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3. Configuration
3.1 A/B Switch Card Configuration
Figure 3.1.1 – Typical A/B Switch Card Front & Rear Panels
Each A/B Switch Card has an 8-position DIP switch, used to set the card’s address. Switch position 1 is the least
significant bit, and position 8 is the most significant bit. Set each switch position ON (as marked) for a '0', and OFF
for a '1'. Card address 1 for example, would be DIP switch position 1 OFF, and positions 2-8 ON. Card addresses
within a group must be unique.
Card address “00” is reserved and must not be used
. A typical approach is to set
the card addresses in each group to “01” and “02” from left to right within the group. The Controller Card
communicates with the individual switch cards using a multi-drop scheme. If two A/B cards within the same group
have the same address, both will try to respond at the same time, causing communication errors.
3.2 Controller Card Rear PC Board Configuration
Figure 3.2.1 – Controller Card Rear Panel Outline
The Controller Card rear pc board assembly has two jumpers for shielding and grounding options. The two 3-
position jumpers are positioned such that pin 1 is toward the card edge connector, and pin 3 is toward the RJ11
connectors. Each 3-position jumper has a 2-position shunt, used to connect two of the three positions together.
