Epson SQ-B50/2550 Technical Manual page 274

REV.-A
Table A-G. E02A24GA Terminal Functions
Pin No.
Name
I/O
Function
27,22, NC 0 Not used
25, 18
14 lOUT
-
Not used
41
CS I Chip select signal
17 RST I Reset signal
45 SOUT 0 Output Serial data
A-16