Chapter 6 Modbus TCP Interface
Introduction
Communications Profile
This chapter provides information about using the Modbus TCP interface to transfer barcode data from the
EA3600.
The Modbus TCP interface on theEA3600 supports Modbus TCP server / slave functionality. The device is able to
receive, or be the target of, I/O connections from a Modbus TCP client / master, but is not able to originate
connections itself.
Modbus Unit Identifier
The Unit Identifier (or slave identifier) should be set to 1 for all Modbus TCP requests sent to the EA3600.
Supported Modbus Functions
The following Modbus TCP function codes are supported by the EA3600.
IMPORTANT Read Chapter 2, Ethernet Interface and Chapter 3, Barcode Transfer prior to this chapter. These
chapters provide information about EA3600 behavior that spans all protocols.
Table 6-1 Program Tags
Code Function Description
03 Read Holding Registers Read from up to 125 Holding registers from a given starting
address.
04 Read Input Registers Read from up to 125 Input registers from a given starting address.
06 Write Single Register Write a single Holding register.
16 Write Multiple Registers Write into up to 125 Holding registers from a given starting address.
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General