https://github.com/shemanaev/node-lpt
High-level bindings to parallel port for node.js
https://github.com/shemanaev/node-lpt
linux lpt lpt-port node node-lpt nodejs parallel-port
Last synced: 26 days ago
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High-level bindings to parallel port for node.js
- Host: GitHub
- URL: https://github.com/shemanaev/node-lpt
- Owner: shemanaev
- License: mit
- Created: 2013-11-28T20:58:34.000Z (about 12 years ago)
- Default Branch: master
- Last Pushed: 2017-12-20T06:53:17.000Z (about 8 years ago)
- Last Synced: 2025-08-14T21:18:54.032Z (6 months ago)
- Topics: linux, lpt, lpt-port, node, node-lpt, nodejs, parallel-port
- Language: C++
- Size: 25.4 KB
- Stars: 9
- Watchers: 1
- Forks: 3
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE.txt
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README
# node-lpt
High-level bindings to parallel port for node.js.
**Important**: this module works only under linux through the `parport` driver,
so you might need to compile kernel or modules (on gentoo mostly).
## Installation
$ npm install lpt
## Usage
```javascript
var lpt = require('lpt')
, port = new lpt.Port(0, 'byte', false) // open /dev/parport0 with forced `byte` mode set
// , port = new lpt.Port(0) // the same
console.log(port.data) // read data register
console.log(port.status.busy) // get /BUSY pin status
port.data = 123 // write data register
port.control.init = true // write to control register
```
## API
Constructor receives the following parameters:
* `port number`
* `parallel port mode` - optional. Can be:
* `spp`
* `nibble`
* `byte` - default
* `epp`
* `ecp`
* `negotiate port` - optional. If `true` will try IEEE 1284 compliant mode negotiation.
`Port` class provides next fields:
| Field | Type | Description | Read/Write | Pin num |
| --------------- | ---- | ------------- |:----------:| -------:|
| data | byte | Data register | R/W | 2..9 |
| control.init | bool | INIT | R/W | 16 |
| control.select | bool | /SELECT_IN * | R/W | 17 |
| control.autofd | bool | /AUTO_FEED * | R/W | 14 |
| control.strobe | bool | /STROBE * | R/W | 1 |
| status.ack | bool | ACK | R | 10 |
| status.busy | bool | /BUSY * | R | 11 |
| status.error | bool | ERROR | R | 15 |
| status.select | bool | SELECT | R | 13 |
| status.paperOut | bool | PAPEROUT | R | 12 |
| - | - | Ground | - | 18..25 |
*_Note that this pins are inverted by `node-lpt` itself_
**_You can read control pins only after you wrote something to it. Before that moment you can't rely on pin status_
## Useful links
* [Standard Parallel Port](http://users.utcluj.ro/~baruch/media/siee/labor/Standard-Parallel-Port.pdf)
* [Using in Linux](http://www.labbookpages.co.uk/electronics/parallelPort.html)
* [Parallel port interfacing made easy](http://www.epanorama.net/circuits/parallel_output.html)
* [ECP Description](http://retired.beyondlogic.org/ecp/ecp.htm)
## License
MIT