Newb Needs Advice! - Electronic Circuits Projects Diagrams Free

Carnivore · 6th January 2007, 04:21 AM

As suggested in the title of this post, I am very new to electronics in general but I am very eager to learn

With that said, my question is this:

I am trying to interface a pc to another device via serial connection (sounds easy enough). WRONG!! I hit a small snag when i found out the device I'm trying to connect to my pc transmits serial in a very strange way (at least I think it’s strange). See below:

Questionable Device Serial Protocol

11 Bits and a nine (9) bit byte
Tx - 100mA @ 4V
Rx - 15mA @ 1V

As I stated before, I am a complete newbie with this stuff but it would appear some type of conversion needs to be made to make this interfacable with an RS232 port on my pc.

Any advice would be a great help. And I hate to ask this but please dumb down your answer so a regular Joe can understand

kchriste · 6th January 2007, 04:27 AM

Quote:

I am trying to interface a pc to another device via serial connection

What is the name of this device?

Carnivore · 6th January 2007, 04:33 AM

Quote:

Originally Posted by kchriste

What is the name of this device?

DOH!! sorry, I guess that information would have been helpfull huh?

I have called the device by many names. all of which are, for the sake of this forum, off limits. but the general name is a VENDING MACHINE . the connection is being made on the MDB plug.

hope this helps.

**Nigel Goodwin** · 6th January 2007, 07:33 AM

Assuming that spec is correct?, although it's too vague to actually create an interface, you wouldn't be able to use the hardware serial port. You could either create a suitable serial port in software (using either the parallel port or serial port handshake lines), or use a PIC to convert formats and use the hardware serial port on the PC.

The other problem is converting the actual signal itself?.

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6th January 2007, 04:21 AM	#1
Carnivore	Newb Needs Advice! As suggested in the title of this post, I am very new to electronics in general but I am very eager to learn With that said, my question is this: I am trying to interface a pc to another device via serial connection (sounds easy enough). WRONG!! I hit a small snag when i found out the device I'm trying to connect to my pc transmits serial in a very strange way (at least I think it’s strange). See below: Questionable Device Serial Protocol 11 Bits and a nine (9) bit byte Tx - 100mA @ 4V Rx - 15mA @ 1V As I stated before, I am a complete newbie with this stuff but it would appear some type of conversion needs to be made to make this interfacable with an RS232 port on my pc. Any advice would be a great help. And I hate to ask this but please dumb down your answer so a regular Joe can understand

6th January 2007, 07:33 AM	#4
Nigel Goodwin	Assuming that spec is correct?, although it's too vague to actually create an interface, you wouldn't be able to use the hardware serial port. You could either create a suitable serial port in software (using either the parallel port or serial port handshake lines), or use a PIC to convert formats and use the hardware serial port on the PC. The other problem is converting the actual signal itself?. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk