Worth Data RF Terminal 7000 - Manual (Page 81)

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. Keep in mind
that the maximum total cable length from end-to-end is 4000' for good quality twisted pair wire.
Correct Routing for Wiring
The next diagram illustrates the WRONG way to route your wiring and use the Y-cables. Sometimes people try
to route everything through a panel or wiring closet – this will not work properly; it will generate excessive data
noise and drag down the responsiveness of the Base and application. (With too much noise, the Base will stop
working and issue a “Base Station Reinitalized” message to the terminals. If used, such a radial interface as
below might appear to work most of the time, but it would be very sluggish and crash several times per day.
Terminating or not terminating will be of no help. Do Not cable as shown below:
Incorrect Routing for Wiring
Relay Station RS422 Pin-outs
The RF Relay Stations are connected by twisted pair wire -- use Belden 1227A1, Cat 5 wire, or
equivalent. The “Relay” port on the Base Station and the “Relay” port on the Relay Station are connected
with a straight cable using the following pin-outs: