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CHAPTER 4 SERIAL PORTS

RPC-150 Page 11

In this mode, you have access to the full 256 bytes.

If you don' t read the buffer and the buffer fills, all

subsequent characters are discarded. INKEY$(n)

may be used anywhere in the program.

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

including < cr> 's and other control co des. This

function is commonly used with ON COM$

multitasking statement. You can retrieve 128 of the

256 bytes in the serial buffer at one time.

SERIAL PORT FILE NUMBERS

CAM BASIC references the ser ial I/O ports by file

numbers, similar to DOS. The following table shows

the corresponding file number to serial I/O port and how

they are used with the various ports.

Description File Examples

COM1 1 PRINT "Hello"

PRINT #1," Hello"

INPUT A$

INPUT #1,A$

A$ = INKEY$(1)

COM2 2 PRINT #2," Hello"

INPUT #2,A$

A$ = INKEY$(2)

COM1 is J1, the console port. COM2 is J4, the primary

port.

COMMANDS

The following is a list of CAMBASIC commands used

for serial I/O. Variations for many commands not listed

here. These commands and functions are ex plained in

the CAMBA SIC Programming Manual.

Command Function

CLEAR COM$ Clears serial input buffer

COM$ Returns string from buffer

CONFIG BAUD Sets serial port parameters

CONFIG COM$ Configures port for ON

COM $(n) interrupt

INKEY$ Returns a character from the

serial buffer

INPUT Receives string from port

LIST Outputs program listing

ON COM$ Calls subroutine on serial

input

PRINT Outputs data in various

formats

TAB Tabs to predetermined

positions

SERIAL CABLE PIN OUT

The following is the pin out between the IDC connector

for the SBS-150 and the DB-9 connector to the PC or

terminal.

IDC DB-9 Description

1 4 DCD

2 3 RXD

3 2 TXD

4 1 DTR

5 5 Ground

6 n/c DSR

7 8 CTS out

8 7 RTS in*

9 n/c +5 V

10 n/c RI

J1 and J4 connector pin out.

Pin J1 J4 Direction

1 n/c n/c

2 RXD RXD Input

3 TXD TXD Output

4 n/c n/c

5 Gnd Gnd

6 n/c n/c

7 n/c CTS Output

8 n/c RTS Input

9 +5V +5V source

10 n/c n/c

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 25 26

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Remote-processing RPC-150 Manuale Utente Pagina 13

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