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CDM-Qx Satellite Modem Revision 4
Remote Control MN/CDMQx.IOM
C-3
C.4 Packet Structure
Controller-to-target:
Start of
Packet
Target
Address
Address
De-limiter
Instruction
Code
Code Qualifier Optional
Arguments
End of Packet
<
ASCII code 60
(1 character)
(4 characters)
/
ASCII code 47
(1 character)
(3 characters)
= or ?
ASCII code 61 or
63
(1 character)
(n characters)
Carriage Return
ASCII code 13
(1 character)
Example: <0135/TRQ=70.2345{CR}
Target-to-controller:
Start of
Packet
Target
Address
Address
De-limiter
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 code 61,
63,33,42,35,
126
(1 character)
(From 0 to n
characters)
Carriage Return,
Line Feed
ASCII code 13,10
(2 characters)
Example: >0654/RSW=32{CR} {LF}
Each of the components of the packet is now explained.
C.4.1 Start Of Packet
Controller-to-Target: This is the character ‘<’ (ASCII code 60)
Target-to-Controller: This is the character ‘>’ (ASCII code 62)
Because this is used to provide a reliable indication of the start of packet, these two
characters may not appear anywhere else within the body of the message.
The controller sends a packet with the address of a target – the destination of the
packet. When the target responds, the address used is the same address to indicate to
the controller the source of the packet. The controller does not have its own address.