Digi TransPort WR44 - Abb;Elster Alpha Power Plus Meters; AMETEC Power Instruments Jemstar Meters

Meter Engineers Handbook for Cellular Communication 14
4.5 ABB/Elster Alpha Power Plus Meters
Identical to Elster A3 Meters in section 5.1. Requires optional RS-485 communications board.
4.6 AMETEC Power Instruments JEMStar Meters
Requires the optional RS-485 board. Half Duplex (two wire) RS-485 only. 120 ohm termination resistor is not
required at the Digi TransPort WR21 end of the cable. The Digi TransPort WR21 has an internal termination resistor
that is soware selectable. It is necessary at the meter end.
RS-485 Output Connections Switchboard RS-485 Output Connections
Color Signal
Terminal Signal
Wht/Grn/Blu XMT/RCV -
21
XMT/RCV -
Wht/Grn/Blu XMT/RCV +
22
XMT/RCV +
For Switchboard style meters, the connections are provided on terminal blocks.
JEMStar Digital Multifunction Electricity Meter User Manual. Pub: 1083-600 Rev S. Pgs. 50, 55