________________________________________________________________________________ 2 AsteRx2eH_PRO
AsteRx2 Product Family Hardware Manual v2.10.1
19
2.2.2
COM2
This 7-pin connector provides access to the second serial port (COM2).
Pin # Description
1
+5V DC output
2
Signal ground (GND)
3
Clear To Send (CTS – input)
4
Request To Send (RTS – output)
5
Receive Data (RXD – input)
6
Transmit Data (TXD – output)
7
Not connected
The receiver behaves as Data Terminal Equipment (DTE). For direct connection to a terminal or a PC,
a null-modem cable is needed.
Pin#1 provides a 5V DC voltage, e.g. to allow feeding a Bluetooth™ device.
2.2.3
COM3-4/USB
This 7-pin connector can be configured in two modes:
COM3 and COM4 mode
USB mode.
The electrical level at pin#7 defines the operating mode.
2.2.3.1
COM3-4 mode
This mode is selected by leaving pin#7 unconnected.
2.2.3.2
USB mode
This mode is selected by applying 5V DC to pin#7.
Pin #
Description
1
Not connected
2
GND
3
COM4 RX
4
COM4 TX
5
COM3 RX
6
COM3 TX
7
Leave unconnected
Pin #
Description
1
Not connected
2
GND
3
USB D-
4
Reserved
5
USB D+
6
Reserved
7
USB Vbus
