disable’.
Second, if the Controller sends an instruction to set a parameter to a particular value, and if the value sent in the argument is valid, then
the Target will acknowledge the message by replying with MUT= (with no message arguments).
?
(ASCII code 63) This character is used only if the Controller sends an instruction to set a parameter to a particular value, then, if the value sent in the
argument is not valid, the Target will acknowledge the message by replying, for example, with MUT? (with no message arguments). This
indicates that there was an error in the message sent by the Controller.