Power On Configuration(Jp1); Channel-Freeze Function (Jp2) - Advantech PCI-1756 User Manual

3.2.2

Power On Configuration(JP1)

Default configuration after power on, and hardware reset is to set all the isolated out-
put channels to open status (the current of the load can't be sink) so that the external
devices will not be damaged when the system starts or resets. When the system is
hot reset, then the status of isolated digital output channels are selected by jumper
JP1. Table 3.2 shows the configuration of jumper JP1.
Table 3.2: Power on configuration after hot reset (JP1)
JP1
1
1
3.2.3

Channel-Freeze Function (JP2)

The PCI-1756 provides the channel-freeze function for isolated digital output chan-
nels. When Channel-Freeze function is enabled, all ports on the card will be locked
so that the data transmitted (from the host PC) to the card won't be transferred to the
DO ports. Once the Channel-Freeze function is enabled, each port status is immedi-
ately frozen into its last valid value before the Channel-Freeze. Since the value trans-
mitted (from the host PC) to the card is also stored in the buffers on PC, users can
call the relative function to read back the DO channel value, this function will deter-
mine that:
If Channel-Freeze function is disabled, it will return the DO value on the port

 If Channel-Freeze function is enabled, it will return the value from the buffers on
host PC
Refer to Table 3.3 for setting dry/wet contact of Channel-Freeze function.
Table 3.3: Dry/Wet Contact of Channel-Freeze Function (JP2)
JP2
PCI-1756 User Manual
Power on configuration after hot reset
Default configuration
Keep last status after hot reset
Input Mode
Dry contact input mode
Wet contact input mode (Default setting)
20