232XS2497 Manual
11
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 433-5109
SetTV$ = CHR$(27) + CHR$(2) +”T” + “6”
The “T” tells the 232XS5 it is the set timer value command and the
“6” indicates which timer value to use.
Table 7 - Timer Values
The Set Timer Mode command tells the 232XS5 whether the
time set by the Set Timer Value command will be used to determine
the time-out of an inactive port, or the length of time switching
commands are ignored. The third byte of the Set Timer Mode
command is an ASCII “M”. If the data byte (fourth byte) is an ASCII
“0”, zero (default), the timer will be setup as an inactivity timer. For
example, sending the following string to the 232XS5 will set up the
timer as an inactivity timer (assuming programmable character is the
factory default of 2).
SetTM$ = CHR$(27) + CHR$(2) +”M” + “0”
The “M” tells the 232XS5 it is the set timer mode command and the
“0” indicates to set up the timer as an inactivity timer. When the
timer is configured as an inactivity timer, the 232XS5 will monitor the
data lines (TD & RD) for data. If there is no activity for the specified
timer value, the slave port that is connected to the master port will
be disconnected. In smart switch mode, the inactivity timer can be
used to prevent the preamble codes from being received by the
slave devices. In port combiner mode, the inactivity timer can be
used to prevent devices from tying up the master port. For example
(port combiner mode), all the slave ports have their handshake lines
asserted. The device on Port C has its handshake line asserted and
is currently connected to the master port, but has not been
transmitting or receiving data. When the inactivity timer expires,
Port C will be disconnected and the next slave port will then be
connected to the master port (following the first-come-first-served
rule). Port C will then be placed at the “end of the line”.
Data Byte
Value
0 timer
disabled
1 10ms
2 25ms
3 100ms
4 500ms
5 1
s
6 5
s
7 30
s
8 1
min.
9 5
min.
