Appendix C — Interfaces
140 EasyCoder PM4i Printer User’s Guide (Fingerprint Version)
RS-232 Interface
Protocol
To change the RS-232 interface settings, see “Setting Up the
Printer” on page 51.
Signals on printer’s serial port “uart:
”
*The external +5V is limited to 500 mA and is automatically
switched off at overload.
Protocol
Default setup:
Baud rate: 9600
Char. length 8 bits
Parity: None
Stop bits: 1
RTS/CTS Disabled
ENQ/ACK: Disabled
XON/XOFF: Disabled (both ways)
New Line: CR/LF
DB-9 Signal Meaning
1 External +5V DC*
2 TXD Tr a n s m i t d a t a
3 RXD Receive data
4 DSR Data set ready
5GNDGround
6 DTR Data terminal ready
7CTSClear to send
8 RTS Request to send
9–Not used
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