Packet Structure; Start Of Packet; Address - Comtech EF Data LBC-4000 Installation And Operation Manual

LBC-4000 L-Band Up/Down Converter System
Remote Control
A.3 P S
ACKET
Controller-to-target:

Start of Packet

Target

Address

<
ASCII code 60
(1 character) (4 characters)
Example: <0412/MUT_A_ON{CR}
Target-to-controller:
Start of Packet Target
Address
>
ASCII
code 62
(1 character) (4 characters)
Example:
Each of the components of the packet is now explained.
A.3.1 S P
TART OF
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.
A.3.2 A
DDRESS
Up to 9999 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)
>0412/MUT_A_ON{CR}{LF}
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
ASCII code
(3 characters) (1 character)
Instruction Code Qualifier
Code
_
ASCII code 95
(1 character)
(3 characters)
A-3
MN/LBC4000.IOM
Revision 2
Optional
Arguments
_
95
(n characters)
Optional
Arguments
(From 0 to n
characters)
End of Packet
Carriage
Return
ASCII code 13
(1 character)
End of Packet
Carriage Return,
Line Feed
ASCII code 13,10
(2 characters)