Modbus Registers

VERSION_NUMBER

0

current version number of the firmware

UART_1_MODE

1

0 = slave, 1 = Sensor Driver

UART_1_BAUD_RATE

2

Baud Rate: 0=1200,...,5=19200,...10=115200.

UART_2_MODE

3

0 = slave, 1 = Sensor Driver

UART_2_BAUD_RATE

4

Baud Rate: 0=1200,...,5=19200,...10=115200.

UART_3_MODE

5

0 = slave, 1 = Sensor Driver

UART_3_BAUD_RATE

6

Baud Rate: 0=1200,...,5=19200,...10=115200.

UART_4_MODE

7

0 = slave, 1 = Sensor Driver

UART_4_BAUD_RATE

8

Baud Rate: 0=1200,...,5=19200,...10=115200.

UART_5_MODE

9

0 = slave, 1 = Sensor Driver

UART_5_BAUD_RATE

10

Baud Rate: 0=1200,...,5=19200,...10=115200.

BOARD_ADDR

14

Board modbus address (important for slave only)

MODEL_NUM

15

MODEL number Map as reg 900

SET_FACT_DEF

16

23205 = Full Defaults, 23206 = H2 Defaults, 23207 = Loop 1 Defaults, 23208 = Loop 2 Defaults

DEGREE_REG

17

0 = °F, 1 = °C, 2 = °R, 3 = K

CUR_LOOP_CAL_REG

18

Calibration state. 0 = normal, 1 = prep zero, 2 = store zero, 3 = prep span, 4 = store span

CUR_LOOP_CAL_CHN

19

Calibration channel

CUR_LOOP_CAL_VAL

20

Cal value. 20.12 mA would be 20120

CUR_LOOP_TARGET_VALUE

22

Actual request value

CUR_LOOP_ZERO_TO_TWENTY

24

0-20 mA enable

CUR_LOOP_SOURCE

26

0 = H2, 1 = DA, 2 = NH3, 3 = KN, 4 = External, 5 = Standard Kn, 6 = NDIR gas

CUR_LOOP_ZERO

28

Zero value. This value equates to either 4 mA or 0 mA

CUR_LOOP_SPAN

30

Span value. This value equates to either 20 mA

CUR_LOOP_MANUAL

32

If manual mode is set, then this register controls (0-20000)

INST_PV_MODE

34

0 = H2, 1 = DA, 2 = NH3, 3 = KN, 4 = Standard Kn, 5 = NDIR single gas

PV_VARIABLE

35

Actual process variable.

H2_SELECTION

36

0 = Single gas OEM, 1 = In-Situ Sensor

DISP_OPT

37

Display option bitmap: bit 0 = H2, 1 = DA, 2 = NH3, 3 = Super KN, 4 = Standard KN

SER_NUM_REG

444

actual mapping from Advantech

MB_SET_TIME_WRITE

506

1 = SNTP server write, 2 = manual write

MB_SET_TM_YEAR

507

set year

MB_SET_TM_MON

508

set month

MB_SET_TM_MDAY

509

set day of month

MB_SET_TM_WDAY

510

set day of week, 0 = Sunday

MB_SET_TM_HOUR

511

set hour

MB_SET_TM_MIN

512

set minute

MB_SET_TM_SEC

513

set second

MB_TM_YEAR

514

year

MB_TM_MON

515

month

MB_TM_MDAY

516

day of month

MB_TM_WDAY

517

day of week, 0 = Sunday

MB_TM_HOUR

518

hour

MB_TM_MIN

519

minute

MB_TM_SEC

520

second

MB_COMP_TIME_YEAR

580

compile year

MB_COMP_TIME_MON

581

compile month

MB_COMP_TIME_MDAY

582

compile day of month

MB_COMP_TIME_WDAY

583

compile day of week, 0 = Sunday

MB_COMP_TIME_HOUR

584

compile hour

MB_COMP_TIME_MIN

585

compile minute

MB_COMP_TIME_SEC

586

compile second

MODEL_NUM_OLD

900

MODEL number

RESET_FACT_DEFAULTS

909

Resets everything to factory settings

MB_IP_ADDR

914

IP Address

MB_IP_MASK

918

Subnet Mask

MB_IP_GTWY

922

Gateway

SENSOR_COMM_STATUS_REG

1100

H2O2 comm status (0-16)

SENSOR_N2_FLOW

1101

N2 flow

SENSOR_NH3_FLOW

1102

NH3 flow

SENSOR_DA_FLOW

1103

DA flow

SENSOR_H2_FLOW

1104

H2 Flow

SENSOR_PV_MODE

1105

Process variable (0 = H2, 1 = DA, 2 = NH3, 3 = Kn, 4 = Standard Kn)

SENSOR_INPUT_TYPE_REG

1106

Input for voltage inputs

SENSOR_MIN_H2

1108

minimum H2 value

SENSOR_CO2_PRESENT

1109

concentration of CO2 present. Important for H2 measurement only

SENSOR_PV_REMOVE_NEGATIVE

1110

Makes any negative number zero

SENSOR_GEN_QUEUE_ENABLE

1150

Allows for a generic write

SENSOR_NH3_FLOW

1102

NH₃ flow

SENSOR_DA_FLOW

1103

DA flow

SENSOR_H2_FLOW

1104

H₂ Flow

SENSOR_PV_MODE

1105

Process variable (0 = H₂, 1 = DA, 2 = NH₃, 3 = Kn, 4 = Standard Kn)

SENSOR_INPUT_TYPE_REG

1106

Input for voltage inputs

SENSOR_MIN_H2

1108

minimum H₂ value

SENSOR_CO2_PRESENT

1109

concentration of CO₂ present. Important for H₂ measurement only

SENSOR_PV_REMOVE_NEGATIVE

1110

Makes any negative number zero

SENSOR_GEN_QUEUE_ENABLE

1150

Allows for a generic write

SENSOR_GEN_QUEUE_START

1151

Start of write. E.g., register 45.

SENSOR_GEN_QUEUE_ADDRESS

1152

Address of board to write to.

SENSOR_GEN_QUEUE_NUM_WORDS

1153

Number of words to write down up. Up to 30

SENSOR_GEN_QUEUE_BLOCK

1154

write up to 30 words

SENSOR_READ_REGISTERS

1200

just designates where to start writing

MB_READ_VERSION_NUMBER

1200

current version number of the firmware

MB_READ_PELLISTOR_AVDD

1201

A/D analog voltage supply

MB_READ_PELLISTOR_EXCV

1202

Pellistor bridge excitation voltage

MB_READ_PELLISTOR_VDC

1203

Pellistor voltage

MB_READ_PELLISTOR_NA

1204

Pellistor Normalized Absorbance

MB_READ_PERC_H2

1205

H2 x 10000

MB_READ_PER_H2_MANT

1206

H2 mantissa

MB_READ_PER_H2_EXP

1207

H2 exponent

MB_READ_PER_DA

1208

DA value

MB_READ_PER_NH3

1209

NH3 value

MB_READ_PER_SUPER_KN

1210

Super Kn

MB_READ_STANDARD_KN

1211

Standard Kn

MB_READ_PROC_VAR

1212

Process variable

MB_READ_GAS_TEMP

1213

Gas temperature

MB_READ_BOARD_ADDR

1214

Board modbus address (important for slave only)

MB_READ_MODEL_NUM

1215

MODEL number Map as reg 900

MB_READ_SET_FACT_DEF

1216

23205 = Full Defaults

MB_READ_DEGREE_REG

1217

Sets the unit used to display temperature.

MB_READ_N2_FLOW

1218

N2 flow

MB_READ_NH3_FLOW

1219

NH3 flow

MB_READ_DA_FLOW

1220

DA flow

MB_READ_H2_FLOW

1221

H2 Flow

MB_READ_PV_MODE

1222

Process variable (0 = H2, 1 = DA, 2 = NH3, 3 = Kn, 4 = Standard Kn)

MB_READ_INPUT_TYPE_REG

1223

Input for voltage inputs

MB_READ_MIN_H2

1225

minimum H2 value

MB_READ_CO2_PRESENT

1226

Amount of CO2 present up to 10%.

MB_READ_PV_REMOVE_NEG

1227

Remove negative number

MB_READ_SET_TAPS_REG

1228

Sets the digital trim pot

MB_READ_UART_1_BAUD_RATE

1229

Baud Rate: 0=1200,...,5=19200,...10=115200.

MB_READ_UART_2_BAUD_RATE

1230

Baud Rate: 0=1200,...,5=19200,...10=115200.

MB_READ_PV_FP

1231

Process variable in floating point

MB_READ_PELLISTOR_DIAG

1233

Pellistor Diagnostics

MB_READ_AMBIENT_TEMP

1234

Ambient temperature

MB_READ_CJ_TEMP_REG

1235

Cold junction temperature

MB_READ_AD_RAW_VDC

1237

Raw VDC

MB_READ_GAIN_REG

1239

Gain

MB_READ_AD_SCALED_VDC

1241

Scaled VDC

MB_READ_TC_PROC_VAR

1243

TC process variable

MB_READ_PERC_O2

1245

Based on Nernst equation

MB_READ_PERC_O_DP

1246

decimal point for O2

MB_READ_PERC_O2_FP

1247

floating point value for O2 (w registers)

MB_READ_LAMBDA_TEMP

1249

Typically 800F

MB_READ_LAMBDA_CNV_MV_EN

1250

Convert mV to probe mV

MB_READ_AMB_PRESSURE_REG

1251

Ambient pressure (absolute)

MB_READ_GAS_PRESSURE_REG

1252

Gas pressure (absolute)

MB_READ_NDIR_GAS_SELECTION

1253

[0-7]. TBD

MB_READ_NDIR_GAS_VPP

1254

Peak-peak voltages

MB_READ_NDIR_GAS_VPP_SF

1258

Peak-peak voltages. No high/low values

MB_READ_NDIR_GAS_VPP_FIR

1262

Peak-peak voltages FIR filtered

MB_READ_NDIR_GAS_NA

1266

Gas Normalized absorbance

MB_READ_NDIR_GAS_NA_TC

1269

Gas Normalized absorbance, temperature compensated

MB_READ_NDIR_GAS_CONC

1272

Gas concentration

MB_READ_NDIR_GAS_CONC_DP

1275

Gas concentration decimal point

MB_READ_NDIR_GAS_CONC_FP

1278

Gas concentration floating point

MB_READ_CAL_ENABLE_REG

1284

enables a calibration

MB_READ_CAL_REQUEST_REG

1285

CJ cal or zero/span voltage cal

MB_READ_CAL_RANGE_REG

1286

Calibration Range register. Sets the voltage gain for a calibration.

MB_READ_CAL_CHANNELS_REG

1287

bitmap of channels to be calibrated

MB_READ_CAL_VALUE_REG

1288

Calibration value

MB_READ_CAL_TIMER_REG

1293

First of 5 calibration timers

MB_READ_CAL_PROGRESS_REG

1294

0 = no calibration, 1 = calibration in progress

MB_READ_CAL_ERROR_REG

1295

First of 5 calibration error calculations

MB_DIGIO_OUTPUT_SET

1600

Bitmap that sets the output of a digital I/O card

MB_DIGIO_COMM_STATUS_REG

1601

Communication status for digital I/O card

MB_DIGIO_VERSION_NUMBER

1610

current version number of the firmware

MB_DIGIO_UART_1_MODE

1611

Determines mode: modbus slave = 0, modbus master = 1

MB_DIGIO_UART_1_BAUD_RATE

1612

Baud Rate.

MB_DIGIO_UART_2_MODE

1613

Determines mode: modbus slave = 0, modbus master = 1

MB_DIGIO_UART_2_BAUD_RATE

1614

Baud Rate.

MB_DIGIO_BOARD_ADDR

1615

Board modbus address (important for slave only)

MB_DIGIO_MODEL_NUM

1616

MODEL number Map as reg 900

MB_DIGIO_RESET_FACT_DEFAULTS

1618

SFD 23205 sets factory defaults Map as reg 909

MB_DIGIO_UART_3_MODE

1619

Determines mode: modbus slave = 0, modbus master = 1

MB_DIGIO_UART_3_BAUD_RATE

1620

Baud Rate. 0=1200 ,..., 10=115200

MB_DIGIO_SER_NUM_0

1621

Start of Serial number

MB_DIGIO_SER_NUM_1

1622

serial number 1

MB_DIGIO_SER_NUM_2

1623

serial number 2

MB_DIGIO_SER_NUM_3

1624

serial number 3

MB_DIGIO_SER_NUM_4

1625

serial number 4

MB_DIGIO_SER_NUM_5

1626

serial number 5

MB_DIGIO_SER_NUM_6

1627

serial number 6

MB_DIGIO_SER_NUM_7

1628

serial number 7

MB_DIGIO_SER_NUM_8

1629

serial number 8

MB_DIGIO_SER_NUM_9

1630

serial number 9

MB_DIGIO_EVENT_IN_CP

1636

Copy of Event Input

MB_DIGIO_EVENT_OUT_ACT_CP

1637

Actual Output

MB_DIGIO_EVENT_OUT_SP_CP

1638

Copy of Output setpoint

SENSOR_SUB_SERIAL_NUM

1700

serial number of sensor board