Modbus / Df1 Wi-Gtwy-9-Md1 - Weidmuller WI-GTWY-9 User Manual

WI-GTWY-9-xxx Wireless Gateway
• Combined networks of the above.
The WI-GTWY-9-xxx has eight on-board discrete I/O. Each I/O point can be configured
individually as a contact input signal, or a discrete output signal. Input signals can be sent via its
fieldbus connection to a host device (PLC, DCS etc) or be transmitted by radio to other WI-I/O
9-x units. The output signals can be driven by a host device, or linked to inputs on remote WI-
I/O 9-x units.
This document assumes the reader is familiar with the operation of the WI-I/O 9-x I/O modules -
for further information, please refer to the User Manuals for these products.
Ordering information:
WI-GTWY-9-MD1
WI-GTWY-9-PR1
WI-GTWY-9-PR2
WI-GTWY-9-ET1
WI-GTWY-9-DE1
WI-GTWY-9-M+1
The same ordering codes apply to the WI-GTWY-1 product range.

1.1.1 Modbus / DF1 WI-GTWY-9-MD1

The WI-GTWY-9-MD1 can be configured for Modbus master interface, Modbus slave, or DF1.
Modbus is a Master-Slave protocol originally developed by Modicon (now part of the Schneider
group). It became a popular interconnect protocol with many equipment manufacturers. One
Modbus master controls the Modbus network communications, which can comprise up to 250
Modbus slave devices. The Modbus master can read or write I/O values to/from Modbus slaves.
The WI-GTWY-9-MD1 can be configured as either Modbus Master or Modbus Slave. The
variation of Modbus supported by the WI-GTWY-9-MD1 is "Modbus RTU" (also known as
"Modbus binary").
DF1 is an Allen-Bradley protocol (Allen-Bradley is now part of the Rockwell Automation
group). DF1 offers both full-duplex (point to point) and half-duplex (multidrop) operation. The
WI-GTWY-9-MD1 only supports the full-duplex operation - this is the default DF1 mode on
most equipment. DF1 full-duplex is a "peer-to-peer" protocol. Either DF1 device can initiate
commands to the other device, and both devices will respond to commands from the other
device.
The WI-GTWY-9-MD1 has two serial connections - RS232 and RS485, on the bottom end plate
of the module. The serial port provides both RS232 and RS485 hardware connections, however
both connections are paralleled internally - both connections cannot be used at the same time.
Either RS232 or RS485 can be used for Modbus communications, however only the RS232
port can be used for DF1. The serial port must be configured to suit the host device. Serial
data rates between 1200 and 19200 baud may be selected, and character types with 7 or 8 data
bits, even/odd/none parity, and 1 or 2 stop bits may be selected.
10
Modbus Master & Slave / DF1 interface
Profibus-DP Slave interface
Profibus-DP Master interface
Ethernet interface - Modbus TCP, Ethernet IP, FTP, HTML, Email
DeviceNet Slave interface
Modbus Plus Slave interface
Introduction v1.18