Modbus 16-Bit Holding Register Map; Table 1: Overall 16-Bit Holding Register Region Map; Table 2: Region 0: All Sensors- Write Only; Table 3: Regions 1 - 8: Sensors (X = Region/Sensor #) - Sensor Electronics SEC Millenium Series Instruction And Operation Manual

Modbus 16-bit Holding Register Map

Table 1: Overall 16-bit Holding Register Region Map

Region Address Range
0 42001 – 42100
42101 – 42200
1
2 42201 – 42300
3 42301 – 42400
42401 – 42500
4
5 42501 – 42600
6 42601 – 42700
42701 – 42800
7
8 42801 – 42900
42901 – 43000
9

Table 2: Region 0: All Sensors- Write only

Holding Register
Address Range
42004 - 07
Alarm Set Points (Scaled)
42011
Network Zone ID (with password)
42019 - 27
Alarm Set Points (IEE 754 32-bit floating point)
42028 - 39
Calibration Value (IEE 754 32-bit floating point)
42040
Start Self Test

Table 3: Regions 1 - 8: Sensors (x = region/sensor #)

Holding Read or
Register Write
Address
42x01 Read
42x02 Read
42x03 Read
42x04 - x06 Read/Write Alarm Set Points (Scaled)
42x07 Read/Write Calibration Value (Scaled)
42x08 Read
42x09 Read
42x10 Read
42x11 Read/Write Network Zone ID
42x12 Read
42x13 Read
42x14 Read
42x15 Read
42x16 Read
42x17 - x18 Read
42x19 - x27 Read/Write Alarm Set Points (IEEE 754 32-bit float)
SEC 3120 16-bit Modbus Manual
For Version 1.2 and above
Description
Apply parameter subset to all Sensors
Sensor 1 Parameters
Sensor 2 Parameters
Sensor 3 Parameters
Sensor 4 Parameters
Sensor 5 Parameters
Sensor 6 Parameters
Sensor 7 Parameters
Sensor 8 Parameters
3120 Unit Parameters
ALL Sensor Register Description (Write Only)
(See Parameter Tables for specifics)
Sensor Register Description
(See Parameter Table for specifics)
Gas Concentration (Scaled)
Operating Status (bit map)
Sensor Firmware Version
Range Value (Scaled)
Gas Factor (Scale value)
Network Address ID
Sensor Device Type Code
Sensor Status Code
Sensor Error Code
Sensor Cell Test Warning Code
Sensor Serial Number
Current Gas (IEEE 754 32-bit float)
Page 20 Of 46
December 2012
Sensor Electronics Corporation
P/N 1580282, Rev. 1, 20121228