When the specified Port Time has elapsed, the 232BSS4 checks in sequence for other Slave ports with buffered data and switches to them. If no other Slave ports need access to the Master, the current Slave port will again be connected until another Port Time has elapsed.
Inactivity Time:
The Inactivity Timer tracks how long a Slave port has been idle. The Inactivity Time is reset any time data is received on the connected Slave port or sent out the Master Port. This way, if the Master port is slower than the connected Slave port, the Slave port is not considered inactive while waiting for the Master to catch up.
Inactivity Time is set through the setup software. 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 Inactivity Time would give the transmitting Slave port access to the Master until a Port Timeout was reached or until a specific Turn Off command was sent from the Master device.
Port and Inactivity Time Setup Tips:
Normally, the Inactivity Time should be set lower than the Port Time. Setting a zero for either value allows the other to have full control of port switching. Setting a value of zero for both timeouts keeps the Slave port connected until explicitly turned off by the Master device through the Turn Off all ports command.
Slave Preamble:
Each Slave can be programmed to transmit a preamble to the
Master device when the Slave becomes connected. This tells the Master device which new Slave is sending data. The preamble is set in the setup software and can be any character sequence up to four characters long. The preamble is sent to the Master device whenever a port is selected through commands or when the port will be sending data to the Master device because of an automatic switch.
Documentation Number | 15 |
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