User manual

Register Definitions B
E6198B Switch/Load Unit User Manual B-23
Agilent U7177A 24-Channel Medium-Current Load Card With Current
Sense
The Agilent U7177A Load Card is designed for moderate
current loads mounted outside the load card. The card provides
current sense, pull-up/down selection, Card Type, Card
Configuration, and Status readback of the built in relay timers.
See “Using the Agilent U7177A 24-Channel Load Card" for more
information.
Register definitions for the card are as follows:
Card Type (R) Base + 0h
This register reads back the Card Type (18h) of the card.
• Read Only
• Power On/Reset State = 18h
Card Configuration (R) Base + 1h
This register reads back the Card Configuration. The Card
Configuration is determined by the user to distinguish different
load configurations of the same load card Card Type.
• Read Only
• Undefined bits readback as all 1s
Status (R) Base + 2h
This register reads back the card's status. Currently the status is
defined as the state of the relay timer. The relay timer has two
timers wire-OR'd together. One timer is designed for the slower
armature relays (>8 ms) and the second designed for the faster
reed relays (>500
μs). The timers restart whenever the registers
Bit 7-0
Purpose
Card Type
Setting 18h
Bit 7-0
Purpose
Card Configuration
Setting state