Serial Communication - J4 Connector - Technosoft IDM240-5EI Technical Reference

3.2.6. Serial Communication – J4 Connector
Pin Name Type
1 485A+ I/O
2 TxD O
3 RxD I
4 N.C.
5 GND
6 485B- I/O
7 N.C.
8 N.C.
9 +5 V O
3
5 4 3 2 1
9 8 7 6
© Technosoft 2011
Function
RS-485 line A (positive during stop bit)
RS-232 Data Transmission
RS-232 Data Reception
Not Connected
Ground
RS-485 line B (negative during stop bit)
Not Connected
Not Connected
Supply for RS-485 terminator and/or supply for handheld terminal
(internally generated)
J4 - RS-232 / RS-485 Connector
- RS-232 Connection -
J4
1
TxD
2
RxD
3
GND
5
6
+5V
9
SHIELD
OFF
SW1
ON
Figure 3.27. J4 – Serial RS-232 connection
232Tx
RS-232
485Tx
Transceiver
232Rx
485Rx
RS-485
Transceiver
485 / 232
47
IDMx40
IDMx40-xxI
+3.3V
IDMx40 Technical Reference