I used a 4.7K for my system. I think that the higher the resistance, the slower your baud rate is going to be. Best bet is to put it on a scope and try a couple different resistors. watch for rounding on the corners. --Joe pic microcontroller discussion list wrote on 04/22/2004 02:03:51 PM: > I would like to thank everyone for taking their time and answer. The MAX323 > is going to work wonderfully for me (I have downloaded the datasheet). > About the pull-up resistors, can I use 100K for low power consumption or > should 10K be fine? > > -----Original Message----- > From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU] On > Behalf Of Joe Jansen/TECH/HQ/KEMET/US > Sent: Thursday, April 22, 2004 5:35 PM > To: PICLIST@MITVMA.MIT.EDU > Subject: Re: [PICLIST] [EE:] 2 RS232 connections on 1 RS232 port > > I did this recently, using 2 MAX323 chips to isolate the 2 ports. The > MAX323's went between the pic and the MAX232. This also gave me the > advantage of being able to select which port I wanted to listen to at any > given time, and sending was isolated as well. Remember to use pullup > resistors between the 323 chips and the pic! > > --Joe Jansen > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics