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LPOD C-, X-, or Ku-Band Outdoor Amplifier / Block Up Converter (BUC)
Serial Interface Operation
The Controller device manages the monitor and control processes. It is the only device that can start data transmission at will.
Messages sent from the Controller to the Target require responses, except in these cases:
• Acknowledging receipt of a "command" – an instruction message issued by the Controller – to change the configuration of
the Target.
• Returning data that was requested by the Controller – response to a "query" message – that requests information from the
Target.
Target devices can transmit data only when the Controller tells them to.
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
Start of Packet
Target Address
<
0-9
ASCII code 60
ASCII codes 48-57
(1 character)
(4 characters)
Controller-to-Target examples:
Controller-to-Target
Address Delimiter
Instruction Code
/
A-Z, a-z
ASCII code 47
ASCII codes 65-90,
(1 character)
(3 characters)
(COMMAND) <0135/MUT=1{CR}
(QUERY) <0135/MUT?{CR}
5–6
Code Qualifier
= or ?
ASCII codes
97-122
61 or 63
(1 character)
MN-LPOD
Revision 14
Optional Arguments
End of Packet
Carriage Return {CR}
ASCII code 13
(n characters)
(1 character)
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