MONITORING SOLUTION ENERGY
SENSeOR AMS01 User Manual 18/29
www.senseor.com
1.8.3 BUS DATA RATE
The RS485 bus data rate is dependent on the bus cable length and the number of readers on the bus.
In industrial environments, slower data communication rates are generally more reliable.
1.8.4 BUS LENGTH
Bus cable length has an impact on the overall data rates that can be achieved. A conservative rule for
RS485 follows this equation:
Baud rate x cable length (m) < 10 x 10
6
A 9 600 bauds network would require a bus length less than (10 x 10
6
/ 9 600) equals to 1 042 meters
(about 3 400 feet). This is perfectly adequate for most substation installations.
1.8.5 NUMBER OF READERS
The more readers on the RS485 bus there are, the weaker the baud rate is. Baud rate must be adjusted
to accommodate the electrical characteristics depending on the circuit.
The following table provides an example of recommended baud rate following the number of readers:
SENSeOR recommends to connect a maximum of 15 readers on a RS485 bus.
1.8.6 MODBUS-RTU DEFAULT CONFIGURATION
By default, the reader is configured with the following settings:
- Baud rate: 19 200
- Data bits: 8
- Parity: None
- Stop bits: 1
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