Remote-processing RPC-2300 Manual do Utilizador descarregar pdf (Página 9)

CHAPTER 2 SETUP AND OPERATION

RPC-2300 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.

The following are troubleshooting hints:

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

the SBS-2300 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 U14, pin 6. If it is low

(about 0 volts), then it is in reset. This line should

be high (about + 5 volts).

2. Check the COM1 port. COM1 is also known as

console port J1. Remove the connector from

COM 1. R efer to the outline drawing ear lier 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 ^ sym bol 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 m eter, you should see a change in

voltage. Using a Fluke 8060A set to measure AC,

you should see a mom entary 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 sure something 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

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

of the book.

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Remote-processing RPC-2300 Manual do Utilizador Página 9