✓
Full configuration over bus. If the address is unique per segment when powered up, the device can be
accessed by the Modbus master (or programming tool) and the address and other parameters can then
be set to the definitive values.
✓
Partial configuration over bus: If the address is not unique per segment when powered up, each device
must get a non-conflicting address before connecting it to the bus, either by using the address input
with push-button (see
) or by setting the address to 246 with push button
press and hold between 5 and 10 seconds. After addressing all devices, the remaining configuration can
be done over the bus using the default settings for bauderate (auto-baud) and transmission mode for
the Modbus master.
✓
Overwriting the bus configuration over bus uses a timeout. If "1 = Load" is not written into Reg 768
within 30 seconds, all values are discarded.
Example: Table shows bus configuration registers before and after changing them over bus.
Reg.
Name
Pre-commissioning
New value (example)
764
Modbus Address
246
12
765
Baudrate
0 = auto
1 = 9600
766
Transmission Format
0 = 1-8-E-1
3 = 1-8-N-2
767
Termination
0 = Off
0 = Off
768
Bus Conf. Command
0 = Ready
1 = Load
RDAS…-24C variable list, Rev. A
13