Comtech EF Data C Installation And Operation Manual page 31

HPOD
Customer Commands
4.13 P S
ACKET
Controller-to-target:
Start of Packet Target
Address
<
ASCII code 60
(1 character) (4 characters)
Example: <0412/MUT=1{CR}
Target-to-controller:
Start of Packet Target
Address
>
ASCII
code 62
(1 character) (4 characters)
Example: >0412/MUT=1{CR}{LF}
Each of the components of the packet is now explained.
4.13.1 S O
TART F
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.
4.13.2 A
DDRESS
Up to 9,999 devices can be uniquely addressed. In both RS-232 and RS-485 applications,
the permissible range of values is 1 to 9999. It is programmed into a target unit using the
remote control port.
IMPORTANT
TRUCTURE
Address
De-limiter
/
ASCII code 47
(1 character)
Address
De-limiter
/
ASCII
code 47
(1 character)
P
ACKET
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.
Instruction Code
Code Qualifier
= or ?
ASCII code
61 or 63
(3 characters) (1 character)
Instruction Code Qualifier
Code
=, ?, !, or *
ASCII code 61,
63, 33 or 42
(3 characters) (1 character)
4–5
Revision 1
MN/HPOD.IOM
Optional End of Packet
Arguments
Carriage
Return
ASCII code 13
(n characters)
(1 character)
Optional End of Packet
Arguments
Carriage Return,
Line Feed
(From 0 to n ASCII code 13,10
characters) (2 characters)