User`s manual

Chapter 3 Jumpers and I/O Connector 13
Figure 3-2: Jumper settings for PCI-1720’s current sink range
Note!: In order to maintain accurate outputs for your field
applications, it is important that you calibrate the PCI-
1720’s variable resistors (VRs) from time to time.
Calibration instructions are provided in Appendix A.
3.1.2 Jumper JP5 Setting for the Reset State
Jumper JP5 gives the PCI-1720 a new and valuable capability. With
JP5 enabled, the PCI-1720 “memorizes” all D/A output settings and
output values, and, in the event of a “hot” reset, i.e., the power is not
shut off, the settings and output values present at each channel just
prior to reset are still maintained. This feature is very useful for user’s
field applications. For example, it may allow a computer be “hot”
reset without requiring the whole control system to shutdown. (Since
output values are left unchanged.)
Complete loss of power to the card clears all settings and output
values even if JP5 is enabled; i.e. if the power to the card is discon-
nected, the card’s initial power-on state will be the default state. The
default state is the output range for all channels is 0 ~ 5 V and all the
output values are 0 V.
JP1 to JP4
0 ~ 20 mA
4 ~ 20 mA