Page 342 - 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