Phytec kitCON-161CS, Hardware Manual

Page: 26 / 62

kitCON-161CS/JC/JI
20

PHYTEC Meßtechnik GmbH 1999 L-356e_2
3.7 Pin Row X1 (RS-232_1)
Pin row X1 is located behind DB9-socket P1 and carries the signals of
the second serial interface
1
. The pinout is shown below:
X1
Pin 3 = GND
Pin 2 = TxD1
Pin 1 = RxD1
Figure 13: Pinout of Pin Row X1
3.8 The connectors PFO and WDI
The connectors WDI and PFO provide two additional signal inputs/
outputs. They are carried out as soldering holes in order to enable the
mounting of test pins.
The WDI connector extends directly to the watchdog input of the
watchdog device 694. The watchdog controls the input of the
watchdog timer. As long as this connector is left open (i.e. the WDI
pin is floating) the Watchdog Timer is disabled. If WDI is driven to
either high or low level the Watchdog Timer is started. Reset is
executed, if there is no further transition for the watchdog time-out
period (see the LTC694 data sheet for further information on the exact
timing of the Watchdog Timer).
The PFO connector extends directly to the power failure output of the
watchdog device 694. PFO can be used to monitor the condition of
the battery back-up or to indicate a power failure at VCC (i.e. VCC is
below the battery voltage) (see the LTC694 data sheet for further
information on the exact functioning of PFO and the trigger-levels).
1
: The availability of this interface depends on the controller mounted on the kitCON-
161CS/JC/JI.
1
2
3