The Parallel Port: Device ID
In order to identify a peripheral, the host wants a device ID from the peripheral. This ID is sent just after the negotiation phase by the peripheral, if the host has requested it. The device ID is sent using the negotiated mode.
The device ID has variable size, so the first two bytes, transferred to the host high byte first, gives the size of the device ID in bytes, including the two size bytes.
A string of attribute value pairs follows. Each pair ends with a semicolon (;) (thus the device ID always ends with a semicolon).
The key and the value are separated by a colon (:).
The following keys are defined. Some keys have an abbreviated alternative name.
| Key | Abbrev. | Description | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CLASS | CLS |
The device's class. The following classes may occur as a value:
Other classes are vendor specific. |
||||||||||||||||||||||
| MANUFACTURER | MFG | The name of the manufacturer of the device | ||||||||||||||||||||||
| MODEL | MDL | The model name of the device (plain, without the manufacturer ID) | ||||||||||||||||||||||
| REV | revision (may be proprietary) | |||||||||||||||||||||||
| COMMAND SET | CMD | A command (,) separated list of languages the device speaks. For example, printers may speak: PCL, PJL, MCL, PML, POSTSCRIPT, PS,... | ||||||||||||||||||||||
| DESCRIPTION | DES | For the user: a concise description of the device | ||||||||||||||||||||||
| SERN | SN | serial number (may be proprietary) | ||||||||||||||||||||||
| CID | probably Windos stuff |
There are more keys that are typical use, but I do not know the precise definition: 1284.3M, 1284.4DL
Example
