APC 66097 Installation Manual download pdf (Page 18)

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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.

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").

"Single-unit" type installation

Settings

JBUS / RS485

PowerServices TelPac

UPS

Phone

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

The RS485 shielded 2-wire link

◗ Slave number x

◗ Without bias

◗ With impedance matching

◗ 1200,8,N,1

◗ Master

◗ With bias

◗ Without impedance matching

◗ 1200,8,N,1

UPS with JBUS/

RS485 card

PowerServices

Telpac

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APC 66097 Installation Manual Page 18