How to detect the RJ-45 cable plug in or not ?

odinfang68 · Joined: 12 Oct 2005 Posts: 11

I need a function to know whether the cable plug in or not ? Can anybody help me ? thanks.

bzijlstra · Posted: Tue Mar 07, 2006 6:52 pm Post subject: Signal on link ethernetcontroller

If I look at the WebTiger from www.achatz.nl and unplug the RJ45 cable, I see the LINK-led going off. So I think it should be possible to check if a cable is inserted and if there is a link to a switch.

Perhaps check the datasheet of the ethernetcontroller. Specially the LED's. Perhaps you can connect this signal to an input on your microcontroller.

Have fun
Ben Zijlstra

george2002 · Joined: 23 Nov 2005 Posts: 74 Location: Krakow

in my opinion ther are two options to check is there connected cable Smile

first option is to connect to microprocesor to rtl8019as pin60 or 61 or 62 or 63 because that pins are showing status of connection but i dont know which led showing it Razz

second idea is to ping some ip adress and when ping is working then cable is connected and when there is no ping then cable is not connected but in this option pinged computer/slave device must be on whole time Smile

ps
sorry for my poor english Very Happy

regards
george2002

odinfang68 · Joined: 12 Oct 2005 Posts: 11

I use W3100A Pin36 "/Link" for Input pin. It can work very well.