![background image](http://html1.mh-extra.com/html/oldham/olct-200/olct-200_user-manual_3711996051.webp)
51
OLCT 200 User Manual |
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
ALIAS
READ FUNCTION CODE
WRITE FUNCTION CODE
Read Only Discretes:
Chan 1 Alarm 1
2001
2
NA
Chan 1 Alarm 2
2002
2
NA
Chan 1 Fault
2003
2
NA
Chan 2 Alarm 1
2004
2
NA
Chan 2 Alarm 2
2005
2
NA
Chan 2 Fault
2006
2
NA
K1
2007
2
NA
K2
2008
2
NA
K3
2009
2
NA
Chan 1 Cal Mode
2010
2
NA
Chan 2 Cal Mode
2011
2
NA
Read/Write Coils:
Alarm Ack/Reset
12001
1
5
Note:
After writing a TRUE to this register, it resets back to FALSE automatically.
Read Only Registers:
D2A Raw Chan 1
31001
4
NA
D2A Raw Chan 2
31002
4
NA
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
31003
4
NA
A2D Raw Chan 2
31004
4
NA
10 bit value representing the A2D value of 0 to 1023 before calibration constants are applied.
Chan 1 Status
31005
4
NA
Chan 2 Status
31006
4
NA
(16 bit status words; bit assignment for each channel)
ALARM1_BELOW
BIT0
ALARM2_BELOW
BIT1
ALARM3_BELOW
BIT2
ALARM1_LATCH
BIT3
ALARM2_LATCH
BIT4
ALARM3_LATCH
BIT5
ALARM3_ACTIVE
BIT6
CHANNEL_DISABLED
BIT7
CHANNEL_CAL
BIT8
CHANNEL_LINEARIZE
BIT9
FAULT_RELAY_LATCH
BIT10
DISPLAY_NEGATIVE
BIT11
TRANSMIT SENSOR
LIFE ENABLED
BIT12
Summary of Contents for OLCT 200
Page 4: ...OLCT 200 User Manual 4...
Page 14: ...OLCT 200 User Manual 14 Figure 2 3a Outline Drawing OLCT 200 Wired Models...
Page 19: ...OLCT 200 User Manual 19 2 6 2 Installation Drawing 11 0100...
Page 32: ...OLCT 200 User Manual 32...
Page 36: ...OLCT 200 User Manual 36...
Page 38: ...OLCT 200 User Manual 38 Figure 4 1 Calibration Gas Input...
Page 61: ...OLCT 200 User Manual 61 Figure 6 5...
Page 62: ...OLCT 200 User Manual 62...
Page 79: ...OLCT 200 User Manual 79...