This is calculated by dividing the divisor by 4 until it is less than 512 (the number of times you canĭo this is the exponent). This divisor is encoded in a special way.
#PROLIFIC USB TO SERIAL DRIVER WINDOWS 7 DRIVER#
When not using the 'standard' rates, the Linus driver sets byte 3 to 0x80 and bytes 1 and 0 hold the divisor of the clock (12MHz * 32). There are four bytes used to send the baud rate. So on more investigation and many hours of trial and error I have determined the correct formua for the non-standard rates with this Prolific 2303. 3:57 ` Grant Edwards 1 sibling, 1 reply 41+ messages in threadįrom: Michael G.
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15:37 non-standard baud rates with Prolific 2303 USB-serial Michael G. * Re: non-standard baud rates with Prolific 2303 USB-serial I tried adding 110 to the supported rates but this did not produce the correct baud rate so I presume the Windows driver is using a formula different than the one in the Linux driver for 'non standard' baud rates.ĭoes anyone have any suggestions to get this working at 110bd or what other experiments to try? The data sheets don't describe the formula used for deriving the four bytes used to set the speed. Other rates like 200 also produce odd speeds although not in a logical manner. Stty to 110 bd results in ~95,000 bd (that's not a typo but 95 thousand). The Linux driver does not seem to produce sensible baud rated for other than the 'supported' rates. The Manufacturer of this device is 'Sabrabt' (CB-DB9P) and I believe it's a genuine chip device (and not a clone). Static const struct usb_device_id id_table = , The USB PID/VID is 0673 / 2303 which corresponds to The USB device will work at 110 Bd in Windows 10 but not under the Linux driver. I am trying to use a USB serial interface with a Prolific chip to connect to an old ASR 33 Teletype at 110 Bd. 3:57 ` Grant Edwards 0 siblings, 2 replies 41+ messages in threadįrom: Michael G.
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Non-standard baud rates with Prolific 2303 USB-serial archive mirror help / color / mirror / Atom feed * non-standard baud rates with Prolific 2303 USB-serial 15:37 Michael G.