Epson XDT manual Operating the Instrument, Interfacing to the RS-232 option, Starting up

Section 3: Instrument

3.3.2.5 Interfacing to the RS-232 option

The optional RS-232C interface is provided on the P1 connector. The configuration is 9600 baud, Even Parity, 8 Bits, 1 Stop, all received characters are echoed. The ground of the RS-232C inter- face is connected to the frame (AC power) ground however it is isolated from the sensor ground, see section 3.1.1.

To connect the instrument to a Personal Computer a 3 conductor cable is required; with wires to be placed in the screw terminals of the XDT at one end, and with either a DB9 or DB25 female connector at the other end:

Signal Name	instrument P1	DB9 pin	or DB25 pin
	pin #
Transmit Data	9 TXD or Tx	2		3
Receive Data	10 RXD or Rx	3		2
Signal Ground	11 GND	5		7
RTS	n.c.	7		4
CTS	n.c.	8		5
DTR	n.c.	4		20
DSR	n.c.	6		6

Note that some Personal Computer Programs may require that RTS & CTS and/or DTR & DSR are jumpered for proper operation. This jumpering may be accomplished at the DB9 or DB25 connector.

CAUTION: Connecting the RS-232C interface on instruments which do not have the option installed, will damage the instrument.

Refer to appendix K for details on the protocol used on the RS-232C interface.

3.4 Operating the Instrument

3.4.1 Starting up

The instrument is ready for use as soon as the power cabling is connected. When power is applied the instrument will initialize its program and for a moment display XEN, then it will enter the Operating State. If the MODE button is held pressed while the instrument is performing its power-up initialization, it will enter the Set-Up State, which allows the user to select setup vari- ables of the instrument.

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