Are there pull-up/pull-down resistors on the RS-485 port in the ACX57xx controllers?

Issue

Having communication issues with Schlage PIM devices attached to ACX2's 485 port.

Product Line

Andover Continuum

Environment

ACX57xx

Cause

Documentation

Resolution

The ACX57xx RS485 port has 47K resistors on the +/- lines. The 47K on the plus line is pulled up to 3.3v. The one on the minus line is pulled down to ground.

They are both 1/16 watt resistors.