User manual

25 Chapter 4
Advantech Device Manager, as shown in Fig. 4-1. The second way is to
determine the board ID by its device number through DLL function,
DRV_DeviceGetFeatures( ). For detailed information, please refer to
software manual on CD-ROM.
Figure 4.1: Device Number and Board ID
4.2 Channel-Freeze Function
The PCI-1752U/PCI-1752USO provide the channel-freeze function for
isolated digital output channels. 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 immediately
frozen into its last valid value before the Channel-Freeze. Since the value
transmitted (from the host PC) to the card is also stored in the buffers on