Oldham OLCT 200 User Manual page 51

5.10.1 MODBUS REGISTER AND FUNCTION CODE SUMMARY
The following table identifies OLCT 200 Modbus register locations and function codes.
"Chan 1" designations represent the EC channel while "Chan 2" represent the LEL / 4-
20mA Input channel.
VARIABLE
Read Only Discretes:
Chan 1 Alarm 1
Chan 1 Alarm 2
Chan 1 Fault
Chan 2 Alarm 1
Chan 2 Alarm 2
Chan 2 Fault
K1
K2
K3
Chan 1 Cal Mode
Chan 2 Cal Mode
Read/Write Coils:
Alarm Ack/Reset
Note: After writing a TRUE to this register, it resets back to FALSE automatically.
Read Only Registers:
D2A Raw Chan 1
D2A Raw Chan 2
Calibrated 10 bit value representing the D2A value of 0 to 1023 for -25 to 105 %FS (200=0% &
1000=100%).
IMPORTANT: READ REGISTERS 31001 / 31002 TO CREATE READINGS THAT MATCH
OLCT 200 DISPLAY VALUES! THESE SHOULD ALSO BE READ BY THE WX16 MODBUS
MASTERS.
A2D Raw Chan 1
A2D Raw Chan 2
10 bit value representing the A2D value of 0 to 1023 before calibration constants are applied.
Chan 1 Status
Chan 2 Status
(16 bit status words; bit assignment for each channel)
ALARM1_BELOW
ALARM2_BELOW
ALARM3_BELOW
ALARM1_LATCH
ALARM2_LATCH
ALARM3_LATCH
ALARM3_ACTIVE
CHANNEL_DISABLED
CHANNEL_CAL
CHANNEL_LINEARIZE
FAULT_RELAY_LATCH
DISPLAY_NEGATIVE
TRANSMIT SENSOR
LIFE ENABLED
ALIAS READ FUNCTION CODE
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
12001
31001
31002
31003
31004
31005
31006
BIT0
BIT1
BIT2
BIT3
BIT4
BIT5
BIT6
BIT7
BIT8
BIT9
BIT10
BIT11
BIT12
OLCT 200 User Manual | 51
WRITE FUNCTION CODE
2
2
2
2
2
2
2
2
2
2
2
1
4
4
4
4
4
4
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
5
NA
NA
NA
NA
NA
NA