User`s guide

96 DC 900-1340I
BSC Programmer’s Guide
mission is complete. In full-duplex operation (FDX-1 or FDX-2), the RTS signal is
turned on when the link is started and stays on until the link is stopped. In all cases,
transmission does not start until a clear to send (CTS) signal is received by the BSC soft-
ware.
4.14.2 DSR Signal
The modem control option allows a link to monitor the data set ready (DSR) signal.
With either the HDX-1 or FDX-1 setting, line activity ceases when the signal on the
DSR pin is lost. With either the HDX-2 or FDX-2 setting, the incoming DSR and DCD
signals are ignored by the BSC software. The HDX-2 and FDX-2 settings are useful for
half-duplex modems that toggle the DSR signal during normal link operation, or when
DSR may not be present. In all cases, CTS is used for permission to send data.
4.14.3 DCD Signal
The modem control option allows a link to use the data carrier detect (DCD) signal as
DSR. With either the HDX-2 or FDX-2 setting, incoming DCD signals are ignored by
the BSC software.
4.15 Safe Store Option (17)
The safe store option enables or disables the safe store capability of the BSC software.
See Section 3.4.1.8 on page 64 for more information about safe store.
Table 4–2: Modem Control Option Settings
Va lue Setting Description
0 HDX-1 Half duplex, monitor DSR
1 FDX-1 Full duplex, monitor DSR
2 HDX-2 Half duplex, ignore DSR and DCD
3 FDX-2 Full duplex, ignore DSR and DCD