Remote-processing RPC-330 Bedienungsanleitung PDF herunterladen (Seite 17)

SERIAL PORTS SECTION 4

Page 4-4 RPC-330

Access CO M0 and C OM1 buffers in one of three ways:

1. INPUT statement. This removes a ll characters in

the buffer up to the term inator cha racter and puts

them into a variable.

When using the INPUT statement, program

execution is suspended until a < cr> (Enter key) is

received. W hether this is a problem depends on

your particular application.

INPUT strips bit 7. This means ASCII characters

from 0 to 127 are received.

2. GET function. Characters ar e rem oved one at a

time as an ASCII value. A 0 is returned when the

buffer is empty. Use the C OM function to

determine if the buffer is empty or if a 0 is an

ASCII value.

If you don' t read the b uffer an d the buffer fills, all

subsequent characters are discarded. GET m ay be

used anywhere in the program.

3. COM$(n) retrieves all characters in the buffer,

including other control codes (except CR).

ACCESSING COM0 AND COM1

The port INPUT and GE T functions retrieve data using

the UIn command. UI0 routes inputs to C OM0 while

UI1 routes inputs to the COM1 port. PRINT outputs are

set by the UOn command. UO0 p rints out C OM0 while

UO1 outputs COM1. PRINT #1, is an alternative way

to print to COM 1.

The following show how UIn and UOn work.

100 UI0 Set to COM0

110 INPUT A Get data from COM0 port

520 UI1 Switch to COM1 port

530 INPUT B Get data from COM1 port

800 REM Print to COM0

810 PRINT "Temperature:",T

900 REM Print to COM1

910 PRINT #1, "Set pressure at:",CA

Power up default is set to COM0.

DISABLING CONTROL-C

Program execution is terminated by entering a

< Cntl> < C> . To disable < Cntl> < C> so program

execution is not terminated, execute the following

statement:

DBY(38) = DBY(38) .OR. 1

COMMANDS

The following is a list of RPBASIC-52 commands used

for serial I/O. These commands and functions are

explained in the BASIC-52 Programm ing Manual and

RPBASIC-52 Software Supplement in this manua l.

Command Function

CLEAR COM$ Clears serial input buffer

COM$ Returns string from buffer

COM Returns number of characters

in buffer

CONFIG BAUD Sets serial port parameters

GET Returns a character from the

serial buffer

INPUT Receives string from port

LIST Outputs program listing

ON COM$ Branches to a subroutine when

specified parameters are met

PRINT Outputs data in various

formats

PRINT #, Prints to a specified port

SPC Print out n number of spaces

STR Various string commands.

Useful for networking and

output formatting.

TAB Tabs to predetermined

positions

UI0 Reroute inputs to COM0

UI1 Route inputs to COM1

UO0 Rerou te PRIN T statement to

COM0

UO1 Route P RINT statement to

COM1

USING PRINT formatting statement

SERIAL PORT PIN OUT

Pin outs for J1 and J2 are shown below. Unused pins

are open.

J1 & Name Direction

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 47 48

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