Comtech EF Data DT-4500 Series - Manual (Page 79)

DT4500 Series Down Converters MN/DT4500.IOM
Remote Control Revision 1
61
B.5 M
ESSAGE
S
TRUCTURE
The structure of a Command, Response or Error Message is as follows:
Start Character.
Device Address.
Command or Response.
End of Message String.
B.5.1 S
TART
C
HARACTER
The Start Character begins each message:
Example:
< Start of a user Command.
> Start of a converter response.
B.5.2 D
EVICE
A
DDRESS
The Device Address consists of a Physical Address or a Physical Address and an
appended Virtual Address. For this document, DEV is used for the generic case
examples.
Example: <3V12
B.5.3 C
OMMAND
A Command is a variable length character string beginning with a / and containing either
an instruction or an instruction and data for a converter to act upon. If data is passed by
command, it is appended to the instruction by an underscore (_). If data is retrieved by,
command underscore follows the instruction flagging the converter to supply data in a
response. In this document /COM is used for the generic case examples.
Example:
Example: Requests information from a converter.
B.5.4 C
ONFIRMATION
R
ESPONSE
A confirmation will change the start character, and echo the Device Address and
Command. Any requested data will be appended to the Command.
Example: >DEV/COM_xxx'cr''lf']