No
.
Function
Modbus RTU 2-wire (RS485):
D- Modbus data -
D+ Modbus data +
Int./ext. power supply
- GND
+ U
int
/ U
ext
Internal voltage output 12.8 V
or
input for an external supply voltage
>12.8 - 24 V DC (+ 20%)
Digital inputs: 0 - 3, 4 - 9
Voltage level: low = min. 0 V - max. 1.8 V; high = min. 3 V - max. 24 V DC (+
20%)
Input currents: dependent on input voltage; input resistance = 46 kOhm
Digital outputs: 0 - 3
Switching capacity when power is supplied by the system monitoring plug-in
card: 3.2 W in total for all 4 digital outputs
Switching capacity when power is supplied by an external power supply deliver-
ing min. 12.8 - max. 24 V DC (+ 20%), connected to Uint / Uext and GND: 1 A,
12.8 - 24 V DC (depending on external power supply) for each digital output
The connection to the I/Os is established via the mating connector supplied.
(8) Antenna socket
This is where the WLAN antenna is connected
(9) Modbus termination switch (for Modbus RTU)
Internal bus terminator with 120 ohm resistor (yes/no)
Switch in "on" position: 120 ohm terminating resistor active
Switch in "off" position: no terminating resistor active
IMPORTANT! On an RS485 bus, the terminating resistor on the first and last
device must be active. For a detailed description, see the Installation Instructions.
40
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