Installation guide

Page 26 of 206 Installing the hardware
553-3601-220 Standard 4.00 November 1998
Figure 11 : Opening the RPI cover
Wiring the RPI unit
The maximum two-way (between the RPI and the Base Station) dc loop
resistance for power pairs is 90 ohms. Each Base Station needs one or two
power pairs. The exact number depends on the wire size of the power pairs and
the distance between the Base Station and the RPI. Table 3 shows the
approximate maximum cabling distances. Remember that interconnections
increase the loop resistance.
WARNING!
Do not run unprotected power cables
outdoors.
The outputs of an RPI unit should not be
wired so that its lines are exposed.
Table 3 : Maximum cabling from RPI to Base Station
Wire size Single-pair Double-pair
0.6 mm (22 AWG) 800 m 1200 m
0.5 mm (24 AWG) 500 m 1000 m