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Bacnet Ms/Tp Wiring; Connecting Class 320 Meters To Usb Key Using Rs485 - Honeywell Class 320 Meter Installation Instructions Manual

Class 320 advanced kwh/demand meter
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CLASS 320 METER

6.11 BACnet MS/TP Wiring

BACnet MS/TP wiring is the same as Modbus and EZ7 wiring. See Sections 10 and 11
for instructions on changing I.D. and IP addresses.
6.12 Connecting Class 320 Meters to USB Key using
RS485
The USB Key plugs into the PC's USB port and provides a termination point for the
RS485 wiring from the meters. Up to 52 meters can be "Daisy chained" with up to 4000
feet total RS485 wiring. The USB Key is labeled for "plus (+)", "minus (-)", and ground
and the wiring must match the same positions on the meters. If more than 52 meters
are to be monitored, additional USB Keys can be utilized to connect them to the PC.
Fig. 19. Connecting Class 320 Meters to the USB Key using RS485.
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