User's Manual

when a time-out occurs.

z ENQ: If you select this option, the digital scanner waits for an ENQ character

from the host before transmitting data. If it does not receive an ENQ within the

Host Serial Response Time-out, the digital scanner issues an error indication

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

Host Serial Response Time-out to prevent transmission errors.

z 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.

z XON/XOFF: An XOFF character turns the digital scanner transmission off until

the scanner receives an XON character. There are two situations for

XON/XOFF:

¾ The digital scanner receives an XOFF before has data to send. When the

scanner has data to send, it waits up to Host Serial Response Time-out for

an XON character before transmission. If it does not receive the XON

within this time, the digital scanner issues an error indication and discards

the data.

¾ The digital scanner receives an XOFF during a transmission. Data

transmission then stops after sending the current byte. When the digital

scanner receives an XON character, it sends the rest of the data message.

The digital scanner waits indefinitely for the XON.