Multi-Tech Systems FR111 - Manual (Page 74)

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The EIA Pass Through option allows the data device to receive EIA
control signals through the MultiFRAD. This option only applies during
the async mode of operation. Since, in normal interactive operation, the
existence of a MultiFRAD should be transparent to the user, the EIA
pass through option allows a terminal to operate as if it were connected
directly to a communications line and not through a MultiFRAD. This is
done by allowing selected pins (signals) on one MultiFRAD to be
passed through to selected pins on a remote MultiFRAD. The default
condition is for this option to be turned off. The following diagram shows
how the EIA pass through option routes the selected signals:
Trunk Facility
IN 4
IN 20
OUT 8
OUT 6
8 OUT
6 OUT
4 IN
20 IN
MultiFRAD
A
MultiFRAD
B
The Pass Xon option enables the XON/XOFF flow control signals to be
passed on to the data device. This option only applies during the async
mode of operation. This option has to be used in conjunction with the
software-based XON/XOFF flow control option. The default condition is
for this option to be turned off, and normally it should remain off.