Remote-processing RPC-210 Manuale Utente Scaricare il pdf (Pagina 12)

SETUP AND OPERATION SECTION 2

Page 2-6

WHERE TO GO FROM HERE

If you want to do this: Turn to

Section

Save a program 3

Run a program at power up or reset

(Auto run)

Know m ore abo ut serial por ts 4

Use memory to save variables and

data

Configure digital I/O lines 6

Detect ON/OF F status of switches 6

Calendar/Clock 7

Use counter/timer 8

Measure frequency 8

Use displays 13

Connect a keypad 13

Measure voltages 11

Output a voltage 11

Refer to the table of contents for a more detailed listing.

TROUBLESHOOTING

You would probably came 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 5

in this section. The follow ing are tr oubleshooting hints

when you can' t get anything.

1. Check the power source.

There are two board power options. The first one

supplies 5 volts from an ex ternal sour ce. If this is

below 4.65 volts at the input power terminal, the

RPC-210 is in reset. Power is 5 ±0.25 volts. Make

sure the 5V supply goes to the pin marked '5' on P1

terminal strip. Rem ove jumper W8.

Make sure the 5 volt supply is "clean". 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. C heck the cen ter pin on U 7. If it is

low, then the card is in reset. This line should be

high (about 5 volts). Some switching power supplies

require a minimum load to operate. Check your

power supply specifications. The RPC-210 draws

about 120 mA.

The second option supplies 6 to 16 volts from an

external source. Power is applied to P1 terminal

marked ' E' . Verify the voltage at P1-3 (terminal

marked ' 5' ) is between 4.75 and 5.25 volts. If the

voltage is missing, verify jumper W8 is installed.

Make sure the supply voltage is relatively clean. It

may have some ripple on it, provided it does not go

below 6 volts. Make sure you are not using an AC

power source.

Make sure jumper W7 is not installed.

2. Check the COM 0 port (J1).

Make sure the VTC-9F serial cable is oriented

correctly. The key on the cable corresponds to a

silk screen area on the board.

Remove the connector from COM 0. Refer to the

outline drawing earlier in this section. Connect an

oscilloscope (preferred) or a voltmeter to pin 3

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

negative. If you have -6 volts or more, reset the

board. 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

measure AC , you should see a mom entary reading

above 2 volts.

3. Check the cable.

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. Wiring is in

SECTION 4, SERIAL PORT PIN OUT.

4. Check the serial parameters on your PC.

They should be set to:

9600 baud

No par ity

8 data bits

1 stop

Make sure you have set the communications port on

your PC to the one the VTC-9F is plugged into.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 59 60

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Remote-processing RPC-210 Manuale Utente Pagina 12

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