Appendix A COMMUNICATIONS
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263-13228
A
A4. SERIAL COMMUNICATIONS PROTOCOL
Communications software, between the power supply and customer equipment should be
design according to the following specifications.
A4.1 Basic Message Structure
A basic transmit and receive message begins with the characters "MJ" and ends with a
carriage return code (0dH : xxH means hexadecimal code). (See Table A-1)
The first message to be sent is referred as the COMMAND, while the reply to the command is
referred as the ANSWER.
Table A-1 Basic structure of Commands and Answers
A4.2 Character to Character Time-out: 0.1 sec.
Delays between characters, in the answer message, longer that 0.1 sec., shall be considered
as a transmission line failure and special considerations should be made to re-send the
message.
Character
Hex.
Code
Description
Number
Of Bytes
M4d
Command header characters 2
J4a
0 30 Network ID
Multi-drop function OFF: 01 fixed
Multi-drop function ON: 01 to 32
2
131
Xxx
Command Characters 2
Xxx
Sub-command Characters X
f xx Checksum characters
(Calculation result by Section A4.7
enters it.)
2
fxx
CR 0d Carriage return character 1
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