Rosemount 2700 - Page 44

A-10
MODEL 2700 APPENDIX A
SERIAL COMMUNICATIONS PROTOCOL
No errors present:
From 2700 ADDR CMD CR
ADDR: Instrument Address
CMD: 74H
MAX: Number of sensors with errors
SNR: Sensor address for each sensor that has an error
Ed: Sensor error code; E3 is MSB
CR: End of transmission
SNR, ‘E’, and Ed repeat for each sensor with errors
Error Code Definition
E3 = D15 D14 D13 D12
E2 = D11 D10 D09 D08
E1 = D07 D06 D05 D04
E0 = D03 D02 D01 D00
For all sensors
D00 SENSOR FAILURE
D01 SENSOR TIMEOUT
D02 REC PARITY ERROR
D03 ECHO ERROR
D04 ECHO PARITY ERROR
D05 SENSOR RESET
D06 IREF OUT OF RANGE
D07 RTD IS OPEN
D08 RTD IS CLOSED
For Conductivity Sensors
D09 ELECTRODES SHORTED
D10 ELECTRODES OPEN
D11 OUT OF RANGE (Four-electrode sensor only)
D12 LESS THAN 500uS (Four-electrode sensor only)
D13 spare
D14 spare
D15 spare
For pH/ORP Sensors
D09 pH OUT OF RANGE
D10 mV OUT OF RANGE
D11 VREF OUT OF RANGE
D12 VGLASS OUT OF RANGE
D13 spare
D14 spare
D15 spare
Example:
Instrument Address = 1
Sensor1 has RTD Open
Sensor4 has Electrodes Open
To 2700 81H 74H
From 2700 81H 74H 32H 30H 45H 30H 30H 38H 30H 33H 45H
‘2’ Snr1 ‘E’ ‘0’ ‘0’ ‘8’ ‘0’ Snr4 ‘E’