Zebra MP6000 Informations techniques télécharger pdf (Page 130)

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2 - 38 MP6000 BAR CODE PROGRAMMING GUIDE

Software Handshaking

This parameter offers control of the data transmission process in addition to, or instead of, that offered by

hardware handshaking. There are five options.

If software handshaking and hardware handshaking are both enabled, hardware handshaking takes

precedence.

Options:

•

None: Select this to transmit data immediately. The MP6000 expects no response from the host.

•

ACK/NAK: If you select this option, after transmitting data, the MP6000 expects either an ACK or NAK

response from the host. When it receives a NAK, the scanner transmits the same data again and waits

for either an ACK or NAK. After three unsuccessful attempts to send data after receiving NAKs, the

MP6000 issues an error indication and discards the data.

The MP6000 waits up to the programmable Host Serial Response Timeout to receive an ACK or NAK. If

the scanner does not get a response in this time, it issues an error indication and discards the data.

There are no retries when a timeout occurs.

•

ENQ: If you select this option, the MP6000 waits for an ENQ character from the host before transmitting

data. If it does not receive an ENQ within the Host Serial Response Timeout, the MP6000 issues an error

indication and discards the data. The host must transmit an ENQ character at least every Host Serial

Response Timeout to prevent transmission errors.

•

ACK/NAK with ENQ: This combines the two previous options. For re-transmissions of data, due to a NAK

from the host, an additional ENQ is not required.

•

XON/XOFF: An XOFF character turns the MP6000 transmission off until the scanner receives an XON

character. There are two situations for XON/XOFF:

• The MP6000 receives an XOFF before has data to send. When the scanner has data to send, it waits

up to Host Serial Response Timeout for an XON character before transmission. If it does not receive

the XON within this time, the MP6000 issues an error indication and discards the data.

• The MP6000 receives an XOFF during a transmission. Data transmission then stops after sending the

current byte. When the MP6000 receives an XON character, it sends the rest of the data message.

The MP6000 waits indefinitely for the XON.

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Zebra MP6000 Informations techniques Page 130

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