Owner`s manual

24
When the Model 24H retransmits the data to the peripheral device and
the peripheral device cannot receive any more data, the Model 24H will
expect to receive an XOFF character. When the peripheral device can
receive more data, the Model 24H will expect to receive an XON
character.
Peripheral-to-multiport-to-host communication:
When a peripheral device transmits data to a Model 24H peripheral
port, the data is received and stored in a buffer (512K standard,
available up to 4.5 MB) which in turn retransmits the data to the host
device through the host port. During transmission when there are only
15 bytes left in the buffer, the Model 24H will send an XOFF character
signalling the peripheral device that it can no longer accept data.
When the buffer empties to the point where it can accept more data,
the Model 24H will send an XON character.
When the Model 24H retransmits the data to the host device and the
host device can no longer accept data, the Model 24H will expect to
receive an XOFF character or detect a false condition on the host port's
CTS line. When the host device can accept more data, the Model 24H
will expect to receive an XON character and detect a true condition on
the CTS line.