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PHOENIX CONTACT 3827_en_B
Figure 4-4 Connecting the power supply
In order to prevent damage to the wireless module, we recommend the installation of a
surge arrester. Wiring between the surge arrester and the wireless module should be as
short as possible. Please also observe the manufacturer’s specifications.
4.1.4 Serial interfaces
The RAD-900-IFS wireless module has one RS-232 interface and one RS-485 2-wire
interface. Connect the I/O device to the wireless module via the corresponding serial
interface.
4.1.4.1 Connecting the RS-485 cable
In RS-485 mode, an RS-485 network with several I/O devices can be created. Use a
twisted-pair, common shielded bus
RS-485 pin assignment
In RS-485 mode, you can create a network with several I/O devices. Use a twisted-pair bus
cable to connect the I/O devices. Install this bus cable with a termination network at the two
furthest points.
• Connect the single wires of the data cable to the COMBICON plug-in screw terminal
block (Figure 2-1, item 10).
• Make sure the signal assignment is correct.
Both serial interfaces are deactivated by default. Activate and configure the RS-232 or
RS-485 interface using the PSI-CONF software (from Section 5.6, “Configuration via PSI-
CONF software” onwards).
You can only use one interface per wireless module. Parallel operation of both interfaces
is not possible.
NOTE:
Observe the polarity of the RS-485 cable. Install the bus cable with a termination network
at the two furthest points of the RS-485 network.
Termination resistors are integrated into the RAD-900-IFS and can be switched on using
the DIP switches on the side of the module.
+
2
4
V
R
S
S
I
+
R
S
S
I
-
A
N
T
C
O
M
1
N
O
1
N
C
1
R
X
T
X
G
N
D
D
(A
)
D
(
B
)
Reset
RAD-ID
RAD-2400-IFS
S.PORT
8
8
PWR
D
A
T
ER
R
RX TX
0
V
1
.1
1
.2
R
S
S
I+
R
SS
I-
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