Ulvac UTM300B, Инструкция по эксплуатации

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A-4
Appendix A COMMUNICATIONS
A3
SERIAL COMMUNICATIONS PROTOCOL
Communications software, between the power supply and customer equipment should be
design according to the following specifications.
A3.1 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). (Refer to 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
Character Hex.
code
Description Number
of bytes
M 4d Command header characters 2
J 4a
0 30
Network ID
Multi-drop function OFF : 01 fixed
Multi-drop function ON : 01 to 32
RS-485 settings : 99 fixed (Note 1)
2
1 31
X xx Command characters 2
X xx
Sub-command characters
Varies depending on commands and answers
X
f xx Checksum characters
(Calculation result by Section A3.6 enters it.)
2
f xx
CR
0d Carriage return character 1
(Note 1) When you use commands of RS-485 settings (Refer to Table A-2), Network ID is 99.
A3.2 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.