Click above to get retro games delivered to your door ever month!

COM4800

Syntax:                 COM4800

Use:                    To initialize the communications line at 4800 baud.

Parameters:             In order to initialize the communications line, the
                        baud rate, parity, stop bit, and data length
                        parameters have to be set.  Use the table below to
                        initialize the communications lines 1, 2, 3, and 4.

                        If you wanted to initialize communications line 1
                        at 4800 baud, no parity, 1 stop bit, and 7 data
                        length, you would choose the letter "A" from the
                        table below and add a comma and the communications
                        line to initialize - in this case the number 0.
                        Remember, that communications line 1 is 0, line 2
                        is 1, line 3 is 2, and line 4 is 3.

                        4800, no parity, 1 stop bit, 7 data length = A
                        4800, no parity, 1 stop bit, 8 data length = B
                        4800, no parity, 2 stop bit, 7 data length = C
                        4800, no parity, 2 stop bit, 8 data length = D
                        4800, odd parity, 1 stop bit, 7 data length = E
                        4800, odd parity, 1 stop bit, 8 data length = F
                        4800, odd parity, 2 stop bit, 7 data length = G
                        4800, odd parity, 2 stop bit, 8 data length = H
                        4800, even parity, 1 stop bit, 7 data length = I
                        4800, even parity, 1 stop bit, 8 data length = J
                        4800, even parity, 2 stop bit, 7 data length = K
                        4800, even parity, 2 stop bit, 8 data length = L

Returns:                Use the FOXLIB communications status commands
                        (i.e. COMSTAT, COMDR, COMOE, COMPE, COMFE, COMBID,
                        COMTHR, COMTSR, and COMTOE) to obtain the status of
                        the communications line if the return value is not
                        equal to 1 or 97.  If the return value is not equal
                        to 1 or 97, load and call COM4800 again to see if
                        any errors disappear.  If you did not pass the
                        parameter correctly (e.g. FOXLIB = "Z,0"), your
                        sending parameter will be unchanged.

Example:                . load c:\FOXLIB\com4800
                        . FOXLIB = "A,0"
                        . call com4800 with FOXLIB
                        . ?substr(FOXLIB,1,1) = "A"
                        .F.
                        . ?asc(substr(FOXLIB,1,1)) = 97
                        .T.
                        . rele modu com4800

First test to see if you passed the parameter correctly.  From this example,
the parameter was passed correctly since the first character is not equal to
"A".