ELM Electronics - Connections

The following products are in the broadly termed Connections family. Many are for connecting RS232 (computer) devices to Automotive (OBD), Infrared, or Control L (LANC) circuits, but you'll find some other interesting ones too.

ELM320 - OBD (PWM) to RS232 Interpreter
ELM322 - OBD (VPW) to RS232 Interpreter
ELM323 - OBD (ISO) to RS232 Interpreter
ELM327 - OBD to RS232 Interpreter
ELM339 - Infrared Remote Control
ELM621 - Serial Three Bit Port
ELM622 - Infrared Remote Interpreter
ELM624 - Control L (LANC) to RS232 Interpreter
ELM626 - RS232 Break Detector
ELM627 - RS232 Break Detector
ELM630 - LIN Monitor
ELM633 - 19200bps miniLIN Monitor
ELM634 - 9600bps miniLIN Monitor

ELM339 - Infrared Remote Control		Data Sheet
	Use an inexpensive television remote control to control up to three separate devices. Handy if you just want to start up your shop vacuum, or turn off the lamp next to the television. This IC can't drive power line level outputs directly, but with suitable relays or triacs it will provide all the control you are likely to need.
	Available in: 8-pin PDIP $8.50 CDN, 8-pin SOIC $10.00 CDN

ELM622 - Infrared Remote Interpreter		Data Sheet
	This circuit receives Sony® TV remote control codes from an IR module, and retransmits them as serial ASCII data to a microcontroller or PC. Great for use as an alternative input device for control applications, or as a hidden enabler/disabler for security systems. Visit the Linux Toys web site to see a complete implementation - the "X Infrared Remote Control". Linux users will appreciate the software provided for converting the ELM622 codes to X-Window keycodes.
	Available in: 8-pin PDIP $9.00 CDN, 8-pin SOIC $10.50 CDN

The following four devices are for use with vehicles that have an OBD or On Board Diagnostics port. This port is required on any 1996 or newer North American vehicle, and is used to obtain 'trouble code' information, as well as other things. For more information, see our Auto Info pages.

Often, we are asked if we can provide circuit boards, J1962 connectors, or more user-friendly software to use with these auto ICs. Unfortunately we only sell the ICs - but have you tried the people at ScanTool.net? They offer all of the above, and their prices seem quite reasonable. Their site is http://www.ScanTool.net

ELM320 - OBD (PWM) to RS232 Interpreter Data Sheet

320 The ELM320 allows you to talk to your 41.6KHz J1850 PWM OBD (On Board Diagnostics) equipped vehicle through a standard RS232 serial connection, using only simple ASCII commands. This updated version remains just as easy to use, but is now completely programmable, allowing even more control, and of course possibilities.
As before, the user need only issue the desired commands - the data formatting, error checking, bus arbitration, etc. is all handled by the ELM320. If you presently use one of our v1.x ICs, you will be pleased to know that this version (v2.0) is pin-compatible with the old (the only difference at power-up is that linefeeds are now on by default). Simply unplug the old and plug in the new.
This IC only supports the 41.6KHz J1850 PWM data format which is typically used in Ford Motor Company vehicles. If you have a different vehicle, please refer to our ELM322 and ELM323 products.

Available in: 8-pin PDIP $16.50 CDN, 8-pin SOIC $18.50 CDN

ELM322 - OBD (VPW) to RS232 Interpreter Data Sheet

322 Similar to the ELM320, and also completely revised, the ELM322 is for connecting to an OBDII equipped vehicle which uses the 10.4KHz J1850 VPW format. This standard is typically used in General Motors Corporation and some DaimlerChrysler vehicles. The user need only issue the desired commands through an RS232 serial connection and the data formatting, error checking, bus arbitration, etc. on the vehicle side is all taken care of by the ELM322. This allows experimenters to inexpensively create their own 'scan tool'. If you presently use one of our v1.x ICs, you will be pleased to know that this version (v2.0) is pin-compatible with the old, so you can simply replace your IC if you want to upgrade.

Available in: 8-pin PDIP $16.50 CDN, 8-pin SOIC $18.50 CDN

ELM323 - OBD (ISO) to RS232 Interpreter Data Sheet

323 The ELM323 completes our trio of OBDII ICs, allowing you to talk to your ISO 9141-2 or ISO 14230-4 standard OBDII equipped vehicle using an RS232 serial connection. It transparently converts between a 10.4KHz ISO data stream and standard ASCII characters, allowing trouble codes and operating parameters to be easily retrieved without the need for special software. No knowledge of data formatting, error checking, bus initiation etc. is needed either, as the ELM323 handles all of it for you.
The present version of the ELM323 (v2.0) provides several programmable features that the previous versions did not offer. It now allows programmable header bytes, adjustable timeouts, the ability to report in the packed data mode, and offers a special monitoring mode as well. This is in addition to all of the capabilities that the v1.x ICs offered - the full seven byte command structure, two line (K and L) initiation, software selectable linefeeds and character echoing, and the visual feedback provided by the four LED outputs.
If you currently use one of our v1.x ICs, you will be pleased to know that this version (v2.0) is pin-compatible with the old, so you can simply replace your present IC with one of these, and immediately begin enjoying these new features.

Available in: 14-pin PDIP $17.50 CDN, 14-pin SOIC $19.50 CDN

ELM327 - OBD to RS232 Interpreter Data Sheet

327 We've improved our best OBD Interpreter, so now it's even better! The new v1.2 IC adds 3 new CAN protocols, and now offers more that 70 AT Commands, and almost 30 Programmable Parameters. In addition to the CAN (ISO 15765-4), SAE J1850 PWM, SAE J1850 VPW, ISO 9141-2 and ISO 14230-4 support, we now offer some support for J1939 CAN as well.
Just as with our other OBD ICs, the ELM327 transparently converts OBDII data into standard ASCII characters, allowing trouble codes and operating parameters to be easily retrieved without the need for special software or hardware. No knowledge of data formatting, error checking, bus initiation etc. is needed either, as the ELM327 handles all of that for you. You don't even need to know what protocol your car 'speaks', as this IC automatically detects that for you.
In addition to the improved protocol support, we think that you will also enjoy some of the other enhancements. For example, the new Adaptive Timing feature actually monitors the time it takes your vehicle to respond to queries, and continually adjusts the response timer to suit the current conditions. This feature is normally enabled, so you don't have to change your software or make any settings changes to enjoy the faster data transfer rates.
One other very significant improvement is with the serial (RS232) interface. It has been completely updated, and now offers baud rates of up to 500 Kbps! You can change rates temporarily with a software command, or make it more permanent with a Programmable Parameter.
There are many other features that you will only learn about if you download either the 'QuickSheet' (a 5 page summary), or the full (51 page) Data Sheet.
We are currently shipping version 1.2 of this IC.

QuickSheet

Available in: 28-pin PDIP $32.50 CDN, 28-pin SOIC $32.50 CDN

ELM621 - Serial Three Bit Port Data Sheet

621 Small control applications often only require a few port pins for outputs and feedback. This 8 pin circuit is perfect for these projects. It is controlled using a PC's serial port with standard 'AT' type commands, allows reconfiguration 'on the fly', and requires only a few external components for support.

Available in: 8-pin PDIP $9.50 CDN, 8-pin SOIC $11.00 CDN

ELM624 - Control L (LANC) to RS232 Interpreter Data Sheet

624 Control L or LANC is a standard interface for controlling audio and video devices. It is similar in some ways to RS232, but not enough to allow direct connection to your computer. By using the ELM624, the peculiarities of the interface are translated for you, allowing direct control and monitoring of your favourite A/V machines.

Available in: 8-pin PDIP $14.50 CDN, 8-pin SOIC $16.50 CDN

Be sure to visit Eric Cairon's 'ritonworld' web site for some great construction plans and software for use with this chip. This link goes directly to the English version of the site.
Nigel Ealand has used Eric's circuit board, and created a Visual Basic interface to interact with it. As well as offering a free interface program, he has posted the source code for download - be sure to visit his 'Ealing Sub-Aqua Club' site.
For those that don't mind paying for a solution, one source is Applied Logic Engineering. They offer bare boards, complete boards, and software, all for a reasonable price.

ELM626 - RS232 Break Detector Data Sheet

626 This circuit is designed for remotely resetting devices via an RS232 interface. It connects directly to the RS232 signal lines, requiring only a single resistor, and no external timing components. Complementary outputs and digital selection of break period help simplify circuit integration.

Available in: 8-pin PDIP $8.00 CDN, 8-pin SOIC $9.50 CDN

ELM627 - RS232 Break Detector Data Sheet

627 This circuit is similar to the ELM626 but also provides a single 100ms output pulse when powered up. Ideal for many small systems.

Available in: 8-pin PDIP $8.00 CDN, 8-pin SOIC $9.50 CDN

The LIN (Local Interconnect Network) bus is an emerging standard for low speed communications and control in automobiles and major appliances. It's a single master/multiple slave system that uses only three wires for power and data flow. The potential cost savings possible from adopting such a system is proving to be a major incentive for manufacturers, and has led to its rapid acceptance.

For more information, please refer to the LIN Consortium web site:
http://www.lin-subbus.de/

ELM630 - LIN Monitor Data Sheet

630 This IC is a full-featured general purpose monitoring device for use on all LIN systems. It has recently been updated so that it is now compatible with the newer (rev 2.0) LIN specification, as well as older (rev 1.x) systems.
The ELM630 is a very useful general purpose LIN integrated circuit that is able to automatically adjust to all of the standard LIN speeds (from 1200bps to 19200bps). It is able to simultaneously retrieve LIN data, check both classic and enhanced checksums, format the data as ASCII characters and transmit it to an RS232 serial device (a PC or PDA). It will prove useful in many monitoring, troubleshooting, or educational applications.

Available in: 14-pin PDIP $16.00 CDN, 14-pin SOIC $18.00 CDN

ELM633 - 19200bps miniLIN Monitor Data Sheet

633 For those that are only interested in the 19200bps LIN protocol, this device is for you. It is just as capable as the ELM630, but its smaller package size will be appealing to those that want to minimize the circuit size. It includes the special power-on to monitor mode, has the same very high speed (57600 baud) RS232 rate, and works with rev 2.0 as well as older rev 1.x systems, too.

Available in: 8-pin PDIP $14.50 CDN, 8-pin SOIC $16.50 CDN

ELM634 - 9600bps miniLIN Monitor Data Sheet

634 This IC is identical to the ELM633 in all aspects, except that it is for use on 9600 baud LIN systems. It connects to your computer or PDA at the same high RS232 speed (57600 baud), offers the same power-on to monitor feature, and is also compatible with the newest rev 2.0 systems.

Available in: 8-pin PDIP $14.50 CDN, 8-pin SOIC $16.50 CDN

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ELM320 - OBD (PWM) to RS232 Interpreter		Data Sheet
	The ELM320 allows you to talk to your 41.6KHz J1850 PWM OBD (On Board Diagnostics) equipped vehicle through a standard RS232 serial connection, using only simple ASCII commands. This updated version remains just as easy to use, but is now completely programmable, allowing even more control, and of course possibilities. As before, the user need only issue the desired commands - the data formatting, error checking, bus arbitration, etc. is all handled by the ELM320. If you presently use one of our v1.x ICs, you will be pleased to know that this version (v2.0) is pin-compatible with the old (the only difference at power-up is that linefeeds are now on by default). Simply unplug the old and plug in the new. This IC only supports the 41.6KHz J1850 PWM data format which is typically used in Ford Motor Company vehicles. If you have a different vehicle, please refer to our ELM322 and ELM323 products.
	Available in: 8-pin PDIP $16.50 CDN, 8-pin SOIC $18.50 CDN

ELM322 - OBD (VPW) to RS232 Interpreter		Data Sheet
	Similar to the ELM320, and also completely revised, the ELM322 is for connecting to an OBDII equipped vehicle which uses the 10.4KHz J1850 VPW format. This standard is typically used in General Motors Corporation and some DaimlerChrysler vehicles. The user need only issue the desired commands through an RS232 serial connection and the data formatting, error checking, bus arbitration, etc. on the vehicle side is all taken care of by the ELM322. This allows experimenters to inexpensively create their own 'scan tool'. If you presently use one of our v1.x ICs, you will be pleased to know that this version (v2.0) is pin-compatible with the old, so you can simply replace your IC if you want to upgrade.
	Available in: 8-pin PDIP $16.50 CDN, 8-pin SOIC $18.50 CDN

ELM323 - OBD (ISO) to RS232 Interpreter		Data Sheet
	The ELM323 completes our trio of OBDII ICs, allowing you to talk to your ISO 9141-2 or ISO 14230-4 standard OBDII equipped vehicle using an RS232 serial connection. It transparently converts between a 10.4KHz ISO data stream and standard ASCII characters, allowing trouble codes and operating parameters to be easily retrieved without the need for special software. No knowledge of data formatting, error checking, bus initiation etc. is needed either, as the ELM323 handles all of it for you. The present version of the ELM323 (v2.0) provides several programmable features that the previous versions did not offer. It now allows programmable header bytes, adjustable timeouts, the ability to report in the packed data mode, and offers a special monitoring mode as well. This is in addition to all of the capabilities that the v1.x ICs offered - the full seven byte command structure, two line (K and L) initiation, software selectable linefeeds and character echoing, and the visual feedback provided by the four LED outputs. If you currently use one of our v1.x ICs, you will be pleased to know that this version (v2.0) is pin-compatible with the old, so you can simply replace your present IC with one of these, and immediately begin enjoying these new features.
	Available in: 14-pin PDIP $17.50 CDN, 14-pin SOIC $19.50 CDN

ELM327 - OBD to RS232 Interpreter		Data Sheet
	We've improved our best OBD Interpreter, so now it's even better! The new v1.2 IC adds 3 new CAN protocols, and now offers more that 70 AT Commands, and almost 30 Programmable Parameters. In addition to the CAN (ISO 15765-4), SAE J1850 PWM, SAE J1850 VPW, ISO 9141-2 and ISO 14230-4 support, we now offer some support for J1939 CAN as well. Just as with our other OBD ICs, the ELM327 transparently converts OBDII data into standard ASCII characters, allowing trouble codes and operating parameters to be easily retrieved without the need for special software or hardware. No knowledge of data formatting, error checking, bus initiation etc. is needed either, as the ELM327 handles all of that for you. You don't even need to know what protocol your car 'speaks', as this IC automatically detects that for you. In addition to the improved protocol support, we think that you will also enjoy some of the other enhancements. For example, the new Adaptive Timing feature actually monitors the time it takes your vehicle to respond to queries, and continually adjusts the response timer to suit the current conditions. This feature is normally enabled, so you don't have to change your software or make any settings changes to enjoy the faster data transfer rates. One other very significant improvement is with the serial (RS232) interface. It has been completely updated, and now offers baud rates of up to 500 Kbps! You can change rates temporarily with a software command, or make it more permanent with a Programmable Parameter. There are many other features that you will only learn about if you download either the 'QuickSheet' (a 5 page summary), or the full (51 page) Data Sheet. We are currently shipping version 1.2 of this IC.	QuickSheet
	Available in: 28-pin PDIP $32.50 CDN, 28-pin SOIC $32.50 CDN

ELM621 - Serial Three Bit Port		Data Sheet
	Small control applications often only require a few port pins for outputs and feedback. This 8 pin circuit is perfect for these projects. It is controlled using a PC's serial port with standard 'AT' type commands, allows reconfiguration 'on the fly', and requires only a few external components for support.
	Available in: 8-pin PDIP $9.50 CDN, 8-pin SOIC $11.00 CDN

ELM624 - Control L (LANC) to RS232 Interpreter		Data Sheet
	Control L or LANC is a standard interface for controlling audio and video devices. It is similar in some ways to RS232, but not enough to allow direct connection to your computer. By using the ELM624, the peculiarities of the interface are translated for you, allowing direct control and monitoring of your favourite A/V machines.
	Available in: 8-pin PDIP $14.50 CDN, 8-pin SOIC $16.50 CDN
	Be sure to visit Eric Cairon's 'ritonworld' web site for some great construction plans and software for use with this chip. This link goes directly to the English version of the site. Nigel Ealand has used Eric's circuit board, and created a Visual Basic interface to interact with it. As well as offering a free interface program, he has posted the source code for download - be sure to visit his 'Ealing Sub-Aqua Club' site. For those that don't mind paying for a solution, one source is Applied Logic Engineering. They offer bare boards, complete boards, and software, all for a reasonable price.

ELM626 - RS232 Break Detector		Data Sheet
	This circuit is designed for remotely resetting devices via an RS232 interface. It connects directly to the RS232 signal lines, requiring only a single resistor, and no external timing components. Complementary outputs and digital selection of break period help simplify circuit integration.
	Available in: 8-pin PDIP $8.00 CDN, 8-pin SOIC $9.50 CDN

ELM627 - RS232 Break Detector		Data Sheet
	This circuit is similar to the ELM626 but also provides a single 100ms output pulse when powered up. Ideal for many small systems.
	Available in: 8-pin PDIP $8.00 CDN, 8-pin SOIC $9.50 CDN

ELM630 - LIN Monitor		Data Sheet
	This IC is a full-featured general purpose monitoring device for use on all LIN systems. It has recently been updated so that it is now compatible with the newer (rev 2.0) LIN specification, as well as older (rev 1.x) systems. The ELM630 is a very useful general purpose LIN integrated circuit that is able to automatically adjust to all of the standard LIN speeds (from 1200bps to 19200bps). It is able to simultaneously retrieve LIN data, check both classic and enhanced checksums, format the data as ASCII characters and transmit it to an RS232 serial device (a PC or PDA). It will prove useful in many monitoring, troubleshooting, or educational applications.
	Available in: 14-pin PDIP $16.00 CDN, 14-pin SOIC $18.00 CDN

ELM633 - 19200bps miniLIN Monitor		Data Sheet
	For those that are only interested in the 19200bps LIN protocol, this device is for you. It is just as capable as the ELM630, but its smaller package size will be appealing to those that want to minimize the circuit size. It includes the special power-on to monitor mode, has the same very high speed (57600 baud) RS232 rate, and works with rev 2.0 as well as older rev 1.x systems, too.
	Available in: 8-pin PDIP $14.50 CDN, 8-pin SOIC $16.50 CDN

ELM634 - 9600bps miniLIN Monitor		Data Sheet
	This IC is identical to the ELM633 in all aspects, except that it is for use on 9600 baud LIN systems. It connects to your computer or PDA at the same high RS232 speed (57600 baud), offers the same power-on to monitor feature, and is also compatible with the newest rev 2.0 systems.
	Available in: 8-pin PDIP $14.50 CDN, 8-pin SOIC $16.50 CDN