Re: [time-nuts] OT : different Rx and Tx baud rate on same port
An alternative to writing your own software is using 'socat' which can interface between a tcp port and serial port (perhaps using a raspberry pi or the like as the interface). It apparently has settings for separate ispeed and ospeed. Its competitor, ser2net, doesn't seem to have that ability. This way you can create a virtual serial port with the baud rate details hidden. As for whether all this would work on current hardware -- I haven't tested because I haven't had reason to try, nor the hardware to test it on. I can tell you, as I noted above, that changing baud rates on the fly works, even with telnet connections using RFC2217 commands, since I use that with 1-wire work. The only problems were some of the stranger settings, like 6-bit words. Paul Alfille On Sat, Dec 7, 2013 at 3:18 PM, Hal Murray hmur...@megapathdsl.net wrote: b...@lysator.liu.se said: Looking at the stty unix command. It seems clear that split baud rates has been supported at one time. On Linux, man termios gives lots of API details. On NetBSD and FreeBSD, that gets an overview. man tcsetattr gets the API details. If you use stty to change things, the new info is sticky. So if you have a program that is all set to go except that the baud rates aren't right and that program doesn't smash the baud rates, you can set them with stty and your program should work. I haven't tried it with split baud rates, but the normal (non-split) case works. If your gizmo uses simple ASCII, you can test things with cat /dev/wherever and things like this on another terminal echo blah blah... /dev/wherever -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] OT : different Rx and Tx baud rate on same port
You could also consider making a simple gadget with your microcontroller of choice, that presents an interface to the PC of a fixed baud rate (perhaps 115200) and handles the weirdo split rates for the GPS gadget on one or two of its other ports. Henry On Sat, Dec 7, 2013 at 12:18 PM, Hal Murray hmur...@megapathdsl.net wrote: b...@lysator.liu.se said: Looking at the stty unix command. It seems clear that split baud rates has been supported at one time. On Linux, man termios gives lots of API details. On NetBSD and FreeBSD, that gets an overview. man tcsetattr gets the API details. If you use stty to change things, the new info is sticky. So if you have a program that is all set to go except that the baud rates aren't right and that program doesn't smash the baud rates, you can set them with stty and your program should work. I haven't tried it with split baud rates, but the normal (non-split) case works. If your gizmo uses simple ASCII, you can test things with cat /dev/wherever and things like this on another terminal echo blah blah... /dev/wherever -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] OT : different Rx and Tx baud rate on same port
The posix C library supports this. http://linux.die.net/man/3/tcsetattr with the cfsetispeed and cfsetospeed functions. We do something similar to synthesize 1-wire protocol with the serial port by switching between baud rates to change from data to reset pulses. It works pretty well depending on how well your usb-serial convertor supports corner cases. Of course this requires writing your own software. Paul Alfille On Fri, Dec 6, 2013 at 11:48 PM, James Tucker james.d.tuc...@gmail.comwrote: Björn; What platforms (HW and OS) are we considering? If I were writing the software, I'd seriously consider using two ports. JimT Sent from *my* galaxy (Nexus). On Dec 6, 2013 9:33 PM, Björn b...@lysator.liu.se wrote: Hi, I am looking for current serial adapters that support split baud rates. That is different input and output baud rate. Grateful for suggestions! kind regards, Björn ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] OT : different Rx and Tx baud rate on same port
Tom, Bob James, (will answer in one response, to save some bandwidth) I have a GPS receiver that is hard configured at 19200baud one way, and 76800baud the other. The most convinient would be a USB serial adapter, but ExpressCard or PC-CARD is also ok. PCI/PCIE is better than nothing. HW is a laptop. Preferably a modern one. But one with PCMCIA is also ok. I have a (binary only) windows program that I need to run. Windows version either XP or preferably win7. But I am interested in running the adapter in linux also. In Linux I can arrange with combining two serial ports, since I have the source. In MSWindows I do not have that luxuary. Have seen reference to the bb-elec stuff. The closest I found now is http://www.bb-elec.com/Products/Datasheets/232brc_0812DSds.pdf which convert baud rates, but I think not in the way I wish. I have looked but not fully digested if the advanced async/sync serial adapters can do split baud rates. http://www.commtech-fastcom.com/data_sheets/sab82532.pdf It seems there was a time in the distant past where this was more common. Setting the input baud rate to zero was a mechanism to allow for split baud rates. Clarifications in this volume of IEEE Std 1003.1-2001 have made it possible to determine whether split rates are supported and to support them without having to treat zero as a special case. http://manpages.ubuntu.com/manpages/hardy/man3/cfgetispeed.3posix.html Here is an (obsolete, but with documentation from 2009 its not ancient) serial controller from Exar The Independent TX/RX Baud Rate Generator feature allows the transmitter and receiver to operate at different baud rates. http://www.exar.com/connectivity/uart-and-bridging-solutions/8-bit-vlio-uarts/xr16m680 Looking at the stty unix command. It seems clear that split baud rates has been supported at one time. http://www.openbsd.org/cgi-bin/man.cgi?query=sttysektion=1 ispeed number Set terminal input baud rate to the number given, if possible. If the input baud rate is set to zero, the input baud rate is set to the value of the output baud rate. ospeed number Set terminal output baud rate to the number given, if possible. If the output baud rate is set to zero, modem control is no longer asserted. speed number This sets both ispeed and ospeed to number. With this much hinting, I was hoping there was still some hardware out there supporting split baud rates. kind regards, Björn Björn, If you can't find a black box that does this, just use two serial ports: Rx from one and the Tx from the other. On the software side it means opening two devices, but that shouldn't be hard to handle. Note bb-elec.com used to make a cute 4-port serial concentrator that would allow you to configure different baud rates in/out, but I see that's no longer a current product. Of course you could do all this with a micro or SBC, but I assume you're looking for a turn-key device rather than a homebrew project. /tvb - Original Message - From: Björn b...@lysator.liu.se To: time-nuts@febo.com Sent: Friday, December 06, 2013 4:14 PM Subject: [time-nuts] OT : different Rx and Tx baud rate on same port Hi, I am looking for current serial adapters that support split baud rates. That is different input and output baud rate. Grateful for suggestions! kind regards, Björn ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] OT : different Rx and Tx baud rate on same port
Here is a snippet of code from a program in C I have running on Linux. Notice that I had to set both the input and output baud rates. After looking around on the web, it seems to be a matter of whether the hardware will support split baud rate. So, essentially, code it and try it. cfsetospeed(tioPLL,B4800); // 4800 baud cfsetispeed(tioPLL,B4800); // 4800 baud tcsetattr(ttyPLL,TCSANOW,tioPLL); Bob ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] OT : different Rx and Tx baud rate on same port
Paul, The posix C library supports this. http://linux.die.net/man/3/tcsetattr with the cfsetispeed and cfsetospeed functions. Yes, but do the serial device drivers (still) support it? Is there hardware supporting it? -- Björn ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] OT : different Rx and Tx baud rate on same port
b...@lysator.liu.se said: Looking at the stty unix command. It seems clear that split baud rates has been supported at one time. On Linux, man termios gives lots of API details. On NetBSD and FreeBSD, that gets an overview. man tcsetattr gets the API details. If you use stty to change things, the new info is sticky. So if you have a program that is all set to go except that the baud rates aren't right and that program doesn't smash the baud rates, you can set them with stty and your program should work. I haven't tried it with split baud rates, but the normal (non-split) case works. If your gizmo uses simple ASCII, you can test things with cat /dev/wherever and things like this on another terminal echo blah blah... /dev/wherever -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] OT : different Rx and Tx baud rate on same port
Hi, I am looking for current serial adapters that support split baud rates. That is different input and output baud rate. Grateful for suggestions! kind regards, Björn ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] OT : different Rx and Tx baud rate on same port
Hi What kind of interface? Bob On Dec 6, 2013, at 7:14 PM, Björn b...@lysator.liu.se wrote: Hi, I am looking for current serial adapters that support split baud rates. That is different input and output baud rate. Grateful for suggestions! kind regards, Björn ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] OT : different Rx and Tx baud rate on same port
Björn; What platforms (HW and OS) are we considering? If I were writing the software, I'd seriously consider using two ports. JimT Sent from *my* galaxy (Nexus). On Dec 6, 2013 9:33 PM, Björn b...@lysator.liu.se wrote: Hi, I am looking for current serial adapters that support split baud rates. That is different input and output baud rate. Grateful for suggestions! kind regards, Björn ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] OT : different Rx and Tx baud rate on same port
Björn, If you can't find a black box that does this, just use two serial ports: Rx from one and the Tx from the other. On the software side it means opening two devices, but that shouldn't be hard to handle. Note bb-elec.com used to make a cute 4-port serial concentrator that would allow you to configure different baud rates in/out, but I see that's no longer a current product. Of course you could do all this with a micro or SBC, but I assume you're looking for a turn-key device rather than a homebrew project. /tvb - Original Message - From: Björn b...@lysator.liu.se To: time-nuts@febo.com Sent: Friday, December 06, 2013 4:14 PM Subject: [time-nuts] OT : different Rx and Tx baud rate on same port Hi, I am looking for current serial adapters that support split baud rates. That is different input and output baud rate. Grateful for suggestions! kind regards, Björn ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
