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NOTE: When XON/XOFF is enabled, the multiport will continue to
support hardware handshaking lines. If this is not desired, you may
disconnect the handshaking lines entirely.
support hardware handshaking lines. If this is not desired, you may
disconnect the handshaking lines entirely.
Host-to-multiport-to-peripheral communication:
When the host device transmits data to a peripheral device through
the multiport's host port, the data is received and stored in a
256-character transmit buffer which in turn retransmits it to a
peripheral device through a peripheral port. During transmission, after
the buffer receives 236 characters, the multiport will make the host
port CTS (Clear-To-Send) line false (negative voltage), signaling the
host device that it cannot accept more data (however, in reality it can
accept another 20 characters before overflowing the buffer).
the multiport's host port, the data is received and stored in a
256-character transmit buffer which in turn retransmits it to a
peripheral device through a peripheral port. During transmission, after
the buffer receives 236 characters, the multiport will make the host
port CTS (Clear-To-Send) line false (negative voltage), signaling the
host device that it cannot accept more data (however, in reality it can
accept another 20 characters before overflowing the buffer).
If XON/XOFF handshaking is enabled and the host device does not
respond, 8 characters later the multiport will send an XOFF character,
signaling the computer that it cannot accept more data (however, in
reality it can accept another 12 characters before overflowing the
buffer).
respond, 8 characters later the multiport will send an XOFF character,
signaling the computer that it cannot accept more data (however, in
reality it can accept another 12 characters before overflowing the
buffer).
When the multiport's buffer empties, the multiport will make the CTS
line true (positive voltage) and send an XOFF character (if XON/XOFF
is enabled), signaling the host device that it can accept more data.
line true (positive voltage) and send an XOFF character (if XON/XOFF
is enabled), signaling the host device that it can accept more data.
When the multiport retransmits the data to the peripheral device
through a peripheral port, and the peripheral device cannot receive
any more data, the multiport will expect to see a false condition on the
DTR (Data Terminal Ready) line or receive an XOFF character (if
XON/XOFF is enabled). When the peripheral device can receive
more data, the multiport will expect to see a true condition on the DTR
line or receive an XON character (if XON/XOFF is enabled).
through a peripheral port, and the peripheral device cannot receive
any more data, the multiport will expect to see a false condition on the
DTR (Data Terminal Ready) line or receive an XOFF character (if
XON/XOFF is enabled). When the peripheral device can receive
more data, the multiport will expect to see a true condition on the DTR
line or receive an XON character (if XON/XOFF is enabled).