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Installation
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Figure 4-5 RS-485 interface pin assignment
RS-232 pin assignment
In RS-232 mode, point-to-point connections can be established.
According to the standard, you can connect a DCE device (Data Communication
Equipment) to the RS-232 interface using a 1:1 cable (Figure 4-6). It is also possible to
connect a DTE device using a crossed cable (Figure 4-7).
Figure 4-6 RS-232 interface pin assignment (DTE - DCE)
Figure 4-7 RS-232 interface pin assignment (DTE - DTE)
If you are not sure whether the device to be connected is of DTE or DCE type, measure the
voltage between TX and GND in the idle state.
– If the voltage measures approximately -5 V, it is a DTE device.
– If the voltage measures approximately 0 V, it is a DCE device.
The RS-232 interface of the wireless module is a DTE type (Data Terminal Equipment).
This means that terminal point 5.2 (Tx) is always used for transmission and terminal point
5.1 (Rx) is always used for reception.
Only connect the wireless module to devices which meet the requirements of EN 60950.
COMBICON
D(B)
D(A) D(B)
D(A)
+
-
+
-
RS-485
RAD-2400-IFS
(4.2)
(4.1)
COMBICON D-SUB-9
RX (5.1)
TX (5.2)
GND (5.3)
RX (2)
TX (3)
GND (5)
e.g. PLC (DCE) RAD-2400-IFS (DTE)
RS-232
COMBICON D-SUB-9
RX (5.1)
TX (5.2)
GND (5.3)
RX (2)
TX (3)
GND (5)
e.g. PC (DTE)
RAD-2400-IFS (DTE)
RS-232