5-91
Parameter Menus
Software Handshaking (Continued)
ACK/NAK
When this option is selected, after transmitting data, the cradle expects either an ACK,
Acknowledge
, or NAK,
Negative Acknowledge
, response from the host. Whenever a NAK is
received, the cradle transmits the same data again and waits for either an ACK or NAK. After
three unsuccessful attempts to send data when NAKs are received, the cradle issues an error
indication and discards the data.
The cradle waits up to the programmable Host Serial Response Time-out to receive an ACK
or NAK. If the cradle does not get a response in this time, it issues an error indication and
discards the data. There are no retries when a time-out occurs.
ACK/NAK
ENQ
When this option is selected, the cradle waits for an ENQ,
Enquiry
, character from the host
before transmitting data. If an ENQ is not received within two seconds, the cradle issues an
error indication and discards the data. The host must transmit an ENQ character at least
every two seconds to prevent transmission errors.
ENQ
ACK/NAK with ENQ
This combines the two previous options.
ACK/NAK with ENQ
Содержание P 370 RF
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Страница 77: ...5 17 Parameter Menus 5 RETRIES 6 RETRIES 7 RETRIES 8 RETRIES...
Страница 141: ...5 81 Parameter Menus Transmit Code ID Character Continued SYMBOL CODE ID CHARACTER AIM CODE ID CHARACTER NONE...
Страница 156: ...5 96 P 370 470 RF Scanner Product Reference Guide BAUD RATE 1200 BAUD RATE 2400...
Страница 157: ...5 97 Parameter Menus MCL Net Baud Rate Continued BAUD RATE 4800 BAUD RATE 9600 BAUD RATE 19200 BAUD RATE 38400...
Страница 163: ...5 103 Parameter Menus Numeric Bar Codes Continued 5 6 7 8 9...
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