Remote-processing CAMBASIC User Manual download pdf (Page 92)

Commands - 59

INKEY$

Function

SYNTAX: a$ = INKEY$(n)

PURPOSE: To return a single character from a serial input buffer.

REMARK S: The returned value is a null or one– character– length string.

n = valid serial port number, 1 or 2.

As long as there are characters in the input serial buffer, you may bring them out one at a time.

Each time INKEY$ is executed, a character is removed from the buffer. The buffer is 255

characters.

RPC-2350 NOTE: The CAM BASIC statement BIT 128,4, 0 may need to be executed before you

will receive any characters. This command enables the CTS line to the sender.

RELATED: COM$, INPUT

EXAMPLE: 10 A$ = INKEY$(1)

20 IF A$ = "" THEN 10

30 IF A$ = "Y" THEN PRINT "YES"

40 IF A$ = "N" THEN PRINT "NO"

50 GOTO 10

ERROR: < Illegal argument> – if n is not a legal port number

< Data negative> – for n

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Remote-processing CAMBASIC User Manual Page 92