87
The host transmits this message to change the scanner’s parameters. Be sure the Change Type bit (bit 6
of the Status byte) in the Status field is set as desired.
Scanner Requirements
When the scanner receives a PARAM_SEND, it interprets and stores the parameters, then ACKs
the command (if ACK/NAK handshaking is enabled). These parameters are stored permanently
only if the Change Type (bit 6 of the Status byte) is set to 1. Frequent permanent changes are not
recommended due to the limited write-cycles of flash memory. If bit 6 is set to 0 the changes are
temporary, and are lost when the engine is powered down.
If the scanner changes the parameter, it issues the requested beep sequence and stores the
requested parameter values.
Figure 4-1 Host demands scanner to change parameter
The scanner issues a PARAM_SEND in response to a PARAM_REQUEST from the host. It
responds to the PARAM_REQUEST message by sending all supported parameter values. No value
is sent for any unsupported parameter. If none of the requested values is supported, the scanner
responds to the host with NAK.
When the scanner sends PARAM_SEND message, the Change Type bit (bit 6 of Status byte) can
be ignored.
Figure 4-2 Host queries scanner’s parameter
Host
Engine
(1)
PARAM REQUEST
(2)
PARAM_SEND
Host
Engine
(1)
PARAM_SEND
(2)
Store parameters and ACK
Содержание ES910
Страница 1: ...ES910 Embedded Laser Barcode Scanner User Manual Version ES910_UM_EN_V1 1 7 ...
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Страница 10: ...4 1 4 Decode zone Figure 1 2 High density series ...
Страница 11: ...5 Figure 1 3 Long range series ...
Страница 106: ...100 11 Configuration alphanumeric entry barcode To finish parameter setting please scan the bar code below ...