User's Manual

B-2
To add additional Relays, you must “multi-drop” them off a single bus line
running from the RELAY port on the Base station. See the section below
for cabling requirements and pin-outs. It is very important to follow the pin-
out directions carefully and to use the suggested cable type. The majority
of problems we see are the result of incorrect wiring.
Each Relay requires it’s own power supply. There is no serial parameter
setup required on a Relay as it is transmitting only to the Base station and
not directly to a serial port.
Routing the Wiring
The below diagram illustrates the RIGHT way to route your wiring and
which units should be terminated. Notice this is the classical bus interface
where the Base and Relays are connected to a “one-cable bus”. The bottom
of the Y-Cables is connected into the unterminated base or relay(s). Notices
that the two end units are terminated; the units in the middle are
unterminated, including the Base in this example.
Correct Routing for Wiring