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Serial Submenu

Interface Type

This parameter allows you to select either the RS-232 or RS-422

serial port interface.

Data Protocol

You can select one of the following serial interface protocols to

meet the host interface requirements.

• XON / XOFF (default). The printer controls the flow of

communication from the host by turning the transmission on

and off. In some situations, such as when the buffer is full or the

timing of signals is too slow or too fast, the printer will tell the

host to stop transmission by sending an XOFF character. An

XOFF character is sent when the number of empty bytes in the

buffer is less than or equal to 25 percent of the buffer size. If the

host keeps sending data after an XOFF is sent, the printer

firmware will continue to send an XOFF for every 16 characters

received. When cleared, the printer will resume receiving data

(XON). The data does not have any End of Text codes;

XON / XOFF is a non-block protocol.

• ETX / ACK. End of Text / Acknowledge. The host controls the

flow of communication to the printer by sending a block of data

and ending the block with an End of Text (ETX) signal. When

the printer receives the ETX signal, it will acknowledge the

ETX, thereby acknowledging it has received the entire block of

data.

• ACK / NAK. ACK means acknowledge; the device

acknowledges it has accepted a transmission. NAK means

negative acknowledge; the device did not receive the

transmission.

Oki MICROLINE MX Series User Manual

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