C.5 packet structure, C.5.1 start of packet – Comtech EF Data SLM-5650A User Manual
Page 355
SLM-5650A Satellite Modem
Revision 8
Appendix C
MN-SLM5650A
C–3
C.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)
(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)
Example:
<0135/TFQ=70.2345{CR}
Target-to-Controller
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)
(From 0 to n
characters)
Carriage Return,
Line Feed
ASCII codes 13,10
(2 characters)
Example:
>0654/RSW=32{CR}{LF}
C.5.1 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.