27SA or 28SA To The PC

Troubleshooting Guide

27SA or 28SA To The PC

1) Be sure the software is loaded and running, the proper COM. port is selected, and the Baud Rate is set to 9600 (the reader default Baud Rate is 9600).

With the reader connected, the password prompt should appear.

The default password is 1,2,3,4 Enter. The Main Menu should appear, and then you will be ready to program the reader.

** If the Main Menu does not appear, then go to step #2

2) Use a DC volt meter to measure the voltages on the terminal block of the reader. Locate pins labeled Communications 1,2,3,4,5. Pin number 1 is ground, connect the black lead of the meter to pin 1. Use the red lead to read the voltages on pins 2 through 5.

Pin 2 (Receive Data, RXD). The voltage should read between -5 VDC to -12 VDC. This voltage comes from the PC. If the voltage is wrong or missing, disconnect the reader from the PC, and measure the voltages at the reader (should be 0.0 VDC) and at the PC (should be between -5 VDC to -12 VDC).

Pin 3 (Clear to Send, CTS). The voltage should read between +5 VDC to +12 VDC. This voltage comes from the PC. If the voltage is wrong or missing, disconnect the reader from the PC, and measure the voltages at the reader (should be 0.0 VDC) and at the PC (should be between +5 VDC to +12 VDC).

Pin 4 (Request to Send, RTS). The voltage should read between -5 VDC to -12 VDC. This voltage comes from the Card Reader. If the voltage is wrong or missing, disconnect the reader from the PC, and measure the voltages at the reader (should be -9.5 VDC) and at the PC (should be 0.0 VDC).

Pin 5 (Transmit Data, TXD). The voltage should read between -5 VDC to -12 VDC. This voltage comes from the Card Reader. If the voltage is wrong or missing, disconnect the reader from the PC, and measure the voltages at the reader (should be -9.5 VDC) and at the PC (should be 0.0 VDC).

3) If the voltages on pins 2 and 3 are missing:

Be sure the software is loaded and running, the proper COM. port is selected, and the Baud Rate is set to 9600 (the reader default baud rate is 9600).

Verify the wiring called out in the manual is correct:

Terminal Block #	DB25 Female Pin #	DB9 Female Pin #
1	1&7	5
2	2	3
3	4	7
4	5	8
5	3	2

4) If the voltages on pins 2 or 3 are too low, then try another COM. port, or another PC.

5) If the voltages on pins 4 or 5 (-9.5vDC) are bad, then the RS232 port on the card reader might be defective.

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