MGE UPS Systems 100 Setting up the RS485 link, General, Single-unit type installation

2. Installation

2.6 Setting up the RS485 link

General

For UPSs equipped with the PowerServices TelPac external version (see table section 2.3 "The various installation types"), communication between the UPS and the external unit is achieved via a RS485 link in 2-wire mode.

The link works using the master-slave mode, with the PowerServices TelPac always being the master.

Standard practice is to add line bias at the network master and impedance matching at the end of the line on the slave side.

The line must only be biased at one point.

"Single-unit" type installation

The external unit is pre-configured to be directly operational. No special configuration is necessary for a "Single-unit" type installation of the external unit with a Galaxy or Comet type UPS.

Configuration of communication parameters (mode, rate, etc.) is carried out on the RS485 cards on the respective UPSs (see "Configuring the RS485 card for Comet" or "Configuring the RAUZ card for Galaxy").

UPS with JBUS/	PowerServices
RS485 card	Telpac
◗ Slave number x	◗ Master
◗ Without bias	◗ With bias

Phone

Settings

JBUS / RS485

◗With impedance matching ◗ Without impedance matching

◗ 1200,8,N,1 ◗ 1200,8,N,1

CD

UPS

A 5V B R+ R- T+ T-

TelPac

The RS485 shielded 2-wire link

Page 18 - 34003602EN/AB