__________________________________________________________________________ 2 Connectors
PolaRx3e Product Family Hardware Manual v1.1.0
10
The receiver behaves as Data Terminal Equipment (DTE). For direct connection to a terminal or a PC,
a null-modem cable is needed. By default, for the raw RS-232 serial connection via the COM ports, no
handshaking is needed. Hence, either a complete or a simplified null-modem cable may be used.
On COM2, pin#1 provides a 5V DC voltage, e.g. to allow feeding a Bluetooth™ device.
Minimal null-modem connection:
Receiver side: ODU 7 pins (male)
1
2
GND
3
CTS
4
RTS
5
RxD
6
TxD
7
PC side: DSUB9 (female)
1
CD
2
RxD
3
TxD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
Null-modem connection with RTS/CTS support:
Receiver side: ODU 7 pins (male)
1
2
GND
3
CTS
4
RTS
5
RxD
6
TxD
7
PC side: DSUB9 (female)
1
CD
2
RxD
3
TxD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
