8.9.3 RS-232C
The RS-232C on your printer is DB9 female. It transmits data bit by bit in
asynchronous start-stop mode. The figure below shows its pinout.
9 8
7
6
Pin Signal Description
1 +5V Provide 5V Power
2 RxD Receive
3 TxD Transmit
4 NC No Connection
5 GND Ground
6 Hi Pull High
7 RTS NC Request to Send
8 CTS Clear to Send
9 Hi Pull High
Speed: 2400, 4800, 9600, 19200, 38400, 57600, 115200 Bauds
Parity: Odd, Even or None
Data Bits: 7 or 8 Bits
Stop Bits: 1 or 2 Bits
Flow Control: XON/XOFF or RTS
Default Parameters: 9600 Bauds, No Parity, 8 Data Bits, 1 Stop Bit, XON/XOFF
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