Samsung SSA-P102 User Manual page 22

troubleshooting
The reader reads a card normally but no
reaction is made to SSA-P102 or an
irrelevant card number is displayed.
No communication is available when the
system is in sync with the PC.
22_
troubleshooting
1) Check the power source of the reader.
(Check if the LED indicator of the reader is blinking when it has read a card.)
2) Check if the reader works properly.
(Disconnect the reader from the system and use a measuring device such as an oscilloscope
to measure the output port of the reader.)
3) Check if the reader is properly connected to the system.
- Check if the Wiegand communication lines between the reader and the system are
properly established.
(D0, D1)
- The Wiegand communication line should be connected to GND.
(A different power source may be fi ne but the earth-grounding point should be
connected to GND of the device.)
4) If you fi nd the output signal from SSA-P102 but with severe noise when using a measuring
device to measure the Wiegand communication line, please check the followings:
- Connect the shield wire and the spare wire of the cable to GND.
- Use the repeater.
5) If the problem persists after you followed the instructions above, please contact the
customer service for technical assistance.
1) Check the communication settings between the PC application and the device.
- Check the board ID (COMM address) and match it with that of the PC application.
- Specify a unique board ID (COMM address) for each of the multiple devices.
- Check the baud rate if it matches with the PC application.
- Check if the communication port of the PC matches that of the PC application.
- Check the communication settings of the PC application.
Parity Bit : NONE, Data Bit: 8bit, Stop Bit: 1bit
2) Check the connection staus of RS-232 and RS-422.
RS-232
SSA-P102 PC
TX Port RX
RX Port TX
GND GND
RS-422(Multi-Unit Communication)
SSA-P102 SSA-P102
RX(-) RX(-)
RX(+) RX(+)
TX(-) TX(-)
TX(+) TX(+)
For RS-422 communications, install a termination resistor at the point where the
system is connected to the RS-422/RS-232 converter of the PC.
(Install a 120Ω termination resistor between the RX+ and the RX- terminals on the
device side, another 120Ω between the TX+ and the TX- terminals; the same should
be done to the converter. If you are not sure about the wiring, contact the customer
service for your help.)
If the problem persists after you followed the instructions above, this may be caused
by the defective of an internal circuit. Contact the customer service.
If no communication is established after you tried to do so with multiple
devices, pick just one device and connect it to the RS-232/RS-422 converter,
and to the PC. Then, check if there is any communication available.
RS-422 (Independent Communication)
RS-232/422
SSA-P102
Converter
RX(-) TX(-)
Connected to the
RX(+) TX(+)
RS-232 cable of the
TX(-) RX(-)
converter
TX(+) RX(+)
RS-232/RS-422
TX(-)
Connected to the
TX(+)
RS-232 cable of the
RX(-)
converter
RX(+)
PC
PC