aPbox Installation and Operations Manual
21
2
）
When one aPbox is installed on the line side of the FHP system, the communications
wiring figure is as follows.
Make sure the D
O
- and D
O
+
short connector
of TB3 are reliably connected, otherwise the
equipment will not work properly.
NOTE
•
The length of the communications cables between the aPbox and the
aGate X shall not exceed 328 feet (100 meters)
•
Use twisted pair cables for RS485 conductors.
•
Refer to Table 1 above for wire gauge recommendations.
DO- and DO+
short connector