Epson 1500 - Manual (Page 172)

Interface timing
The figure below shows the timing for the parallel interface.
BUSY
ACKNLG
DATA
STROBE
Signal level: TTL compatible
Serial interface
Data format
Word length: 7 or 8 bits
Parity: None, odd, or even
Stop bits: 1 or 2
Printer ready
protocol: Enabled (DTR and XON/XOFF protocol set
to ON).
The data format can be set using functions and menu items in
SelecType.
Baud rate:
300,600,1200,2400,4800,9600,19200,
38400 bits per second.
Signal level: RS-232C: Conforms to EIA
Connector: D-sub 25-pin connector
A-12
Technical Specifications