2. YCA Protocol
IM 249x-COMM
7
Unit Responses and Error Codes
The unit will always respond to any message addressed to it. If you send a
‘DG...’ and it is a legitimate request the response will be the setting value you
requested. Some other responses are:
SYN !
When the function code is not recognized.
N/A !
When the function code does not apply to this model. (e.g. using
‘CT’ on a Volt/Frequency meter. Or ‘OUT1’ on a unit with no
analog output.)
TMER !
When you send a ‘DP’ message to change a setting, you must
confirm it within ten (10) seconds, or the change is discarded and
the unit replies with this.
DONE
When a change has been made successfully.
ERR xxx
When a change was not successful. The ‘xxx’ gives the reason for
the failure as listed below.
ERROR CODES
CT*PT -
The combined ratio of PT and CT is too large
LO -
The value entered is too low
HI -
The value entered is too high
SPAN -
Output span is too small or too large
MIN -
Output span exceeds low limit
PARAM -
Invalid parameter value
EEPROM - EEPROM write error
(return for repair)
UNK -
Unknown error
