There are two diffrent stories about this on the web: One says, that there are only mechanical diffrences, like the connector case (so the 7110 can open its slider) and the cable lenght. The other one says, that the former DLR-3 cable wasn't compatible with the new phones.
However, if searching for a DLR-3, its most likely that you really mean a DLR-3P.

That they contain a programmed microcontroller acting as RS232-handshake multiplexer. Without knowing the MBUS-Protocol, it is not possible to build a cable. Thats why most sold non-original 6210/7110 cables are DAU9-clones, and will only work with SMS, graphics and ringtones but not with data connections.

	Phones w/o Wireless Data	Phone w/o integrated Modem	Phone w/ hardware Modem
Hayes AT-Commands	n/a	DAU-9 with Nokia Data Suite	DLR-3P cable
Nokia Utilities (backup, ringtones,...)	DAU-9 + NDS	DAU-9 + NDS	DLR-3P
Logomanager (SMS,Logos,Phonebook)	DAU-9	DAU-9	DAU-9, DLR-3P
Unlocking	DAU-9 M-Bus	DAU-9 M-Bus	DAU-9 M-Bus
Oxygen	DAU-9	DAU-9	DAU-9, DLR-3P
Linux	Gnokii, w/o Wireless Data	Gnokii, beta!	DLR-3P directly

You can everything you can do with a DAU-9P F-Bus cable, plus you can talk OS-independent Hayes compatible AT-Commands directly over the serial RS-232 connection. You can make wireless data connection (ex. Internet on the road) without an additional Software-Driver and you can use all the Nokia-Utilities from theire Homepage (Backup-Restore, Logoeditor, MIDI-Converter,...)

You can only use it for phones with an integrated Modem, like the 6210, 6250, 6310, 7110,....

Sorry, here in Europe, I have no way to get in touch with Nokia TDMA-Phones. However, most of them have GSM counterparts. They often have things in common like connectors, Protocols, etc.
One thing that does not match that often is the integrated Modem. While all GSM 51xx and 61xx Series need a Software Modem (Nokia Data Suite) there are TDMA-Versions of 51xx and 61xx that have an integrated hardware Modem and therefor need a DLR-3P cable. They are mostly identified by the appended "i" in the Name.
62xx and 71xx Series usually have the Modem integrated.

Please write a small summary on your Site (if you like) and link for the rest to me.
I've spent a lot of time in investigating and testing the whole matter. Honour it that way. Thank you.

use a Shottky diode, not at 4148.

cables shorter than 1,5m do not need to be shielded.

When using a crystal, the two capacitors can have any value between 20 and 33pF.

If the Vcc is switched on and off by the phone at about 1Hz than you have check the MBUS connection.

Use ceramic capacitors, this will save you problems with the unusual polarisation of the max3232 (negative charge pump).

Seems like the BAT4x - Series are less known in the USA, so use an 1N5817 instead.

As a matter of fact, that is not necessery. It just happend that the night I've started the Project the first thing I've found was a 8 Mhz resonator. My personal cable does use 4 Mhz resonator now.
PS: I've never noticed any problems in overclocking the 4 Mhz-version of the PIC16F84 :)

The orignial parts are hard to solder, hard to get on a single piece basis and you will need a PCB in all cases. While this may be interessting for commercial products, this is not my goal. My Goal is to enable a medium skilled hobbyist to build this cable at home.

If you look a little bit around for the cheapest parts, you should be able to build this cable for apx. 300,- ATS (apx 40 DM = 20 Euro) in Europe. (We have a much higher price level on single parts than for example the US has! :( )
My guess is, that you could build in the US for apx. 10 USD (= 12 Euro).

Sorry, can't / won't give you anything on that, except that you will need a DAU-9 MBUS cable not a DLR-3p. And don't try 6110/5110/3210 unlockers: They will most likly render your Phone useless.
Stop bothering me.

As described on the welcome page, I've tested this cable with diffrent software. The only software that can make troubles with Version 1 or Version 2 is Oxygen Phone Manager. If it is not working, try starting Logomanager first, wait until it finds your phone, exit and start Oxygen.

Only the 51xx,61xx, 62xx and the 71xx Series have a full data connector on the bottom of the case. They either are either "Data Ready" phones (need a Software-Modem; DAU-9) or they have an integrated Modem (need a DLR-3p for wireless Data).
All other Phones (except Communicator) have the data connector below or beside the battery. You will need special connectors for that phones, and you are limited to SMS,Ringtones, Logos and that stuff.

Send, Receive and Read SMS with Terminal Program (Nokia Tutorial,PDF)
Unfortunally there is no detailed AT-Command Reference for the 6210, so try the following ones:
AT Command Set for Nokia Data Suite 3.0 (Nokia,PDF, short)
AT Commands for Nokia Card Phone 2.0 (Nokia,Windows Help / ZIP)
AT Command List for Card Phone 1.0 (Nokia, Windows Help / ZIP)
AT Command Reference for GSM Nokia Data Poroducts (Nokia, PDF 870kb, most phones implement only a subset)
AT Extentions for GSM (German, HTML)

Download the PC-Suite from Nokia and use the Dialog-Box from the Control Panel. Your GSM & Internet-Provider must support this, and there must by enough free channels to use this feature.

Try AT+CRC=1
This enables the extended RING-Messages, and should tell you even about Voice-Calls. (There seem to be several people where this anwser didn't help. This may have to do with the GSM-Operator or the Firmwire-Version. If you are one of them, send my your Operator, Country, Type of Phone and your Firmware-Version *#0000#. thx)

No, you can not connect your build-in computer-modem with an RJ11 to your phone; and   No, you cannot connect the RS232 directly to your phone without all this "annoying electronics stuff" in between. :-)

Once a while, I'm getting Job-offers via eMail - please write only, if you can offer me a Job for a limited time (3-12 months) in a Country like GB, USA or Canada.

... please make a Photo and send it to me as JPEG, along with Information, where you're from, or whatever appears importand.

Double check you curcuit!

dc@atrox.at