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.
•None: When this option is selected, data is transmitted immediately. No response is expected from host.
•ACK/NAK: When this option is selected, after transmitting data, the scanner expects either an ACK or NAK response from the host. When a NAK is received, the scanner transmits the same data again and waits for either an ACK or NAK. After three unsuccess- ful attempts to send data when NAKs are received, the scanner issues an error indication and discards the data.
The scanner waits up to the programmable Host Serial Response
•ENQ: When this option is selected, the scanner waits for an ENQ character from the host before transmitting data. If an ENQ is not received within the Host Serial Response
•ACK/NAK with ENQ: This combines the two previous options. For
•XON/XOFF: An XOFF character turns the scanner transmission off until the scanner receives an XON character. There are two situations for XON/XOFF:
-XOFF is received before the scanner has data to send. When the scanner has data to send, it waits up to Host Serial Response
-XOFF is received during a transmission. Data transmission then stops after sending the current byte. When the scanner receives an XON character, it sends the rest of the data message. The scanner waits up to 30 seconds for the XON.
Product Reference Guide | 43 |
