Remote-processing RPC-220 Manuale Utente Scaricare il pdf (Pagina 10)

SETUP AND OPERATION SECTION 2

Page 2-4

Download and R un a Demo Progr am

The file "demo.hex", should be in the root directory

where you put the demonstration program s. T his

program displays digital status at J3 and voltage inputs at

J1.

To download the program, prepare the RPC -220 for hex

download by simply typing

R< Enter>

' R' is the hex download command. The monitor

automatically converts lower case to upper case.

After you have hit the < Enter> key, you are ready to

send a text file. How this is done depends upon the

terminal program you are using. For m ost terminals,

this is a simple ASCII transfer. Refer to SECTION 3,

MONITOR COMMANDS, Miscellaneous, R Read Intel

Hex File for setup information on different programs.

For Window s Terminal, select ' T

ransfers' , then ' Send

Text File'. Select "DEMO.HEX". Appending a LF

after the C R is optional.

Downloading takes about a minute.

After download, type in:

G 8000

The program will execute starting at address 0x8000.

You should see a continuous display of analog input and

digital I/O status. At this point you can connect the

STB-20 terminal board to the analog connector J1.

Apply a battery or other < 5 volt input to one of the

channels and you should see the result. Use the STB-26

terminal boar d for J3 CP U port to chang e port status.

Refer to SECT ION 6, DIGITA L LINE S, Table 6-1 for

pin outs. You may bring the a line high or low and see

the result on the screen. T he port status in hex is

displayed.

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 external sour ce. If this is

below 4.65 volts at the input power terminal, the

RPC-220 is in reset. Power is 5 ±0.25 volts. Make

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

terminal strip.

Make sure jumper W4 is rem oved if using a 5V

supply and installed for higher voltages (using the

regulator). D efault is jumper is installed.

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-220 draws

from 80 to 140 ma, depending upon the model.

The second option supplies 6 to 21 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 W4 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.

2. Check the COM 0 port (J4).

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. (Pin 1 and pin 2 are marked on the

board). Pin 3 is next to pin 1. If you have -6 vo lts

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 Fluke 8060A set to measure AC, you

should see a momentary 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

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Remote-processing RPC-220 Manuale Utente Pagina 10

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