Rs485; About Rs485; Connecting Rs485 - PrimeVOLT PV T U Series Installation & Operation Manual

7.3 RS485

7.3.1 About RS485

A typical RS485 connection is as below.
Some Noteworthy Points:
1. Wires between devices and computer shall be twisted.
2. Maximum allowable wire length is 1000 meters.
3. The terminal-end device should have a terminal resistor.
4. Due to multiple connections, each individual device should be
assigned an IP address as to send/receive.

7.3.2 Connecting RS485

Wiring Diagram

Inverter (1)
RS485 connector
ON
1
Pin:Off
T/R + ↔ T/R1 +
Inverter (2)
RS485 connector
ON
1
Pin:Off
T/R -
T/R +
T/R - ↔ T/R1 -
Connecting to device or computer
with RS485 interface
Inverter (last)
RS485 connector
Pin:On
RS485<->RS232
RS232 to RS485 board or
External data logger
44
ON
1
RS232 Cable