User manual

Using Load Cards and Loads 5
E6198B Switch/Load Unit User Manual 5-89
• The mezzanine cards plug into the 1-3 upper and 1-3 lower
positions on the load card. The channel number depends on
the placement of the mezzanine card. You can also read the
channel assignments from the printing on the front or back
of the load card. (You may need to hold the load card at an
angle to see the printing from the front when the mezzanine
cards are installed.)
• The Mezzanine ID pins are located in pairs numbered 1-4 at
the top of the card. This lets you identify each mezzanine
card using a four-digit binary number (least-significant digit
on the left at ID 1) that you can read back through the
interface using the loadCardGetInfo action. (See the TS-5000
System Software User’s Guide for more information.) All
four bits are pulled to a high state on the load card PCA, so
the default readback value is 0xF
h
. The left pin of each pair is
the digital input, and the right pin is ground. Shorting a wire
across the pair pulls the bit to the low binary state.