Appendix A System Interface Descriptions; Serial Interface Rs 232 C; Transmission Protocols - Epson PP 405 Benutzerhandbuch

System Interface Description
Appendix A
There are two system interfaces:
- one serial interface with RS-232C or RS-422 support
- one Parallel Centronics interface.
The interfaces can be operated in four different modes:
- serial interface active with RS-232C
- parallel interface active
- both interfaces active in shared mode with serial RS-232C
- both interfaces active in shared mode with serial RS-422
The following chapter gives an overview about interface characteristics, control
signals, protocols, and cabling.
Any change to the operation mode (Serial, Parallel or Shared) and to the size of
the interface buffer is possible only when the interface buffer is completely
empty of data.
Display messages: READY 1 ELQ, BUSY 1 ELQ, LOCAL.
Appendix A System Interface Description
1. Serial Interface RS-232C / RS-422
- Interface Characteristics
PG Protective Ground
TXD Transmit Data (from printer to host)
RXD Receive Data (from host to printer)
RTS Request to Send (printer is requesting data transfer from host)
CTS Clear to Send (host is ready to receive data from printer)
DSR Data Set Ready (host is requesting data transfer from printer,
SG Signal Ground
DTR Data Terminal Ready (printer is ready to receive - see also on the
following pages the data communication protocols for detail meaning
PG Protective Ground
RDA Receive Data (from host to printer)
SDA Send Data (from printer to host)
SDB Not Send Data (from printer to host)
RDB Not Receive Data (from host to printer)
- Transmission rate:
- Parity:
- Word length:
- Number of stop bits: In receive mode the printer accepts 1, or 2 stop bits. The

Transmission Protocols:

- XON/XOFF (default)
- DTR - Ready/Busy (only RS-232C)
- XON/XOFF + DTR (only RS-232C)
A-1 A-2
Signal Description RS-232C
can not be used for flow control, internaly set to "1")
Signal Description RS-422
600, 1200, 2400, 4800, 9600, or 19200 baud
even, odd, none, or ignore
7, or 8 bits
printer transmits always two bits.
Pin No. Direction
1 -
2 OUTPUT
3 INPUT
4 OUTPUT
5 INPUT
6 INPUT
7 -
20 OUTPUT
Pin No. Direction
1 -
3 INPUT
9 OUTPUT
10 OUTPUT
18 INPUT