Sensor Electronics SEC 3000, Instruction And Operation Manual

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SEC 3120 16-bit Modbus Manual Page 2 Of 46 Sensor Electronics Corporation
For Version 1.2 and above December 2012 P/N 1580282, Rev. 1, 20121228
Table Of Contents
General Description ......................................................................................................... 3
Overall SEC 3120 Modbus Register Map ........................................................................ 4
SEC 3120 Setup and Configuration ................................................................................. 6
Modbus 16-bit Holding Register Map ............................................................................ 20
Modbus Protocol ........................................................................................................... 21
Implemented Functions and Registers Defined .............................................................. 25
Function Code 03 - Read Holding Registers .................................................................. 26
Function Code 06 - Preset Single Holding Register ....................................................... 33
Function Code 16 - Write Multiple Holding Registers ................................................... 38
Sensor Roles and Modbus ............................................................................................. 44
List Of Tables
Table 1: Overall 16-bit Holding Register Region Map ................................................... 20
Table 2: Region 0: All Sensors- Write only ................................................................... 20
Table 3: Regions 1 - 8: Sensors (x = region/sensor #) .................................................... 20
Table 4: Region 9: 3120 Unit Registers ......................................................................... 21
Table 5: RTU Message Frame ....................................................................................... 23
Table 6: Function Codes Supported By SEC 3120 ......................................................... 25
Table 7: Function Code 03 Read Holding Registers ....................................................... 26
Table 8: Sensor Status Code Parameter Table ................................................................ 29
Table 9: Sensor Error Code Parameter Table ................................................................. 30
Table 10: Alarm Configuration Parameter Table ........................................................... 31
Table 11: Function Code 06 Preset Holding Register ..................................................... 34
Table 12: Function Code 16 Multiple Write Holding Registers ...................................... 38
List Of Figures
Figure 1: Modbus RS485 Connections............................................................................. 7
Figure 2: SEC 3120 User Interface .................................................................................. 9
Figure 3: SEC 3120 Top Menu ...................................................................................... 10
Figure 4: SEC 3120 Nested Menu Navigation ............................................................... 11
Figure 5: Changing the 3120 Sensor Role ...................................................................... 13
Figure 6: Changing the 3120 Relay Logic Mode ............................................................ 14
Figure 7: Changing the 3120 Network ID Mode ............................................................ 16
Figure 8: Changing the 3120 Network ID ...................................................................... 17
Figure 9: Changing 3120 485 Bus Settings .................................................................... 18