ProSoft Technology MVI94-MCM-MHI - Manual (Page 6)

Contents MVI94-MCM ♦ Flex I/O Platform
User Manual Serial Communications Modbus Communication Module
Page 6 of 109 ProSoft Technology, Inc.
March 29, 2011
4.2 Using the Configuration/Debug Port ....................................................................... 47
4.3 Module Configuration .............................................................................................. 48
4.3.1 Main Menu .............................................................................................................. 48
4.3.2 Master Command Error List Menu.......................................................................... 51
4.3.3 Master Command List Menu ................................................................................... 52
4.3.4 Data Analyzer ......................................................................................................... 53
4.3.5 Database View Menu .............................................................................................. 57
4.4 Error/Status Data .................................................................................................... 60
4.4.1 Error and Status Data Table ................................................................................... 60
4.4.2 Command Error List ................................................................................................ 61
4.4.3 Slave Status List ..................................................................................................... 61
4.4.4 Error Codes ............................................................................................................. 61
4.5 LED Definition ......................................................................................................... 63
4.5.1 PRT1 ....................................................................................................................... 63
4.5.2 U1 ........................................................................................................................... 63
4.5.3 U2 ........................................................................................................................... 63
4.5.4 STS ......................................................................................................................... 63
4.5.5 PRT2 ....................................................................................................................... 63
5 Reference 65
5.1 Product Specifications ............................................................................................ 65
5.1.1 General Specifications ............................................................................................ 65
5.1.2 FLEX I/O Interfaces ................................................................................................ 66
5.1.3 General Specifications - Modbus Master/Slave ...................................................... 66
5.1.4 Functional Specifications ........................................................................................ 67
5.2 Cable Connections ................................................................................................. 68
5.2.1 RS-232 Application Port(s) .................................................................................... 68
5.2.2 RS-232 Configuration/Debug Port .......................................................................... 70
5.2.3 RS-485 Application Port(s) ..................................................................................... 70
5.2.4 RS-422 .................................................................................................................... 71
5.2.5 DB9 to Mini-DIN Adaptor (Cable 09) ...................................................................... 71
5.3 Functional Overview ............................................................................................... 72
5.3.1 About the MODBUS Protocol ................................................................................. 73
5.3.2 Virtual Modbus Database Concepts ....................................................................... 73
5.3.3 Data Transfer .......................................................................................................... 75
5.4 Modbus Protocol Specification ............................................................................... 83
5.4.1 Commands Supported by the Module .................................................................... 83
5.4.2 Read Coil Status (Function Code 01) ..................................................................... 84
5.4.3 Read Input Status (Function Code 02) ................................................................... 85
5.4.4 Read Holding Registers (Function Code 03) .......................................................... 86
5.4.5 Read Input Registers (Function Code 04) .............................................................. 87
5.4.6 Force Single Coil (Function Code 05) .................................................................... 88
5.4.7 Preset Single Register (Function Code 06) ............................................................ 89
5.4.8 Force Multiple Coils (Function Code 15) ................................................................ 90
5.4.9 Preset Multiple Registers (Function Code 16) ........................................................ 91
5.4.10 Modbus Exception Responses ............................................................................... 92
5.5 Configuration Form ................................................................................................. 95
6 Support, Service & Warranty 99
Contacting Technical Support .......................................................................................................... 99
6.1 Return Material Authorization (RMA) Policies and Conditions ............................. 101