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Solution:
When a string like $abcdef is sent to ADAM-4521, only $abc is transferred to the connected RS-232 device. The characters after terminal character will be ignored. There are two undocumented commands that can be used if you want to send characters after terminal character. The commands are:
1. &AA8DD Open/Close data gate, AA is the module address
2. &AA9 Read Open/Close data gate status
For example:
&AA810 command will open data gate but will not save this status to EEPROM
&AA811 command will open data gate and save this status to EEPROM
&AA800 command will close data gate but won save this status to EEPROM
&AA801 command will close data gate and save this status to EEPROM
When data gate is opened, ADAM-4521 will act just like ADAM-4520. All data will be sent without checking address or .
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