mfc-7820n

Brother MFC-J430W protocol wrapper (wifi scanner)

Reasons

_Brother MFC-J430W has already scanner driver and you can download here_ but that are prebuilt binary (x86/x64) and source code isn't public. My problem was that I wanted use scanner in my RPi4 but those driver not works on ARM architecture. In the end I solved this issue throught workaround using a vps... recently I resumed the project and I found a solution (partially thanks to this) and imho I think this is better than any workaround. I think that this should work on every scanner that use brscan4

Scanner protocol

Status codes

When we open a connection with the scanner on port 54921, it respond with his status code:

• -401: Scanner is busy
• +OK 200: Ready to use

Lease

Now we can send a request that specify resolution and color mode, then scanner send to client a offer based on request.

Request:

request := []byte(fmt.Sprintf("\x1bI\nR=%d,%d\nM=%s\n\x80", resolution, resolution, mode))
sendPacket(socket, request)

Response:

300,300,2,209,2480,294,3472

• response[0] response[1]: Resolution
• response[3] response[5]: Dimensions in mm
• response[4] response[6]: Dimensions in px
• response[2]: ?

Color mode are:

• GRAY64: gray scale image
• CGRAY: color image

Resolution are 100, 150, 300, 600, 1200, 2400. I called this part leasing because it recalled me DHCP lease

Automatic document feeder

If specified it's possible to disable ADF and scan only one page. Omit this if you want use ADF.

if !adf {
  request = []byte("\x1bD\nADF\n\x80")
  sendPacket(socket, request)
  readPacket(socket)
}

Start scan

Now we are ready to send start scan request:

requestFormat := "\x1bX\nR=%v,%v\nM=%s\nC=%s\nJ=MID\nB=50\nN=50\nA=0,0,%v,%v\n\x80"

• R = X_RES, Y_WIDTH
• M = CGRAY or GRAY64
• C = JPEG or RLENGTH or NONE
• J = MID
• B = 50 (Brightness?)
• N = 50 (Contrast?)
• A = 0,0,WIDTH, HEIGHT

Documentation work in progress...

Compile

git clone https://github.com/v0lp3/mfc-j430w.git
go build -o mfc-j430w mfc-j430w/src/*.go

Usage

./mfc-j430w --help

Output:

Usage of ./mfc-j430w:
  -a string
        IP address of the Brother scanner (default "192.168.0.157")
  -c string
        Color mode of the scan (CGRAY, GRAY64) (default "CGRAY")
  -m    Enable scan of all pages from feeder
  -n string
        Name of the output file (default "scan.jpg")
  -r int
        Resolution of the scan (default 300)

To do

• Implement multi page scan for ADF
• Add flag to output compressed image