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CHAPTER 2 SETUP AND OPERATION

RPC-150 Page 7

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

below. The following ar e troubleshooting hints:

1. Check the power source. P ower is 5 ±0. 25 volts.

Make sure it is a clean 5 volt source. If it dips

intermittently to about 4.5 volts (due to switching

noise or ripple), the CPU may read an instruction

incorrectly and consequently 'crash' .

The power supply must be able to go from 0 to + 5

volts in under 100 ms. If it takes longer than this,

the card may come out of reset too soon and the

CPU will not operate correctly.

The best way to reset a card is to push the reset

button. When powering off then on, make sure the

supply gets to at least 0.7 volts before turning on the

supply. The r eset circu it must dischar ge completely

for a clean reset. This is a problem on large, linear

supplies.

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, press the

reset switch. 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 make 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 VT C-10. Check to make su re som ething is

not shorting the 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. Many times a bad or wr ong serial cable can cause

characters to get printed but you can't send anything

to the card. Make sure you are using a VTC -10

cable. This cable is wired per Chapter 4, SERIAL

CABLE PIN OUT.

If all of this fails, call technical support listed under

Chapter 1, TECHNICAL SUPPORT.

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Remote-processing RPC-150 Manuale Utente Pagina 9

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