B&B Electronics 8 PORT SMART SWITCH CE 232D4SS8 - Manual (Page 17)

Documentation Number 232D4SS84502 Manual 15
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The turn off string also adds the ASCII ESC character to the
front of the three-character turn off string.
The first character is the ASCII ESC character. The second and
third character of the command control string is the user-defined
character. The fourth character is the ASCII EOT character
(decimal 4).
Example 2: To turn off all ports and the user defined character is
ASCII STX (decimal 2).
Send to Master Port: ESC STX STX EOT
(27 2 2 4 decimal)
It is recommended that the user-defined character be a non-
printable character. The turn off command will then consist of four
characters that will not show up on the current port device.
If you were writing a program in GWBASIC to select port E of
the 232D4SS8 (address zero) you would form a string like this:
SW0E$ = CHR$(27) + CHR$(2) + "0" + "E"
You could then send SW0E$ to select port E. Similar strings could
be used for turning on the other ports. To turn off the ports the
string might look like this:
TOFF$ = CHR$(27) + CHR$(2) + CHR$(2) + CHR$(4)
NOTE: There is no delay through the Smart Switch
and the data is not buffered.
Programming the User Defined Character
The user-defined character comes programmed as the ASCII
STX character (decimal 2). You can change this to any 8-bit
character you wish by reprogramming DIP switch 2 (SW2). SW2 is
located on the printed circuit board inside the 232D4SS8. Refer to
Figure 2. SW2 is an eight-position switch with each position equal
to a certain weight. Refer to Table 4. It is recommended that a non-
printable character be defined.