Adeunis RF ARF 3-PRO Série Notice D'emploi page 31

Tde: set according to the value of the S219 register (see the table below).
S219 0
Tde 15 µs
min
In command mode, a response is sent (over the TXD line) according to the following DE/RE timing:
The RS485 link needs to be adapted (on each side).
The modem includes a 100 W termination resistor:
• SW1.2 = ON, the resistor is connected between A and B (respectively RX+ and RX-)
• SW1.2 = OFF, the resistor is not connected between A and B.
If the modem is located at the end of the RS485 bus, SW1.1 must be set to ON.
Activity on the serial link causes the green LED to flash, whether the data transmission rate chosen is correct or
not.
208210A_UG_V1.0_ARFx3-PRO
1 2 3
35 µs 65 µs 135 µs
CMD
RXD
TXD
≥700µs
DE/RE
B' / Z
T
Rt
A' / Y
B
R
A
Network termination 485
4 5 10
150 µs 190 µs 330 µs
REPLY
≥100µs
RS485 Network
Z / TX-
100 
Y / TX+
SW1.2
B / RX-
A / RX+
MODEM
20 40 60
600 µs 1.1 ms 1.7 ms
≥100µs
T
R
GB
80
2.3 ms
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