Comtech EF Data LPOD PS 1.5 - Basic Protocol; Packet Structure

Low Power Outdoor (LPOD) Amplifier/Block Up Converter (BUC)
Revision 15
Serial Interface Operation 5–6 MN-LPOD
5.3.4 Basic Protocol
All data is transmitted in framed packets. The host controller is assumed to be a PC or ASCII dumb terminal, which is in charge of the
process of monitor and control. The controller is the only device that is permitted to initiate, at will, the transmission of data. Targets are
only permitted to transmit when they have been specifically instructed to do so by the controller.
All bytes within a packet are printable ASCII characters, less than ASCII code 127. In this context, the Carriage Return and Line Feed
characters are considered printable.
All messages from controller to target require a response (with one exception). This will be either to return data that has been requested
by the controller, or to acknowledge reception of an instruction to change the configuration of the target.
5.3.5 Packet Structure
Controller-to-Target
Start of Packet Target Address Address Delimiter Instruction Code Code Qualifier
Optional
Arguments
End of Packet
<
ASCII code 60
(1 character)
0-9
ASCII codes 48-57
(4 characters)
/
ASCII code 47
(1 character)
A-Z, a-z
ASCII codes 65-90, 97-122
(3 characters)
= or ?
ASCII codes
61 or 63
(1 character) (n characters)
Carriage Return {CR}
ASCII code 13
(1 character)
Controller-to-Target examples: (COMMAND) <0135/MUT=1{CR}
(QUERY) <0135/MUT?{CR}