_____ | _ | | | | | | | | | \ \/' / \_/\_\
______ |___ / / / / / ./ /___ \_____/
_ _ | | | | | |__| | | __ | | | | | |_| |_|
_ | | | | | | | |____ |______|
_____ / ____| | | | | | |____ \_____|
IMPORTANT: enter the case-INsensitive alphabetic (no numbers) code AND WRITE SOME SHORT summary of changes (below) if you are saving changes. (not required for previewing changes). Wiki-spamming is not tolerated, will be removed, so it does NOT even show up in history. Spammers go away now. Visit Preferences to set your user name Summary of change: http://img231.imageshack.us/img231/6965/obd4cw.th.png [http://img231.imageshack.us/img231/6965/obd4cw.png Big image] Your load resistor is 100 Ohms. C12, in series with the 100 ohms wants to have an Xc of a lot less than 100 ohms (less than 10 ohms is good) at the baud that you will be using. Many similar circuits replace the capacitor with a short-circuit. The purpose of the capacitor is to reduce power consumption when there is no data flowing. If it were me, I would use a 10uF (because I have a lot of them in my parts bin!)although many different values would probably work well. Thanks! I'll try a 10uF then, using 100nF now.. There must be something else wrong with the whole circuit (this image is just a piece of it) RXD and TXD connects to a PCA82C250 and then to CAN bus, it communicates but seems to lose data... Try replacing c12 with a short circuit temporarily to see if that helps clear up the lost data problem. --- Uploaded the whole schematic --- Tried with shorted C12,C13 , tried without short, same result (100nF) - Also didn't use C8-C11 Got an CAN error on selfcheck but when i switched U3 & U5 it was gone.. :/ It dosen't seems like a complicated circuit to duplicate but I have no luck... --- Optional: Add document to category: Wiki formatting: * is Bullet list ** Bullet list subentry ... '''Bold''', ---- is horizontal ruler, <code> preformatted text... </code> See wiki editing HELP for tables and other formatting tips and tricks.