Hi,
I read this on a page so I thought it should work with fhem too
http://haklabos.wordpress.com/projekti/digitemp/ (//haklabos.wordpress.com/projekti/digitemp/)
I only used a pl2303 usb to uart.
With digitemp it words fine
digitemp_DS9097 -i -s /dev/ttyUSB0
DigiTemp v3.5.0 Copyright 1996-2007 by Brian C. Lane
GNU General Public License v2.0 - http://www.digitemp.com (//www.digitemp.com)
Turning off all DS2409 Couplers
.
Searching the 1-Wire LAN
28A1677D0400009E : DS18B20 Temperature Sensor
ROM #0 : 28A1677D0400009E
Wrote .digitemprc
digitemp_DS9097 -a
DigiTemp v3.5.0 Copyright 1996-2007 by Brian C. Lane
GNU General Public License v2.0 - http://www.digitemp.com (//www.digitemp.com)
Mar 15 13:55:42 Sensor 0 C: 19.25 F: 66.65
But get an error with OWX first:
2013.03.15 13:57:24 3: Opening OWio1 device /dev/ttyUSB0
2013.03.15 13:57:24 3: Setting OWio1 baudrate to 9600
2013.03.15 13:57:24 3: OWio1 device opened
2013.03.15 13:57:24 1: OWX: Serial device /dev/ttyUSB0 defined
2013.03.15 13:57:25 1: OWX: 1-Wire bus OWio1: interface not found, answer was 0x17 0x41 0xab 0x20 0xfc
any idea what goes wrong?
No idea from the few information bits you gave.
If the kernel module for PL2303 is properly installed, OWX also works fine with PL2303 converters.
Please post:
- Type of FHEM system (Desktop Computer ? Fritzbox ?)
- Type of 1-Wire Interface attached to the PL2303 converter ?
rgds
pah
Well
I'm using it on a desktop fhem.
I attached the pl2303 directly the ds18b20.
the data pin from the ds18b20 is attached to both rx and tx.
the other is directly connected to the gnd and +5v to the pl2303
in digitemp is it an ds9097 and works.
No, this does not work.
OWX does not emulate the 1-Wire Bus communication - rather it needs a serial-to-1-Wire Adapter attached to the PL2303.
See here: http://www.fhemwiki.de/wiki/Interfaces_f%C3%BCr_1-Wire (//www.fhemwiki.de/wiki/Interfaces_f%C3%BCr_1-Wire)
rgds
pah
It should than work if I put an after the pl2303 uart the ds2480b and 2 condenators, as on the ft232rl?
http://www.fhemwiki.de/w/images/f/f6/USB_Interface.png (//www.fhemwiki.de/w/images/f/f6/USB_Interface.png)
i'm using like this one
regards Richard
Careful, is it the RS232 output or the UART output ? They are inverted, and if you have the "other" one Pin 6 of the DS2480 needs to be grounded instead of set to VDD. Extract from the DS2480 data sheet:
RXD/TXD Polarity Select. RXD/TXD polarity select; tied to GND for RS232
(12V or 5V) connection; tied to VDD for direct connection to UART chip.
rgds
pah
it's uart output. So that same as your scheme?
And another queation, is an passive interface possible on an uart, instead of rs232?
I have used the UART scheme, correct.
I would opt for a passive interface only as a last resort - main objection is, that there is no true ground and that there is no active signal formation.
OWX in principle supports also the passive interfaces, but I have not tested this for some time.
Well done cheap active interfaces may be found here:
http://www.shop.kristech.pl/c/31/1-wire-konwertery.html (//www.shop.kristech.pl/c/31/1-wire-konwertery.html)
rgds
pah