MBTCP Protocol
PLX3x Series ♦ Multi-Protocol Gateways
User Manual
Page 96 of 215
ProSoft Technology, Inc.
January 25, 2018
6.1.1 MBTCP General Specifications
The Modbus TCP/IP protocol allows multiple independent, concurrent Ethernet
connections. The connections may be all clients, all servers, or a combination of
both client and server connections.
10/100 MB Ethernet Communication port
Supports Enron version of Modbus protocol for floating-point data
transactions
Configurable parameters for the client including a minimum response delay of
0 to 65535 ms and floating-point support
Supports five independent server connections for Service Port 502
Supports five independent server connections for Service Port 2000
All data mapping begins at Modbus register 400001, protocol base 0.
Error codes, network error counters, and port status data available in user
data memory
Modbus TCP/IP Client
Actively reads data from and writes data to Modbus TCP/IP devices using
MBAP
Up to 10 client connections with multiple commands to talk to multiple servers
Modbus TCP/IP Server
The server driver accepts incoming connections on Service Port 502 for
clients using Modbus TCP/IP MBAP messages and connections on Service
Port 2000 (or other Service Ports) for clients using Encapsulated Modbus
messages.
Supports multiple independent server connections for any combination of
Service Port 502 (MBAP) and Service Port 2000 (Encapsulated)
Up to 20 servers are supported
