Rockwell Automation 1771-DB BASIC MODULE - Manual (Page 290)

Chapter
Call Routines 69–127 13
13 -32
Use CALL 94 to display the current PRT1 port configuration on the
terminal screen.
Input and Output Arguments
This routine has no input or output arguments.
Syntax
CALL 94 Return
Example
>CALL 94
COMMUNICATION RATE= 9600
DATA BITS= 8
PARITY= NONE
STOP BITS= 1
HANDSHAKING= SOFTWARE
Use CALL 95 to retrieve the number of characters in either the receive or
transmit buffer of port PRT1.
Input and Output Arguments
This routine has one input and one output argument. The input argument is
the buffer you want to examine:
0 for the transmit buffer
1 for the receive buffer
The output argument is the number of characters.
Syntax
PUSH buffer selection
CALL 95
POP number of characters
Example
>1 REM EXAMPLE PROGRAM
>10 PUSH 0 : REM EXAMINES THE TRANSMIT BUFFER
>20 CALL 95
>30 POP X : REM GET THE NUMBER OF CHARACTERS
>40 PRINT “NUMBER OF CHARACTERS IN PRT1 TRANSMIT BUFFER IS
”,X
>50 END
CALL 94: Display Current
PRT1 Port Setup
CALL 95: Get Number of
Characters in PRT1 Buffers