Epson MP-2100 TH manual Communication Interfaces, Serial Interface

MP-2100 TH · Revision 1.1

Chapter 3

Communication Interfaces

Communication between a host and the printer can be performed in three communication interface: USB, Parallel or Serial RS-232, according to the printer model.

Communication cables are not supplied with the printer

Serial Interface

The RS232 serial interface uses a female DB-9 connector. The serial port can operate using the RTS/CTS mode, with 8 data bits, without parity, one start bit and one stop bit. In the RS232 standard, the logic low level corresponds to a +12V voltage level and a logic high level corresponds to a –12V voltage level.

RTS/CTS mode

In this mode, the printer’s RTS line controls the flow of data sent from the host’s TX line and received by the printer’s RX pin. In this case, when the printer’s RTS signal is low (+12V) the printer requests the host to send data. When the RTS signal is high (-12V) the printer tells the host to stop sending data.

DB-9 Serial connector

Figura 9

Logic Level Voltage

0+ 12 V

1- 12 V

DB - 9		DB - 9
2	- RxD	2	- RxD
3	- TxD	3	- TxD
7	- RTS	7	- RTS
8 - CTS		8 - CTS
4	- DTR	4 -		NC
6	- DSR	6 -		NC
1	- DCD	1	-	NC
5	- GND	5	- GND
	PC	Printer

Pin	Sign	Direction	Description
2	Rx	IN	Through this pin the data are received by the printer.
3	Tx	OUT	Through this pin the data are transmitted from the printer to the
			device to her connected.
7	RTS	OUT	When in low level the printer requests the sending of data. When in
			high level the printer is without document.
8	CTS	IN	When in low level, the printer sends data (if there is). When in high
			level, the printer for of sending data, if she is sending.
5	GND		Logic ground.

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