Difference between revisions of "Serial port"
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= | = USB to Serial Converters = | ||
To operate devices | To operate devices that have RS-232 or TTL serial interfaces on computers that have only USB interfaces, converters are available. Many different chipsets exist that have slightly different properties, often supporting only a subset of what common UARTs like the 8250/16550A can do. Please note that a driver for the respective operating system is required (sometimes included in the OS already, e.g. mostly for Linux). | ||
Many original USB cables from manufacturers use these converters, too, either with the chip manufacturer's or a custom USB ID. | |||
Some RS232 devices won't work on RS232-USB converters because they | Some RS232 devices won't work on RS232-USB converters because they need a higher RS232 signal voltage than supplied by most of these converters, e.g. to drive optocouplers in the interface. | ||
Common chipsets are: | Common chipsets are: | ||
| Line 16: | Line 17: | ||
! Manufacturer | ! Manufacturer | ||
! Type | ! Type | ||
! | ! USB | ||
! Data Bits | ! Data Bits | ||
! Non-standard baud rates | ! Non-standard baud rates | ||
| Line 24: | Line 25: | ||
|- | |- | ||
| | | FTDI | ||
| | | | ||
| | |||
| | |||
| | | | ||
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
| | | rowspan="8" | MOSChip (Asix) | ||
| ( | | MCS7703 | ||
| 1.1 | |||
| | |||
| | | | ||
| | | | ||
| [http://www.asix.com.tw/products.php?op=ProductList&PLine=74&PSeries=109 1] | |||
| 1 serial port; out of production | |||
|- | |||
| MCS7710 | |||
| 1.1 | |||
| | | | ||
| | | | ||
| | | | ||
| | | [http://www.asix.com.tw/products.php?op=ProductList&PLine=74&PSeries=109 1] | ||
| 1 serial port; out of production | |||
|- | |- | ||
| | | MCS7815 | ||
| 1.1 | |||
| | |||
| | |||
| | | | ||
| [http://www.asix.com.tw/products.php?op=ProductList&PLine=74&PSeries=109 1] | |||
| 1 serial, 1 parallel port | |||
|- | |||
| MCS7717 | |||
| 1.1 | |||
| | | | ||
| | | | ||
| | | | ||
| [http://www.asix.com.tw/products.php?op=ProductList&PLine=74&PSeries=109 1] | |||
| 1 serial, 1 parallel port and 3-port USB hub; out of production | |||
|- | |||
| MCS7720 | |||
| 1.1 | |||
| | | | ||
| | | | ||
| | | | ||
| [http://www.asix.com.tw/products.php?op=ProductList&PLine=74&PSeries=109 1] | |||
| 2 serial ports | |||
|- | |- | ||
| MCS7810 | | MCS7810 | ||
| | | 2.0 | ||
| | | | ||
| | | | ||
| | | | ||
| [http://www.asix.com.tw/products.php?op=ProductList&PLine=74&PSeries=109 1] | | [http://www.asix.com.tw/products.php?op=ProductList&PLine=74&PSeries=109 1] | ||
| 1 | | 1 serial port | ||
|- | |- | ||
| MCS7820 | | MCS7820 | ||
| | | 2.0 | ||
| | | | ||
| | | | ||
| | | | ||
| [http://www.asix.com.tw/products.php?op=ProductList&PLine=74&PSeries=109 1] | | [http://www.asix.com.tw/products.php?op=ProductList&PLine=74&PSeries=109 1] | ||
| 2 | | 2 serial ports | ||
|- | |- | ||
| MCS7840 | | MCS7840 | ||
| | | 2.0 | ||
| 5-8 | | 5-8 | ||
| yes; broken on Mac | | yes; broken on Mac | ||
| | | | ||
| [http://www.asix.com.tw/products.php?op=ProductList&PLine=74&PSeries=109 1] | | [http://www.asix.com.tw/products.php?op=ProductList&PLine=74&PSeries=109 1] | ||
| 4 | | 4 serial ports | ||
|- | |||
| Prolific | |||
| PL-2302x | |||
| | |||
| 7,8 | |||
| | |||
| | |||
| [http://www.prolific.com.tw/US/ShowProduct.aspx?pcid=41&showlevel=0017-0037-0041 1] | |||
| | |||
|- | |||
| Prolific Fake | |||
| (PL-2302) | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| It seems that fakes of prolific chips with limited reliability exist.[http://www.prolific.com.tw/US/ShowProduct.aspx?p_id=155&pcid=41 1] | |||
|- | |||
| SiLabs | |||
| CP2102 | |||
| | |||
| 5,6,7,8 | |||
| | |||
| | |||
| | |||
| | |||
|} | |} | ||
Revision as of 22:36, 21 November 2013
Serial Ports are a common way to communicate with devices. The most common serial ports, as used by devices like Metex/Voltcraft multimeters, are RS-232 interfaces.
USB to Serial Converters
To operate devices that have RS-232 or TTL serial interfaces on computers that have only USB interfaces, converters are available. Many different chipsets exist that have slightly different properties, often supporting only a subset of what common UARTs like the 8250/16550A can do. Please note that a driver for the respective operating system is required (sometimes included in the OS already, e.g. mostly for Linux). Many original USB cables from manufacturers use these converters, too, either with the chip manufacturer's or a custom USB ID.
Some RS232 devices won't work on RS232-USB converters because they need a higher RS232 signal voltage than supplied by most of these converters, e.g. to drive optocouplers in the interface.
Common chipsets are:
| Manufacturer | Type | USB | Data Bits | Non-standard baud rates | Max. baud rate | Homepage | Remarks |
|---|---|---|---|---|---|---|---|
| FTDI |
| ||||||
| MOSChip (Asix) | MCS7703 | 1.1 | 1 | 1 serial port; out of production | |||
| MCS7710 | 1.1 | 1 | 1 serial port; out of production | ||||
| MCS7815 | 1.1 | 1 | 1 serial, 1 parallel port | ||||
| MCS7717 | 1.1 | 1 | 1 serial, 1 parallel port and 3-port USB hub; out of production | ||||
| MCS7720 | 1.1 | 1 | 2 serial ports | ||||
| MCS7810 | 2.0 | 1 | 1 serial port | ||||
| MCS7820 | 2.0 | 1 | 2 serial ports | ||||
| MCS7840 | 2.0 | 5-8 | yes; broken on Mac | 1 | 4 serial ports | ||
| Prolific | PL-2302x | 7,8 | 1 | ||||
| Prolific Fake | (PL-2302) | It seems that fakes of prolific chips with limited reliability exist.1 | |||||
| SiLabs | CP2102 | 5,6,7,8 |