Samsung SSA-P102T user manual Irrelevant card number is displayed, Properly established D0, D1

troubleshooting

The reader reads a card normally but no	1) Check the power source of the reader.
reaction is made to SSA-P102 or an	(Check if the LED indicator of the reader is blinking when it has read a card.)
irrelevant card number is displayed.	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 fine but the earth-grounding point should be
		connected to GND of the device.)
	4) If you find 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.
No communication is available when the	1) Check the communication settings between the PC application and the device.
system is in sync with the PC.	- 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		RS-422 (Independent Communication)
		SSA-P102	PC	SSA-P102	RS-232/422		PC
					Converter
		TX Port	RX	RX(-)	TX(-)	Connected to the
		RX Port	TX	RX(+)	TX(+)
						RS-232 cable of the
		GND	GND	TX(-)	RX(-)
						converter
				TX(+)	RX(+)
			RS-422(Multi-Unit Communication)
		SSA-P102	SSA-P102	RS-232/RS-422			PC
		RX(-)	RX(-)	TX(-)
		RX(+)	RX(+)	TX(+)		Connected to the
						RS-232 cable of the
		TX(-)	TX(-)	RX(-)
						converter
		TX(+)	TX(+)	RX(+)
		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.

¼If 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.

22_ troubleshooting