Epson Stylus Pro XL+ [553/573] Internal serial interface

Epson Stylus 1500 [553/573] Internal serial interface
Internal Serial Interface A-35
Internal Serial Interface
Six-pin DIN connector type
Connector pin assignment
Pin Number Signal Signal Dir. Description
1 TXD Out Transmits data for Xon/Xoff
2 REV Out Whether or not the printer is ready to receive data
3 RXD In Receive data
4 NC Not Used
5 SG Signal Ground
6 FG Frame Ground
Synchronization Asynchronous
Data format 1 start bit
Data word length: 8 bits
Odd, even, or no parity
1 stop bit
Baud rate 300-19,200 bps, depending on printer
Signal level Mark (1) –3V to –27V
Space (0) +3V to +27V
Handshaking Handshaking by DTR signal or X-on/X-off. When the number of free
bytes in the input buffer drops below 256, the DTR signal changes to
“mark”, signifying the printer is not ready to receive data. When the
number of free bytes rises above 528, the DTR signal changes to “space,”
specifying that the printer is now ready to receive data.

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