| ??? 07/22/03 19:10 Read: times |
#51142 - RE: RS 485 auto termination Responding to: ???'s previous message |
Perhaps a 74HCT4066 will do the trick?
When you use a +9V power suplly one switch has a resistance of 35Ohm. Place 3 or more switches in parallel and you will get the desired 10 Ohms or less. the datasheet is here : http://www.semiconductors.philips.com/acrobat/d...4066_4.pdf A disadvantage : level shifting between microcontroller and 74HC4066 Maybe 4 switches on +5V power suplly will also get you were you want. Another option : a reed relais? |
