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PLX3x Series ♦ Multi-Protocol Gateways MBTCP Protocol
User Manual
ProSoft Technology, Inc. Page 95 of 215
January 25, 2018
6 MBTCP Protocol
In This Chapter

MBTCP Functional Overview ................................................................ 95

MBTCP Configuration ......................................................................... 101

Network Diagnostics ............................................................................ 108

MBTCP Reference .............................................................................. 112
6.1 MBTCP Functional Overview
You can use the PLX3x gateway Modbus TCP/IP (MBTCP) protocol to interface
many different protocols into the Schneider Electric Quantum family of
processors as well other devices supporting the protocol. The MBTCP protocol
supports both client and server connections.
The gateway supports a client connection on the TCP/IP network to interface
with processors (and other server based devices) using a command list of up to
100 entries that you specify. The gateway stores the write commands for remote
processors in the gateway's lower memory. This is also where the gateway
stores data from read commands from other devices. See MBTCP Internal
Database (page 97) for more information.
Data in the lower memory of the gateway’s internal database is accessible for
read and write operations by any node on the network supporting the MBAP
(Service Port 502) or MBTCP (Service Ports 2000/2001) TCP/IP protocols. The
MBAP protocol (Port 502) is a standard implementation defined by Schneider
Electric and used on their Quantum processor. This open protocol is a modified
version of the Modbus serial protocol. The MBTCP protocol is an embedded
Modbus protocol message in a TCP/IP packet. The gateway supports up to five
active server connections on Service Ports 502, five additional active server
connections on Service Port 2000, and one active client connection.
The following illustration shows the functionality of the Modbus TCP/IP protocol.