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Auto Select/Smart Switch Mode
Description
communications with the device connected to the Master port. When
Auto Select mode is enabled through the setup software, the
232BSS4 passes data automatically from the Slaves to the Master.
sent in turn. At any time, the Master can reply to the Slaves using
the Send to Specific Ports command, or override the automatic
switching by selecting a specific port for both transmit and receive.
all ports command, the automatic switching resumes. The 232BSS4
will revert back to the Slave port that was sending data before the
Master took over or to the next sequential Slave port with data in its
buffer. For a full description of the 232BSS4 commands, refer to the
previous section, "Smart Switch Only Mode."
Options
Initial Connections:
Timeouts:
Port Time:
Documentation Number 232BSS41202 Manual
Downloaded from
Elcodis.com
electronic components distributor
Auto Select mode allows the Slave devices to initiate
Each Slave port is buffered until the Master is available, then
When the Master device releases the Slave through the Turn Off
Upon power-up, the 232BSS4 can be initialized to allow the
Master to send data to any of the Slave ports without any
commands sent. The Master can also be set to broadcast to any
or all of the Slave ports on power-up. This allows the switch to be
used to add devices to an existing COM port without any
software programming. The port initialization is configured
through the setup software.
When multiple Slave devices are sending data to the Master
port at the same time, the 232BSS4 must determine when to stop
sending from one Slave port and switch to the next. Two
parameters are required to be entered in the setup software for
Auto Select mode. The Port Time and Inactivity Time tell the
232BSS4 how much time to spend on each port, and how long a
port must be inactive before switching to the next port.
Setting the Port Time for a value other than zero configures
the Master device to receive data from a single port only for the
length of time specified during setup. Times are set in
milliseconds and can be anywhere in the range of 0 to 65,000
(65 seconds). A value of zero for the Port Time would give the
transmitting Slave port access to the Master until an Inactivity
Timeout was reached or until a specific Turn Off command was
sent from the Master device.
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445
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