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CDD-880 Multi Receiver Router
Serial-based Remote Product Management
7.2.2 Packet Structure
The exchange of information is transmitted, Controller-to-Target and Target-to-Controller, in packets. Each packet contains a finite
number of bytes consisting of printable ASCII characters, excluding ASCII code 127 (DELETE).
In this context, the Carriage Return and Line Feed characters are considered printable. With one exception, all messages from Controller-
to-Target require a response – 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.
Start of Packet
<
ASCII Code 60
(1 character)
Packet "issued command" example:
Packet "issued query" example:
Start of Packet
>
ASCII Code 62
(1 character)
Packet example – response received for issued query: >0000/BBU=107[cr][lf]
Detailed description of the packet components follow.
7.2.2.1
Start of Packet
•
Controller-to-Target: This is the character '<' (ASCII code 60).
•
Target-to-Controller: This is the character '>' (ASCII code 62).
Controller-to-Target (Issued Command or Query)
Target Address
Address Delimiter
0000 (default)
/
ASCII Code 47
(4 characters)
(1 character)
<0000/RSH=30[cr]
<0000/TFQ?[cr]
Target-to-Controller (Response to Command or Query)
Target Address
Address Delimiter
0000 (default)
/
ASCII Code 47
(4 characters)
(1 character)
Instruction Code
Code Qualifier
= or ?
ASCII Codes 61 or 63
(3 characters)
(1 character)
Instruction Code
Code Qualifier
= , ?, !, *, #
(ASCII Codes 61, 63,
33, 42, or 35)
(3 characters)
(1 character)
7–4
MN-CDD880
Revision 2
Optional Arguments
End of Packet
Carriage Return
ASCII Code 13
(n characters)
(1 character)
Optional Arguments
End of Packet
Carriage Return
ASCII Code 13
(n characters)
(1 character)
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