Device Settings When Software Requires Dtr/Dsr Handshaking - Epson IR-320 Technical Reference Manual

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The illustration below shows the final electrical connection.

Device Settings When Software Requires DTR/DSR Handshaking

To set DTR/DSR handshaking, check that the IR-320 and the TM Printer use the following
settings:
Handshaking for the TM-xxR Printer should be set to DTR/DSR.
Set DIP switch 1-3 of the TM-xxR Printer to OFF. (This is the default setting.)
Set Jumper JP32 on the POS board to SHORTED. (This is the default setting.)
The recommended setting for the Windows FIFO buffer is disabled. This prevents timing
delays caused by the data being held in the buffer. If customers want the setting to be
enabled, the manufacturer recommends that the transmission buffer size be less than 16
bytes.
The Customer Display is controlled by RTS/CTS handshaking.
Notes:
You cannot use RTS/CTS handshaking to control the TM Printer.
You cannot use XON/XOFF handshaking to control the Customer Display, because the Customer
Display can use DTR/DSR handshaking only.
The Windows serial driver (DLL), Visual Basic command, or MFC control the DTR/DSR flow.
Appendix C-4 Serial Handshaking
With Jumper JP32 POS Board SHORTED (Default)
Rev. C