Page 103 - Gas Detection Systems Training Manual

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
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