4 packet structure – Comtech EF Data HPOD User Manual
Page 75
HPOD C-, X-, Ku-Band High-Power Outdoor Amplifier
MN/HPOD.IOM
Serial-Based Remote Product Management
Revision 8
5–5
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. The exception to
this is when the Controller broadcasts a message (such as Set Time/Date) using Address 0, when the Target is set to EIA-485 mode.
5.3.4 Packet Structure
Controller-to-Target (Issued Command or Query)
Start of Packet
Target Address
Address Delimiter
Instruction Code
Code Qualifier
Optional Arguments
End of Packet
<
ASCII code 60
(1 character)
0000 (default)
(4 characters)
/
ASCII code 47
(1 character)
(3 characters)
= or ?
ASCII codes 61 or 63
(1 character)
(n characters)
Carriage Return
ASCII code 13
(1 character)
Packet Example:
<0412/MUT=1[cr]
Target-to-Controller (Response to Command or Query)
Start of Packet
Target Address
Address Delimiter
Instruction Code
Code Qualifier
Optional Arguments
End of Packet
>
ASCII code 62
(1 character)
(4 characters)
/
ASCII code 47
(1 character)
(3 characters)
=, ?, !, or*
ASCII codes
61, 63, 33, or 42
(1 character)
(0 to n characters)
Carriage Return
ASCII code 13 or 10
(2 characters)
Packet Example:
>0412/MUT=1[cr][lf]
Detailed description of the packet components follow.