Multi-Tech Systems FR111 - Manual (Page 59)

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Parity
The Parity parameter sets parity for odd, even or none. Under normal
conditions, parity is set to none. The default is none.
Stop Bits
The Stop Bits parameter sets the number of stop bits. The number of stop
bits can be 1, 1.5, or 2. The default is 1 bit.
Flow Control
The Flow Control parameter allows for two types of flow control: the
software-based XON/XOFF and the hardware-based Clear to Send (CTS).
The default is CTS. Flow control is the means by which data flow from the
device into the MultiFRAD is controlled. Flow control is necessary when the
data handling capacity of the data port cannot keep up with the volume of
data sent to it. When the data device controls data flow to itself, it is called
pacing (see Pacing). The combination of flow control from the port device
and pacing to the data device is how data transfers are regulated so that
no data is lost.
DATA DATA
Channel
Device Channel
Device
CHANNEL DEVICE-
INITIATED PACING
Pacing stops the output of
data from the MultiFRAD Flow control stops the input
of data to the MultiFRAD
MultiFRAD-INITIATED
FLOW CONTROL
MultiFRAD MultiFRAD
Pacing
The Pacing parameter controls the data flow to the data device. Pacing is
necessary when the flow of data to a device operating on the data port is
more than it can process. If the device cannot process the volume of data
sent to it, then the pacing option should be turned on. The pacing method
used is determined by the type of flow control. The default condition is for
this option to be turned off.