Rs485 (Modbus) Communications - ABB ScreenMaster RVG200 Operating Instructions Manual

ScreenMaster RVG200
Paperless recorder

7.10.10 RS485 (MODBUS) communications

Note. This Section is applicable only if the optional MODBUS module is fitted.
Refer to Appendix B, page 149 for further information on using the MODBUS link.
RS485
Protocol
Type
Baud rate
Parity
Address
Note. The remaining parameters are displayed only if Protocol is set to MODBUS Master.
Poll rate
Poll fail limit
Poll rate interval
Response Timeout
126
Select the MODBUS protocol required.
MODBUS Slave –
MODBUS Master –
Set according to the number of transmission wires connected to the
recorder.
4-wire
2-wire
Set the Baud rate used by the host system: 1200, 2400, 4800, 9600,
19200, 38400, 115200.
Set the Parity used by the host system: None, Odd, Even.
Note. Displayed only if Protocol is set to MODBUS Slave.
Set a unique MODBUS Address (between 1 and 247) to enable the host
system to identify the recorder on a MODBUS link.
Note. Maximum 32 slaves per loop.
Set the poll rate in milliseconds – minimum 0, maximum 3600000.
Set the number of successive polls permitted to fail before the data is
marked as a failed input – minimum 0, maximum 4.
Set the time interval between individual messages within a poll.
Set the timeout time in milliseconds for a single poll – minimum 0,
maximum 60000.
Note. If any RTU devices are polled, set a response time that is long
enough to allow for the normal turn around time from these devices. The
configuration allows for only one setting for all devices connected to the
network.
recorder operates as a MODBUS Slave
recorder operates as a MODBUS Master
7 Configuration
OI/RVG200-EN