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80395G_MHW_GFX4_09-2010_ENG
4 • INSTALLATION OF “MODBUS” SERIAL NETWORK
A network typically has a Master that “manages” communication by means of “commands,” and Slaves that carry out these
commands.
GFX4 modules are considered Slaves to the network master, which is usually a supervision terminal or a PLC.
They are positively identified by means of a node address (ID) set on rotary switches (tens + units).
A maximum of 99 GFX4 modules can be installed in a serial network, with node address selectable from “01” to “99” in
standard mode or can also create a network with GFX4 and Geflex mixed in Geflex compatible mode, in which each GFX4
identifies 4 zones with sequential node address starting with the code set on the rotary switches.
GFX4 modules have a ModBus serial (Serial 1) and, optionally (see order code) a Fieldbus serial (Serial 2) with one of the
following protocols: Modbus RTU, Profibus DP, CANopen, DeviceNet e Ethernet Modbus TCP.
The MODBUS RTU port 1 has the follwing factory settings (default):
Parameter Default Range
ID 1 1...99
BaudRate 19,2Kbit/s 1200...115kbit/s
Parity None parity/odd parity/none
StopBits 1 -
DataBits 8 -
The following procedures are indispensable for the Modbus protocol.For the other protocols, see the specific Geflex manuals.
The use of rotary switches (A...F) letters is for particular procedures described in the following paragraphs.
Here are the tables showing them:
Procedure Positions of Description
rotary switches
Tens Units
AutoBaud 0 0 It enables to set the
correct BaudRate value
*AutoNode A 0 It enables to transfer the
correct node (ID) address
(tens) to eventual
GEFLEX S1/S2
Note: the AutoNode procedure is also required for Profibus DP, CANOpen, DeviceNet, Ethernet Modbus/TCP
protocols. Check its correct address in the specific manuals in question
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