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MBS Protocol PLX3x Series ♦ Multi-Protocol Gateways
User Manual
Page 116 of 215 ProSoft Technology, Inc.
January 25, 2018
7.1.1 Modbus Serial Specifications
Command List Up to 100 commands per Master port, each fully configurable for
Function Code, slave address, register to/from addressing and word/bit
count.
Supported Modbus
Function Codes 1: Read Coil Status
2: Read Input Status
3: Read Holding Registers
4: Read Input Registers
5: Force (Write) Single Coil
6: Preset (Write) Single Holding Register
15: Force (Write) Multiple Coils
16: Preset (Write) Multiple Holding Registers
Polling of Command
List Configurable polling of command list, including continuous and on
change of data, and dynamically user or automatic enabled.
Status Data Error codes available on an individual command basis. In addition, a
slave status list is maintained per active Modbus Master port.
Node Address 1 to 247 (software selectable)
RS Interface RS232, RS422, and RS485
7.1.2 Modbus Master/Slave Port Specifications
Type Specifications
General Parameters
Internal Database Up to 4000 registers (words) available.
Communication
parameters Port 0: Baud Rate: 110 to 115K baud
Port 1, 2, 3: Baud Rate: 110 to 115K baud
Stop Bits: 1 or 2
Data Size: 5 to 8 bits
Parity: None, Even, Odd RTS Timing delays: 0 to 65535 milliseconds
Modbus Modes RTU mode (binary) with CRC-16
ASCII mode with LRC error checking
Floating Point Data Floating point data movement supported, including configurable support
for Enron implementation