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What are the differences between the Multi Communications Terminators MCT485, MCTAS485, and MCT2W?

Issue
Selecting the correct terminating resistor for RS485 serial daisy chain.

Product Line
Powerlogic and ION Meters, Other RS485 devices

Environment
Applications using a serial RS485 daisy chain

Cause
Need to terminate the end of serial RS-485 device chain.

Resolution
MCT485- Network Terminator Circuit Monitor, Part Number: 3090MCT485
- 1 100 ohm, .25W resistor in series with 1 .047uF capacitor used across RX+ to RX-
- 1 100 ohm, .25W resistor in series with 1 .047uF capacitor used across TX+ to TX-



MCTAS485 -Network Terminator PowerLogic Compatible, Part Number: 3090MCTAS485
- 1 100 ohm, .25W resistor in series with 1 .047uF capacitor used across RX+ to RX-
- 1 100 ohm, .25W resistor in series with 1 .047uF capacitor used across TX+ to TX-



MCT2W- RS485 Terminator for 2-Wire Daisy Chain, Part Number: MCT2W
- Old Version: 1 100 ohm, .25W resistor in series with 1 .047uF capacitor used across + to -
- New Version: 1 100 ohm resistor used across + to -


 
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