Remote-processing RPC-30 Bedienungsanleitung PDF herunterladen (Seite 11)

CHAPTER 2 SETUP AND OPERATION

RPC-30 Page 9

TROUBLESHOOTING

You probably turned 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 section 5.

The following are troubleshooting hints:

1. Check the power source. If it is below 4. 65 volts,

the RPC-30 will be 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 w ill be in

permanent reset. Check U6, 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 1 port. C OM1 is also known as J1.

Remove the connector from COM 1. Refer to the

outline drawing earlier in this chapter. Connect an

oscilloscope (preferred) or a voltmeter to pin 3

(Txd) and ground. Pin 3 should be -6 volts or more

negative. (Pin 1 is designated by the < symbol on

the connector. Pin 3 is next to it, nearer the key

opening.) If you have -6 volts or

more, p ress the r eset switch. The T X1 LE D should

flash. If you have a scope attached, you should see

a burst of activity. If you have a volt meter, you

should see a change in voltage. Using a Fluke

8060A set to measure 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 . C heck to make sure something is

not shorting the output. It is possible for the LED

to flash and not have an output.

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

They should be set to:

19200 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, make sure the RX1 led flashes

when you hit a key.

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

of the book.

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