S+S REGELTECHNIK HYGRASGARD RFTF-wModbus Bedienungs- Und Montageanleitung Seite 19

G U
W-Modbus (wireless) | Network installation
General bus topology structure
with terminating and bias resistors
(Mixed configuration)
R R
AB AB
The W-Modbus protocol is based on the 2.4 GHz ISM radio band and employs a patented frequency hopping technology
to maximise reliability and resistance to interference.
This means that reliable radio transmission can also be ensured in industrial environments.
In the W-Modbus network, up to 100 nodes can communicate with each other over a long distance of up to 500 m (open field)
using one gateway. A standardised W-Modbus module ensures compatibility with all W-Modbus units.
The W-Modbus sensors only need to be supplied with power. Only the slave address is configured manually,
the transmission parameters (baud rate and parity) are set automatically. No terminating resistor is required.
The sensor is then paired with a gateway.
The W-Modbus gateway can be installed anywhere along the Modbus line. It serves as a junction between a wired
Modbus and radio-based W-Modbus. Even mixed configurations of wired and radio-based Modbus units can be
easily integrated into existing network topologies via the W-Modbus gateway.
A (D1) D+
B (D0) D–
MODBUS
W-MODBUS
Slave
Gateway
W-MODBUS
Slave 1
W-MODBUS
Slave n
(max. 100)
R
AB
W-MODBUS MODBUS
Gateway (Node Pro) Slave 1
MODBUS
RTU-Master
5 V
Pull-up /
bias resistor
R
Pull-down /
bias resistor
R
Common
(GND)
MODBUS
Slave
R
AB
W-MODBUS MODBUS
Gateway (Node) Slave 1
MODBUS MODBUS
Slave 2 Slave n
(max. 16)
19
BIAS
Line
termination
R
AB
BIAS
R
AB
R
AB