B&B Electronics Buffered Smart Switch, 232BSS4 manual VB Example

A summary of the control characters for each combination of ports is given in Table 2.2.

For instance, to broadcast to ports B & C, send: {Char1}{Char2}{Char3}”S”{Decimal 6} (B = 2, C = 4, 2 + 4 = 6)

VB Example:

BroadcastBC$ = CHR$(27) & CHR$(2) & “S” & CHR$(6)

Clear Receive Buffer – “X” + one control byte specifying which ports’ buffers to clear.

The Clear Buffer command will tell the 232BSS4 which Slave ports’ receive buffers to purge. If the Master device is only interested in the most recent data from the Slaves, this command can be used to delete old data from one or more of the Slave port buffers before it is sent to the Master.

The lowest four bits of the control byte tell the 232BSS4 which ports’ buffers to purge. Bit 0 represents port A, Bit 1 represents port B, Bit 2 represents port C, and Bit 3 represents port D. In decimal, this is represents a value of 1, 2, 4, and 8 respectively. To clear more than one buffer with a single command, the decimal equivalents of each port would be added together to give the final byte.

A summary of the control characters for each combination of ports is given in Table 2.2.

For instance, to clear the receive buffer on ports A & D, send: {Char1}{Char2}{Char3}”S”{Decimal 9}

(A = 1, D = 8, 1 + 8 = 9)

VB Example:

ClearAD$ = CHR$(27) & CHR$(2) & “X” & CHR$(9)

10 Documentation Number 232BSS4-2907m

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