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RS-232
The dimmPCI
TM
provides a 10-pin header terminal RS232 port on the backplane capable of
running at up to 230400bps. RS232 line drivers are integrated and no external components are
required. The RTS and CTS lines are usable on the DCE configuration of the RS232 port. The
DCD (Data Carrier Detect), DSR (Data Set Ready) and DTR (Data Transmit Ready) lines are not
implemented on the dimmPCI
TM
and are all connected to each other. The Ring Indicator line is
not implemented on the dimmPCI
TM
so no external serial devices can be intrinsically powered by
RS232 serial port.
The RS-232 10-pin connector is compatible with an insulation displacement connector (IDC)
DE9S (female 9-pin DB9 connector)
Figure 8. RS-232 Schematic
Watchdog
The watchdog on the dimmPCI platform can be used to protect the system and individual
processes. When the process or the system hangs, the watchdog will force a reset.
Highlights
• Based on the Dallas DS1832 (3V version of the DS1232) watchdog
• Uses ‘/dev/watchdog’ as do the normal Linux watchdogs.
• The number of seconds remaining until timeout is available by reading the device.
cat /dev/watchdog