SenSmart 3000 User's Manual
Document: UM-1003
Revision Level B
26
R S 4 8 5 MOD B U S S E T U P
R T U A d d r e s s 1
B a u d R a t e 9 6 0 0
P a r i t y N o n e
S t o p B i t 1
Figure 5-12: Modbus RS-485 Setup Menu
5.10.1 MODBUS REGISTER AND FUNCTION CODE SUMMARY
The following table identifies SenSmart 3000 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
SenSmart 3000 DISPLAY VALUES! THESE SHOULD ALSO BE READ BY ST-71 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