Serial Interface

Note:

Synchronization : Signal level (ELA-232D) : MARK (logical 1) : SPACE (logical 0) : Word length : Start bit : Data bit : Parity bit : Stop bit : Baud rate : Handshaking :

Asynchronous

-3Vto-25V +3Vto+25V

1 bit 8 bit

Odd, Even, Non, of Ignore 1 bit or more

2400, 4800, 9600 or 19200 bps DTR signal or X-ON / X-OFF Indicates that the printer cannot receive data. Indicates that the printer is ready to receive data. The DTR signal is MARK and X-OFF code (DC3, 13h) is transmitted when the rest of the input buffer becomes 256-byte. The DTR signal is SPACE and X-ON code (DC1, 11 h) is transmitted when the rest of the input buffer is regained 256-byte.

Error handling : When parity error is detected, the received byte is changed to the

"*" character code. Overrun error and framing error are ignored. Connector : 25 pin sub-miniature D-shell connector (female)

Connector pin assignment and signals : Refer to Table 1-12.

Table 1-12. Signal and Connector Pin Assignment (EIA-232D)

Pin No.

Signal Name

In / Out*

Functional Description

2

TXD

Out

Transmit data.

20

DTR

Out

Indicates that the printer is ready to receive data or not.

11

REV

Out

Connected directly to the DTR signal.

4

RTS

Out

Request to send. always SPACE level when the printer is powered on. Pulled up to +12 V via 4.7K-ohm resistor.

3

RXD

In

Receive data

7

Signal GND

-

Signal GND

1

Chassis GND

-

Chassis GND

Other

NC

-

Not used. Not connected.

Note: * In/Out refers to the direction of signal flow from the printer's point of view.

Note: * In/Out refers to the direction of signal flow from the printer's point of view.

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