Dot Origin VTAP100 Руководство по установке - Страница 12
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Печатать страницуA typical RS232 cable has the following DB9 female connector pinout:
A PC or terminal RS232 connector is usually DTE (data terminating equipment), typically a
male DB9 with transmit (TXD) on pin 3 and receive (RXD) on pin 2. The appropriate
connecting cable is then a DCE (data communications equipment) female DB9. TXD and
RXD pins are swapped between the DCE and DTE devices, so that the transmit pin on one
connects to the receive pin on the other.
The VTAP100 requires a 5V power supply, but not all RS232 devices have 5V on pin 9. Your
options are:
If your RS232 connector provides 5V power on pin 9, disconnect the USB cable before
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making the serial connection, then power will be provided by J1 (pins 1 and 3) and the
serial cable/host.
If your RS232 connector does not provide 5V power on pin 9, retain a USB connection in
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addition to the serial connection.
Some serial cables have a separate DC 5.5/2.1mm barrel connector to supply power. In
these cables, typically, the centre pin is +5V and the outer barrel is GND.
VTAP100 OEM MODULE
INSTALLATION GUIDE
Figure 3-4 Typical RS232 cable
Pin
Function
2
3
5
9
+5V supply (if any)
© DOT ORIGIN
VTAP MOBILE WALLET READERS
TXD
RXD
GND
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