A.2.2 response message format, A.2.2.1 header and ending byte, A.2.2.2 address byte – Comtech EF Data HPCST-5000 User Manual
Page 154: A.2.2.3 response byte, A.2.2.4 parameters, A.2.2.5 check byte
Programming Guide for Redundant Controller
High-Power TWTA Satellite Terminals
A–6
Rev. 1
A.2.2 Response Message Format
The structure of the response message is:
HEADER
BYTE
PRIMARY
ADDRESS
(Controller)
SECONDARY
ADDRESS
(Amplifier)
RESPONSE
Byte
PARAMETERS
(If Required)
ENDING
BYTE
CHECK
BYTE
Each element of the response message is described in the following paragraphs.
A.2.2.1 Header and Ending Byte
The response header and ending bytes are set by the command message Header Byte.
The possibilities are:
•
Response for Non-printable mode — The response message header byte is either
ASCII ACK (06H) for commands that have been accepted, or ASCII NAK (15H)
for commands that have been rejected. The ending byte is ASCII ETX (03H).
•
Response for Printable mode — The response message header byte is ASCII “{”
(7BH). The ending byte is ASCII “}” (7DH).
A.2.2.2 Address Byte
The response message primary address byte is set by the command message. The
response message secondary address byte is set by the command message.
A.2.2.3 Response Byte
The response message byte is determined by the command byte.
A.2.2.4 Parameters
Location of parameters that complement the response byte when parameters are required
for the return message.
A.2.2.5 Check Byte
The check byte is calculated the same way for response messages as it is for command
messages.