Digi TransPort WR21 - Connecting the Digi Transport WR21 to RS-485 Meters; Pinouts of Various Meter Types; GE KV2 C Meters

Meter Engineers Handbook for Cellular Communication 8
3.4 Connecting the Digi TransPort WR21 to RS-485 Meters
–
Similar to the RS-232 instructions, set up the Listening Port and the Port Forwarding rules and ensure the IP
Address and Port are enabled for PPP 1 interface. For pinouts from the various types of meters to the DB9 of the
Digi TransPort WR21 see below in section 4.
–
The DB9 of the Digi TransPort WR21 is software selectable for either RS-232 or RS-485. To configure it for RS-
485 communication, go here in the WebUI: Configuration-Network>Interfaces>Serial>Serial Port 0. Drop the
Advanced tab down and in the Async Mode: box select RS-485. Terminating resistors are software selectable if
needed, there is no need to put external terminating resistors in place.
Pinouts of Various Meter Types
4.1 GE KV2C Meters
Cable Pinouts to Connect KV2 Meters to Digi TransPort WR21
4
8
7
4
5
1
1
6
Digi TransPort WR21 Cable to KV2 Meters
9
6
3
5
4
3
2
2
WR21
DB9 (Male)
KV2 Meter
RJ11 Connector
Red R+ (out)
Black R- (out)
Green T- (in)
Yellow T+ (in)