Rockwell-automation 2708-NBD VBASIC Language Development Kit Instrukcja Użytkownika Pobierz pdf (Strona 72)

Appendix C

Application Library Subroutines

C–4

SetDTR Sets the state of Data Terminal Ready.

SetRTS Sets the state of Request To Send for a comm port.

Set state = TRUE to turn DTR or RTS on. You may examine the global

variables RTS1%, DTR1%, RTS2%, and DTR2% to get the current state.

n% is 1 for COM and 2 for AUX.

SetDTR n%, state%

SetRTS n%, state%

SUB SetDTR ( n%, s% )

SUB SetRTS ( n%, s% )

GetDSR% Gets Data Ready status for a comm port.

A TRUE is returned if DSR is ON. n% is 1 for COM and 2 for AUX.

state = GetDSR%(n%)

FUNCTION etDSR% ( n% )

SendCom Sends a record to a comm line.

A string is sent to the comm line. The string is sent exactly as is, so append

CR or CR and LF if you are sending a line. n% is 1 for COM and 2 for AUX.

Note that COMOPEN% must be true for a send to COM to work.

COMOPEN% is true only if the TERMTYPE% is TypeNormal.

SendCom n%, s$

SUB SendCom ( n%, s$ + CHR$(CR) )

ONLINE% TRUE if the workstation is online.

IF ONLINE% THEN . . .

MEMFULL% TRUE if less than 1024 bytes remain in RAM.

This should be checked before any SendQue or outputs to the RAM files to

prevent memory full.

IF MEMFULL% THEN . . .

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Rockwell-automation 2708-NBD VBASIC Language Development Kit Instrukcja Użytkownika Strona 72