MBS Protocol PLX3x Series
User Manual Ethernet and Serial Gateways
Page 122 of 218 ProSoft Technology, Inc.
May 26, 2016
7.1 MBS Functional Overview
The Modbus Serial protocol supports both Master and slave implementations of
the protocol. Each of the gateway serial ports is individually configurable to
communicate to separate networks.
7.1.1 Modbus Serial Specifications
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
Configurable polling of command list, including continuous and on
change of data, and dynamically user or automatic enabled.
Error codes available on an individual command basis. In addition, a
slave status list is maintained per active Modbus Master port.
1 to 247 (software selectable)
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