ADM3491: Is resistor Rt needed between Y and Z (transmitter side) or only on the receiver side?

Document created by analog-archivist Employee on Feb 23, 2016Last modified by analog-archivist Employee on Feb 23, 2016
Version 2Show Document
  • View in full screen mode

The ADM3491 datasheet figure 33 shows the the application circuit for full
RS485, is it correct to place a resistor Rt between Y and Z ? Usually I would
place a Rt on the receiver side not on transmitter side.


In a full duplex configuration only the master receiver and most remote slave
receiver need to be terminated. Please see Figure 4 in the attached RS-485/422
Circuit Implementation Guide AN-960.