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A network typically has a Master that "manages" communication by means of "commands," and Slaves that carry out these
commands.
GTF modules are considered Slaves to the network master, which is usually a supervision terminal or a PLC.
It is positively identified by means of a node address (ID) set on rotary switches (tens + units).
A maximum of 99 GTF, modules can be installed in a serial network, with node address selectable from "01" to "99"
GTF modules have a ModBus serial (Optional)
The MODBUS RTU port 1 has the following factory settings (default):
Parameter
Default
ID
1
BaudRate
19,2Kbit/s
Parity
None
StopBits
1
DataBits
8
The following procedures are indispensable for the Modbus protocol.
Set the rotary switch at "0+0" for AutoBaud function
Parameter
rotary switches
tens
AutoBaud
0
PLC / HMI
NOTE
The standard products DO NOT feature the comunication RS485 Modbus serial port, but can be configured via PC with Gefran
GF-Express Software, by connecting it to TTL port of GTF to PC, by means of TTL cable equipped with SW.
RS232 or USB
PC
--------------->
NEVER connect TTL adaptator to RS485 serial port of GTF.
NEVER connect TTL connector or GTF to a RS485 serial web .
Danger of product damage!!
34
4 • INSTALLATION OF THE SERIAL PORT
Range
1...99
1200...19200bit/s
Odd/Even/None
-
-
Position
unit
Allows setting of thecorrect BaudRate value automatically detecting the master
0
transmission frequency.
RS485 MODBUS RJ10 Cable
------------------------------------------>
Gefran Adapter
F049095
F043956 or
GTF with RS485
TTL cable RJ10
GTF Standard
--------------->
80960G_MHW_GTF_05-2019_ENG
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