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Using the Terminal Configurator
A-12
immediately; otherwise, all of the data thereafter would be lost.) The host computer,
however, would have to ask permission from the modem to send data. The host would do
this by asserting the RTS line. The modem would see this, and check to see if it were ready
to accept data. If so, it would then assert the CTS line, thus giving it permission. Once the
host computer finished sending the data, it would drop the RTS line and the modem would
subsequently drop the CTS line.
This is the behavior that is emulated when RTS is used as the value for the CTS entry. This
is obsolete behavior, and most devices are designed for RTS to really mean flow control in
the computer’s direction. But the ability is there if you have older equipment. If this setting
is chosen, then set the RTS entry to “no” since that line will not have the meaning of
incoming flow control.
• incoming software. Allowed values are yes and no.
• rts. Allowed values are yes and no.
• dtr. Allowed values are yes and no.
• outgoing software. Allowed values are yes and no.
• dsr. Allowed values are yes and no
• cts. Allowed values are yes, no, and rts.
[i/o control]
I/O control defines control over digital inputs and outputs of the Ethernet Adapter,
separately from the data lines. Digital input and output are shared with the flow control
lines (RTS, DTR, CTS, DSR), but they are not flow control. They give the ability to send
digital data from one Ethernet Adapter to another without interpretation by the Ethernet
Adapter’s themselves. They can also provide information to the device they are connected
to about the status of low-power modes.
• rts. Allowed values are none and passthrough.
• dtr. Allowed values are none and passthrough.
RTS and DTR are output lines. When set to “passthrough,” the status of these lines will be
forwarded to the Ethernet Adapter unit specified by the “socket” option described below.
When set to “none” they do not function as digital inputs.
• cts. Allowed values are negate, assert and passthrough.
• dsr. Allowed values are negate, assert and passthrough.