Epson C I - 4 0 4 User Manual page 126

1.2.3 Serial Interface with RS-422 (only CI - 4040)
This interface typ requires the signal lines.
S Pin
1 Protective Ground (PG)
S
3 Receive Data (RDA)
S
9 Send Data (SDA)
S
10 Not Send Data (SDB)
S
18 Not Receive Data (RDB)
Standard Connection
RS-422
PG
RDA
SDA
SDB
RDB
Protective ground (PG) connected either to host or printer
Note:
1
3
9
10
18
Appendix A System Interface Description
RS-422
PG
RDA
SDA
SDB
RDB
A-7