How to test the RS422 data lines coming from TXB-B for terminate or unterminated position.

DANGER

HAZARD OF ELECTRIC SHOCK.
Remove all power from all devices before removing any covers or doors of the system. Disconnect the power at the device and at the power source.

Issue

How to TEST data on TXB-B on Spectra that is termination or un termination.

Product Line

Pelco Cameras

Environment

  • TXB-B
  • TXB-AD
  • BB4DOORASSY
  • Volts Meter

Cause

Double termination on TXB will cause no ptz control.

Resolution

Here's how to test data lines with TXB-B plug into BB4DOORASSY:

  1. Set  volt meter to Resistance measurement.
  2. Put Red + onto RX+ and Black - onto RX- 

Note:  Terminate 54 Ohms and Unterminate 95 Ohms.