A-6
MODEL 2700 APPENDIX A
SERIAL COMMUNICATIONS PROTOCOL
ADDR:Instrument Address
CMD: 72H
Example:
Instrument Address = 1
To 2700 81H 72H
1.3.4 Send Base Address 76H/118
To 2700 ADDR CMD TYPE S
From 2700 ADDR CMD TYPE S A3 A2 A1 A0
ADDR: Instrument Address
CMD: 76H
TYPE: Base address type
S: Select Range
An: Base Address; A3 is MSB
See “Serial Communication Tables” for RAM addresses.
Example:
Instrument Address = 1
For Sensor Data, Sensor 1: Type = 0, Select = 0
Base Address: 08AA hex
To 2700 81H 76H 30H 30H
From 2700 81H 76H 30H 30H 30H 38H 41H 41H
‘0’ ‘0’ ‘0’ ‘8’ ‘A’ ‘A’
1.3.5 Send Instrument Status 73H/115
To 2700 ADDR CMD
From 2700 ADDR CMD ‘A’ ‘1’ STAT ‘A’ ‘2’ STAT ‘S’
Continued MSB LSB CR
ADDR: Instrument Address
CMD: 73H
‘A’’1’: Alarm1
‘A’’2’: Alarm2
STAT: Status of Alarm - either ‘G’ (not active) or ‘E’ (active)
MSB: MSB of Instrument error code
LSB: LSB of Instrument error code
CR: End of transmission
Error Code Definition
D00 SENSOR DRIVER FAILURE
D01 STANDARD RS485 DRIVER FAILURE
D02 EEPROM FAILURE
D03 DISPLAY FAILURE
D04 RAM FAILURE
D05 ROM FAILURE
D06 ERROR NO SENSORS DETECTED
D07 BUS CONTENTION FAILURE
Example:
Instrument Address = 1
Alarm2 active
Instrument Error - Display failure
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