问题陈述:
我正在尝试构建一个简单的应用程序来读取QR /条形码信息并向用户显示显示(首选C /或Python)。
读取/写入串行数据不是问题。我可以管理它。
对于我正在使用的扫描仪型号,文档位于:https://drive.google.com/folderview?id=0B60pejPe6yiSQXAwWVFxZjRlR2s&usp=sharing
我唯一的困惑是形成框架SSI命令。
我看到很多这方面的例子。但是,我仍然无法明确遵循逻辑。
unsigned char ledOn[] = {0x05, 0xE7, 0x04, 0x00, 0x0D, 0x00};
unsigned char SSIBuffer[] = {0x00, 0xC6, 0x04, 0x08, 0x11, 0xEE, 0x01};
以上是我从Stackoverflow(Send data to a barcode scanner over RS232 serial port)得到的一些例子:
通过与上面的扫描仪参考文档进行比较,我解读了这条消息以便进一步理解。
问题-1
在文件中,STATUS字段讨论了4个BIT数据:
Bit 0: Retransmit
0 = First transmission
1 = Subsequent transmission
Bit 1: Continuation
0 = Last packet of a multipacket message
1 = Intermediate packet
我不清楚何时会设置上述位及其含义。
问题-2
ledOn[] = {0x05, 0xE7, 0x04, 0x00, 0x0D, 0x00};
Length(Byte-1)
Command(Byte-2)( LED_ON)
Decoder(Byte-3)
Status(Byte-4)
LED Selection(Byte-5) //**Don’t know where to get this info**
SSIBuffer[] = {0x00, 0xC6, 0x04, 0x08, 0x11, 0xEE, 0x01};
Length(Byte-1) (Will change the buffer later from 0)
Command(Byte-2) (PARAM_SEND)
Decoder(Byte-3)
Status(Byte-4) – Making barcode to set this config permenanent
BEEP_CODE(Byte-5)
Param_data (Byte-6) (Decode Data Packet Format – ref-pl3307)
Param_value(Byte-7)
再次参考我看到的数据表(SE3300型号)的许多操作模式。我想我应该使用具有电平触发模式的正常解码模式。我对使用“快照模式”有什么好处感到困惑。
Normal Decode Mode
Level Trigger Mode Procedure
Picklist in Level Trigger Mode Procedure
Presentation Mode Procedure
Auto-AIM Mode Procedure
最后,如何加入多个命令?
例如,如果我需要使用级别触发模式程序,根据数据表,这些是涉及的步骤:
The system is initialized as follows:
• The host sends the Aim Off command.
• The host sends the Illumination Off command.
• The host sends the Acquisition Stop command.
• The host sends the Barcode Decode mode command.
• The SE3300 optimizes the image output for bar code decoding.
• The SE3300 enters standby mode (or low power mode if enabled).
Upon a trigger pull:
• The host sends the Illumination On command.
• The SE3300 exits standby mode (or low power mode if enabled).
• The host sends the Aim On command.
• The host sends the Acquisition Start command.
• The SE3300 begins outputting images.
• The host attempts to decode the images.
Upon a good decode or trigger release:
• The host sends the Acquisition Stop command.
• The SE3300 stops outputting images.
• The host sends the Aim Off command.
• The host sends the Illumination Off command.
• The SE3300 enters standby mode (or low power mode if enabled).
有人可以指导我使用SSI命令为此形成一个简单的流程吗?