4.0 INSTALLATION
Once you have configured the Model 1225 transmitter and
receiver, you must connect the system. This section will tell you how to
connect the transmitter and receiver via twisted pair wire and how to
connect the two devices to your system hardware.
4.1 CONNECTING THE LINE SIDE
Depending upon the type of units you have ordered, you can
connect twisted pair wire to the Model 1225 using internal terminal
blocks (with strain relief) or modular jacks. The following pages
describe both kinds of twisted pair connection.
4.1.1 TERMINAL BLOCK CONNECTION
Terminal blocks are used to connect a single pair of bare wires to
the Model 1225. The following instructions will tell you how to open the
case, connect the bare wires and fasten the strain relief collar in place.
1. Open the unit by gently inserting a screwdriver between the
DB-25 connector and the lip of the plastic case (see below). You don't
have to worry about breaking the plastic, but be careful not to bend the
D-sub connector.
After you have opened the unit's case, you will find the terminal
block mounted at the rear of the PC board. The terminals are labeled
“S” for “signal” and “G” for “ground”.
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2. Strip the outer insulation from the twisted pairs about one inch
from the end.
3. Strip back the insulation on each of the 2 wires about .25”.
4. Insert the two-wire data line to the center (signal) and shield
(ground) terminal posts, then tighten the screws.
NOTE: Make sure the twisted pair cable between the transmitter
and receiver is wired
straight through as shown below:
SIGNAL (S)--------------------- (S) SIGNAL
GROUND (G)--------------------- (G) GROUND
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G S
