Miyachi Unitek ISA Series, Руководство оператора

Страница: 98 / 122

APPENDIX F: COMMUNICATIONS
ISA-4001CR INVERTER POWER SUPPLY
F-4 990-364
Unit Responses To External Commands
Errors or Unsupported Commands
The ISA will respond with a Negative Acknowledge <
NAK
> (
0x15
) when an error is encountered.
The ISA will return a Negative Acknowledge <
NAK
> in response to any command that is not
supported.
<soh> <@> <
NAK
> <err> <cksum> <eot>.
Where <err> = “1” NO <SOH> “4” Timeout.
“2” BAD checksum. “5” ISA is in Local
“3” Unrecognized command. “6” Data Bad.
Valid Commands
A valid command will return EITHER data OR <ACK> (0x06) .
<soh> <@> <ACK> <cksum> <eot>.
Data will be returned with the following structure:
<soh> <@> <cmd> <cnt> <data> <cksum> <eot>
NOTE:
When you issue a command to the ISA, you need to wait for the response before you issue the
next command within answer timeout of 250 ms. in case the ISA doesn’t respond to a command.
The ISA should respond within this timeout.