Epson ES-1200C - Manual (Page 65)

Signal pin assignments
In this table, the direction of the signals is given relative to the
scanner.
Signal
GND
I----
NC
No. I
I
1-12
14-25
35-37
39-40
42
13
26
27
Ground
Not connected
Data bus 0
Data bus 1
28
DB3 29 Data bus 3
DB4 30 Data bus 4
DB5 31 Data bus 5
MSG 0 46 Message
SEL 47 Select
C/D 0 48 Control/Data
49 Request
I
50 Input/Output
I
4-10 Technical Specifications