Servodrives / inverters series COSMOS 301X Installation, use and maintenance manual - EN
5.9 RS485 interface
Some versions of servo-drive/inverter are equipped with a RS485 serial non-insulated interface. It can be
used for the control/diagnosis/parametrization of a device with MODBUS RTU protocol.
The connections are made by means of RJ45 connector on the front panel (J1); the following picture shows
the pin configuration.
RS485
connector J1
pin signal
1 DATA+
2 DATA-
3 GND
4 NC
5 NC
6 NC
7 NC
8 NC
In order to avoid reflections, it is necessary to install a 120Ω termination resistor on the end of the wired
section. The wiring can be made by means of Ethernet CAT 5E cable; otherwise, choose a shielded cable
with typical impedance of 120Ω. The shield must be connected to both sides of the connector shell.
Please refer to the Operation and Programming Manual for further information.
Ver. 1.09 SMITECdd 62/74
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