To Set The Communication Lock Parameter; To Test The Communication - ABB RS485 Installation And Startup Manual

 The Modbus slave is now ready to receive Modbus queries from the Modbus
master and to send Modbus response accordingly
If something goes wrong, see the trouble shooting section hereafter


4.6 To set the COMMUNICATION LOCK parameter

If the RVT's parameters should be changed only from the Modbus network, set

the Communication lock item as locked. It can be found under the following
menu:

4.7 To test the communication

Depending on the way the controller is connected to the Modbus network, different ways
of testing may be chosen.
The user can find much application on the internet to scan Modbus devices and test
communication.
In case of problem, please refer to the troubleshooting paragraph.
o
COMMUNICATION - I/O CONFIGURATION – COM. SETTINGS –
MODBUS
Choose a slave address (the address must be unused in the

Modbus network it is inserted in)
 Select the right communication speed (baud rate)
 Select the right parity checking
Select the right number of stop bits

o
COMMUNICATION - I/O CONFIGURATION – COM. SETTINGS
Set the Communication lock parameter to 'Locked'

RS485  RS485 Modbus adapter - 13