USB Phone Cable for JP1.x

Tommy Tyler · Post by **Tommy Tyler** » Thu Dec 06, 2007 9:49 am

Well I'm confused.

binky123 wrote:The issue here was that the DTR_N signal coming from the PL2303 chip was inverted.

DTR is standard. The PL-2303 chip is just a USB-to-RS232 converter chip, and has no say over whether the DTR signal is normal or inverted. That's controlled by the virtual port feeding the PL-2303.

binky123 wrote:I suggested he hook up his RTS_N line to the MCU /RESET line.

I hope that means you suggested he build his interface like an early JP1.2 design, but that you haven't put anything special in the software just for him, because it isn't needed. See this for further clarification.

Incidentally, binky's comment about COM ports greater than 9 deserves greater appreciation. I found that many of the Prolific USB-to-Serial adapters like to enumerate to ports greater than 9, and prior to this version of jp12serial.dll, IR would just say it was unable to open the port. Who knows how many members have been frustrated by that.

Tommy

cerulean · Post by **cerulean** » Fri Dec 07, 2007 2:14 pm

Tommy Tyler wrote:The PL-2303 chip is just a USB-to-RS232 converter chip...

The PL-2303 chip is a USB to TTL serial converter. Those USB to RS-232 cables need an additional chip to convert from TTL to RS-232 levels. The cable that I am using doesn't have that addtional chip (it started it's life as a data cable for a Motorola cell phone), so my levels may be different from the norm.

So my wiring looks like this now:

Code: Select all

         PL2303          IDC-6 
         1  TXD   ----   4 Data-In 
         3  RTS_N ----   2 /RESET 
         5  RXD   ----   6 Data-Out 
         Shield   ----   3 GND

Here is my remote:

With binky123's latest DLL, I can now read from and write to the remote (Thank you.

).

I've been sidetracked with other projects, but I'm hoping to start setting up this remote this weekend.

Tommy Tyler · Post by **Tommy Tyler** » Fri Dec 07, 2007 4:05 pm

Most of the low cost (read eBay) USB-to Serial converters do not have the second chip for providing true RS232 voltage levels. I have yet to find a PC that doesn't communicate flawlessly at TTL voltage levels for the short distance, low baud rate, relatively noise-free environment we're talking about, so I don't expect you'll have any problems.

Tommy

bgdani1 · Post by **bgdani1** » Wed Nov 23, 2011 11:33 am

I've searched the forum but could not find definitive answer.

Does IR support plain USB to (LVTTL) Serial cable such as this

http://www.dealextreme.com/p/data-cable ... -ca-42-446

to connect to JP 1.2/JP1.3 remote using

Code: Select all


         PL2303          IDC-6 
         1  TXD   ----   4 Data-In 
         3  RTS_N ----   2 /RESET 
         5  RXD   ----   6 Data-Out 
         Shield   ----   3 GND

Or I still need to build
1) USB Interface and
2) buy USB/Serial Interface
http://www.meritline.com/usb-to-rs232-a ... 36588.aspx

I'm planning to use it with Windows XP 32-bit.

Been a long time JP1 user and now tring to configure RS 15-100.

binky123 · Post by **binky123** » Mon Nov 28, 2011 10:47 pm

If you have a driver that presents a COM/serial port interface to Windows, then it should work with IR. Your USB to (LVTTL) Serial cable looks like it'll work. You should try to confirm the pin names to be sure.

cerulean · Post by **cerulean** » Tue Nov 29, 2011 7:38 pm

bgdani1 wrote:Does IR support plain USB to (LVTTL) Serial cable such as this

http://www.dealextreme.com/p/data-cable ... -ca-42-446

Hi,

I got your PM.

The cable should work. I just tried my cable with a 15-100 and IR V8.03. I could download from the remote.

Bob

bgdani1 · Post by **bgdani1** » Thu Dec 01, 2011 10:20 am

Thank you for confirmations. I'm waiting for adapters from both dealextreme and meritline and will report back.

mdavej · Post by **mdavej** » Mon Jan 16, 2012 2:09 pm

bgdani1 wrote:Does IR support plain USB to (LVTTL) Serial cable such as this

http://www.dealextreme.com/p/data-cable ... -ca-42-446

to connect to JP 1.2/JP1.3 remote using
Code: Select all
         PL2303          IDC-6 
         TXD   ----   4 Data-In 
         RTS    ----   2 /RESET 
         RXD   ----   6 Data-Out 
         GND   ----   3 GND 
 

I got the above dealextreme cable for $4.44 shipped and can confirm it works fine as a JP1.3/JP2 cable with the above pinout. Note the locations of TX, RX, GND and RTS below. On a JP2 remote with a 5-pin female connector like the URC-8820BC1, what would have been pin 6 is now pin 5. All other pins are the same.

HERE are the drivers. If you find one known to work in Win7, please post it. THESE don't work in XP, but may work in Win7. I haven't tried them.

eferz · Post by **eferz** » Tue Jan 17, 2012 5:32 pm

mdavej wrote:I got the above dealextreme cable for $4.44 shipped and can confirm it works fine as a JP1.3/JP2 cable with the above pinout. Note the locations of TX, RX, GND and RTS below. On a JP2 remote with a 5-pin female connector like the URC-8820BC1, what would have been pin 6 is now pin 5. All other pins are the same.

So, I wonder if this post was your subtle suggestion to create a dedicated $10 "JP2.1" cable by frankensteining:

+

= Dedicated JP2.1 adapter!
Cause you know what they say about fishing a horse out of water, you can take the water out of the horse but that doesn't mean he'll drink it. (or something like that.)

mdavej · Post by **mdavej** » Tue Jan 17, 2012 9:53 pm

That's pretty much what I did. Unfortunately I only had the first part of the equation and ended up mutilating a DB-9 male connector for the other end. It's ugly, but it works.

Dilligaf · Post by **Dilligaf** » Sat Feb 11, 2012 3:38 pm

Here are Win 7 drivers that work with the cheap chinese cables http://www.hifi-remote.com/forums/dload ... e_id=10675