Auto Select/Smart Switch Mode
Description
Auto Select mode allows the Slave devices to initiate 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.
Each Slave port is buffered until the Master is available, then 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.
When the Master device releases the Slave through the Turn Off 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:
Upon
Timeouts:
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.
Port Time:
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.
14 | Documentation Number |
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph
