Super Systems H2 Sensor - Manual (Page 14)

Hydrogen (H
2
) Sensor Operations Manual
Super Systems Inc. Page 14 of 17
Appendix 1: Modbus Register Map
Register Functions and Default Values
# Function Default
0 Current firmware revision level Varies
1 RS-232 communication mode (0=Modbus slave, 1=ASCII /Previous SSI
Sensor)
DIP Sw.
2 RS-232 baud rate (0=9600, 1=19200, 2=38400) 0
3 RS-485 communication mode (0=Modbus slave, 1=Modbus master [NOT
USED])
0
4 RS-485 baud rate (0=9600, 1=19200, 2=38400) 1
5 Temperature trim for thermistor 1 / ambient temperature 200
6 A/d counts for thermistor 1 Varies
7 Thermistor 1 temperature Varies
8 %H2 A/D counts – High (Right justified: 0x00 byte, high byte, mid byte,
low byte)
Varies
9 %H2 A/D counts – Low (Right justified: 0x00 byte, high byte, mid byte, low
byte)
Varies
10 %H2 measured voltage Varies
11 %H2 as found from a polynomial Varies
12 %H2 sensor calibration (0=none, 1=zero cal, 2=span cal) 0
13 %H2 gas composition (value/100 = %H2/N2 balance) 0
14 Sensor Modbus address (important for slave communications only) DIP Sw.
15 Model Number 4100
16 Set Factory Defaults (23205=Full, 23206=%H2, 23207=Loop 1, 23208 =
Loop 2)
0
17 4-20mA #1 DAC output counts Varies
18 4-20mA #2 DAC output counts Varies
19 4-20mA #1 Source (0=%H2, 1=%DA, 2=%NH3, 3=Kn, 4= External) 0
20 4-20mA #1 Zero value Varies
21 4-20mA #1 Span Value 10000
22 4-20mA #1 External current loop (Used only if register 19 = 4) 0
23 4-20mA #2 Source (0=%H2, 1=%DA, 2=%NH3, 3=Kn, 4= External) 1
24 4-20mA #2 Zero value 0
25 4-20mA #2 Span Value 1000
26 4-20mA #2 External current loop (Used only if register 23 = 4) 0
27 Enable Calibration of 4-20ma output (0=disable, 1=enable) 0
28 Calibrate 4-20mA output (1=#1 zero, 2=#1 span, 3=#2 zero, 4=#2 span) 0
29 4-20mA calibration value (4000 to 20000 for 4-20mA) 0
30 Calibration result codes (9-12=successes, 13-16=failures, 20=no cal
specified)
0
31 Percent DA value Varies
32 Percent NH
3
value Varies
33 Super Kn value Varies
34 %N
2
flow 0
35 %NH
3
flow 0
36 %DA flow 0