Remote-processing RPC-330 Manuale Utente Scaricare il pdf (Pagina 9)

SETUP AND OPERATION SECTION 2

Page 2-3 RPC-330

does not contain any special codes; they are sim ply

ASCII characters.

Uploading programs is simply a process of receiving an

ASCII file. You or your program simply need to send

"LIST" to receive the entire program.

Downloading a program requires transmitting an ASCII

file. As you type in (or download) a line, RPBASIC-52

tokenizes that line. The time to do this depends upon its

complexity and how many lines of code have been

entered.

RPBASIC-52 m ust finish compiling a line before starting

the next one. When a line is compiled, a "> " character

is sent. This should be your terminal programs pacing

character when downloading a program.

If your communications program cannot look for a

pacing prompt, set it to delay transmission after each line

is sent. A 100 ms delay is usually adequate, but your

program may be long and complex and require more

time. A r esult of a short transmission time is missing or

incomplete program lines.

Editing programs and program ming hints

Files uploaded or downloaded are simply ASCII DOS

text files. No special characters or control codes are

used. You may create and edit programs using your

favorite word processor or editor. Just be sure to save

files in DOS text form at.

A technique used to further program documentation and

reduce code space is the use of comments in a

downloaded file. For example, you could have the

following in a file written on your editor:

REM Check position

REM Read output from the pot and

REM calculate the position

2200 a = ain(0) :REM Get position

The first 3 comments downloaded to the RPC -330

are ignored. Similarly, the empty lines between

comm ents are a lso ignored . L ine 2200, with its

comment, is a part of the program and could be listed.

The major pena lty by wr iting a progr am this w ay is

increased download time.

Notice that you can write a program in lower case

characters. RPBASIC-52 translates them to upper case.

Some program mers put "N EW" as the first line in the

file. During debugging, it is common to insert

"temporary" lines. This ensures that these lines are

gone. Downloading time is increased when the old

program is still pre sent. If you like to wr ite programs in

separate modules, you can download them separately.

Modules are assigned blocks of line numbers. Start up

code might be from 1 to 999. Interrupt handling

(keypad, serial ports) might be from lines 1000 to 1499.

Display output might be from 1500 to 2500. The

programmer must determine the number of lines

required for each section.

RPBASIC-52 automatically formats a line for minimum

code space. For example, you could download the

following line of code:

10 fora= 0to5

When you listed this line, it would appear as:

10 FOR A=0 TO 5

Spaces are displayed but not stored. The following line:

10 for a = 0 to 5

would be compressed and displayed as in the second

example above. Spaces are removed. However, spaces

as part of a remark or PRINT are not removed.

Instead of uploading and downloading programs, you can

save them to the on card EPROM. This is useful if you

are using a terminal to write program s. Simply type

SAVE. To retrieve a progr am, type LOAD. If your

system has a 512K EPROM, you can save and load up to

8 programs using these commands. See SECTION 3 and

Appendix A for more inform ation.

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Remote-processing RPC-330 Manuale Utente Pagina 9

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