Brother HL-730Plus Service Manual page 211

Note
To use bi-directional communication, an interface cable which has the pin
connections above must be used.
Pin
1
18
2
19
3
4
20
5
6
21
7
8
22
9
10
24
11
23
12
13
14
25
16
15
17
Shield
Fig. A-1 Parallel Interface Cable
Pin
1
19
2
20
3
21
4
22
5
23
6
24
7
25
8
26
9
27
10
28
11
29
12
17
13
15
14
30
31
33
32
34
36
35
18
16
Shield
APPENDIX
APPENDIX A–5