Remote-processing RPC-52 Bedienungsanleitung PDF herunterladen (Seite 9)

CHAPTER 2 SETUP AND OPERATION

Page 7

TROUBLESHOOTING

You would probably turn to this section because you

could not get the sign on message. If you are getting a

sign on message but can't enter characters, then read the

end of this section. The following are troubleshooting

hints when you can't get anything.

1. Check the power source. If it is below 4.65 volts at

the input power terminal, the RPC -52 will reset.

Power is 5 ±0.25 volts. Make sure it is a clean 5

volt source. If it dips intermittently to 4.65 volts

(due to switching noise or ripple), the card will reset

for about 100 ms. If the noise is frequent enough,

the card will be in per manent reset. Check U16, pin

15. If it is low (about 0 volts), then it is in reset.

This line should be high (about + 5 volts).

2. Check the COM 0 port (J3). Rem ove the connector

from COM 0. R efer to the outline drawing ear lier in

this chapter. Connect an oscilloscope (preferred) or

a voltmeter to pin 3 (T xd) and gr ound. Pin 3 should

be -6 volts or more negative. (Pin 1 is designated

by the w symbol on the connector. Pin 3 is next to

it, nearer the key opening.) If you have -6 volts or

more, press the reset switch. If you have a scope

attached, you should see a burst of activity. With a

volt meter, you should see a change in voltage.

Using a F luke 8060A set to measu re AC , you should

see a momentary reading above 2 volts. Press reset

several times to m ake sure it captures it.

3. Install the cable and make sure the voltages and

output activity are still there. Output is from pin 3

on the VTC-9F. If not, check to make sure

something is not shorting the output.

4. Check the serial parameters on your PC or terminal.

They should be set to:

9600 baud, no parity, 8 data bits, 1 stop

5. If you are receiving a sign on me ssage but not ab le

to enter characters, check U10, pin 5 for at least -6

volts. When it is near 0 volts, the terminal or PC's

Tx line is not connected to the card. When you

press a character on the term inal or P C, you should

see the voltage go positive.

If all of this fails, call technical support listed at the front

of the book.

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