APC 66097 Installation Manual download pdf (Page 19)

34003602EN/AB - Page 19

2. Installation

Impedance matching and bias settings

If a specific adjustment is required on the RS485 link, see the settings on DIP switch SA1:

Switch number

Function

T+ to R+ connection

T- to R- connection

T+ 0V bias

R+ R- impedance matching

Switch number

Function

R+ 0V bias

T- +5V bias

T+ T- impedance matching

R- +5V bias

Default position

◗ Master (fixed)

◗ Two-wire link

◗ Bias

◗ Without impedance

matching

Example:

SA1.6 = ON,

T- has a +5V bias,

SA1.6 = OFF,

T- does not have a +5V bias

Settings

JBUS / RS485

PowerServices TelPac

UPS

Phone

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

SA1

OFF

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APC 66097 Installation Manual Page 19