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System Interface Description
Appendix A
There are two system interfaces:
- one RS-232C serial interface
- one Parallel Centronics interface.
The interfaces can be operated in three different modes:
- serial interface active
- parallel interface active
- both interfaces active in shared mode
The following chapter gives an overview about interface characteristics, control
signals, protocols, and cabling.
Any change of the operation mode (Serial, Parallel or Shared) and of the size of
the interface buffer is possible only when the interface buffer is completely
empty of data.
Display messages: READY 4 ELQ , BUSY 4 ELQ, or LOCAL.
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Appendix A System Interface Description
1 Serial Interface RS-232C
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 ready to send data)
CTS
Clear to Send (host is ready to receive data)
DSR
Data Set Ready
SG
Signal Ground
DTR
Data Terminal Ready (printer is ready to receive - see also on the
following pages the data communication protocols for detail mean-
ing)
*) with internal pull-up
- Transmission rate:
- Parity:
- Word length:
- Number of stop bits: In receive mode the printer accepts 1, or 2 stop bits. The
Transmission Protocols:
- DTR - Ready/Busy
- XON/XOFF
- XON/XOFF + DTR
A-1
A-2
Signal Description
600, 1200, 2400, 4800, 9600, or 19200 baud
even, odd, none, or ignore
7, or 8 bits
printer transmits always two stop bits.
Pin No. Direction
1
-
2
OUTPUT
3
INPUT
*)
4
OUTPUT
*)
5
INPUT
6
INPUT
7
-
20
OUTPUT
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