Installing the hardware Page 27 of 220
Meridian Companion Installation and Maintenance Guide
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 75 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
22 AWG
2,500 ft
4,000 ft
24 AWG
1,500 ft
3,000 ft
Содержание Meridian 1 PC Console Interface Unit
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Страница 78: ...Page 68 of 220 Installing the hardware 553 3601 200 Standard 7 00 November 1998 ...
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Страница 128: ...Page 118 of 220 Programming user options 553 3601 200 Standard 7 00 November 1998 ...
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