Note that the spooler redirects the LPT x symbolic link (where x is the LPT number 1, 2, or 3) to the spooler's named pipe, which means that if the spooler is running, then parport never sees the IOCTLs sent to LPTx. To read the 1284 ID string from the device, send IOCTL_PAR_QUERY_DEVICE_ID. Spaces in the string are replaced with underscores. The CRC code, which is the last four digits of the hardware ID, is generated from the manufacturer and model strings. The hardware ID is made up of the enumerator prefix, followed by the Manufacturer Name, the Model name, and a cyclic redundancy check (CRC) code.
The printer class installer calls SetupDi-prefixed device installation functions, which obtain information from printer INF files.įor a parallel-connected printer, the parallel enumerator creates a devnode with a unique hardware ID generated from the 1284 string it receives from the printer.Īn example 1284 string is: "MANUFACTURER:Hewlett-Packard COMMAND SET:PJL,MLC,PCL,POSTSCRIPT MODEL:HP Color LaserJet 550 CLASS:PRINTER COMMENT:HP LaserJet "įrom this 1284 string the parallel enumerator produces the following hardware ID: LPTENUM\Hewlett-PackardHP_Co3115 For each device found, the configuration manager calls the printer class installer. When a Windows 2000 or later system starts, the configuration manager calls the LPT enumerator to enumerate the IEEE 1284-compatible devices connected to LPT ports.
The LPT enumerator is capable of obtaining identification information from LPT port hardware that conforms to the IEEE 1284 Extended Capabilities Port Protocol and ISA Interface Standard. Other Related Generic ieee 1284.The LPT enumerator is an example of a bus driver.
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