User`s guide

A: BSC 3270 Line Control Procedures
DC 900-1340I 207
When the DSR/DCD signal returns, BSC sends the client the DLI_PROT_RESP_ERROR error
report containing the
DLI_ICP_ERR_DSR_UP information code, and normal line operation
resumes.
DSR/DCD up/down reporting is disabled when the modem control option is set to
HDX-2 or FDX-2.
A.7 Freeway/Line Interface
Freeway communicates to remote devices through serial connectors. The ports can be
connected to standard modem cables.
A.8 Modem Control Lines
Ta ble A –3 lists the EIA-232 modem control lines used by the BSC software.
Table A– 3: EIA-232 Modem Control Lines
Signal Pin Direction Description
RTS 4 Output For half-duplex, RTS is turned on just before
transmission is started and turned off when trans-
mission is complete.
CTS 5 Input CTS is checked after RTS is turned on but prior to
transmit. If CTS is on at this point, transmit is
started and further changes in the CTS pin are
ignored until the next block is ready to be trans-
mitted. If CTS is off at this point, transmission is
delayed until the CTS pin is turned on.
DSR 6 Input DSR is monitored by the BSC software and its sta-
tus is reported in the link status report.
DCD 8 Input DCD is monitored by the BSC software, and its sta-
tus is reported in the link status report.
DTR 20 Output DTR is turned on when the link is started and
turned off when the link is stopped.