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AT^SIST does not have an effect on DSR line level (BGS2-W)

negotoro

March 12, 2014 - 1:31pm, 3117 views

Hi there,

I have a question regarding the usage of DSR line with Transparent TCP Client. In my application I use the serial interface ASC0 with all the provided lines and I'd like to find out at a given time if I'm in the transparent mode or command mode. I thought I can poll the DSR line level using "AT&S1" configuration. According to this configuration the DSR should be OFF when the ME is in command mode and ON if ME is in data mode.

Unfortunately I don't see a change in the DSR line when I enter the transparent access mode (using AT^SIST command). I tried to establish a GPRS connection to my PC using packet domain related commands with "ATD*99#" command and in this case I can see the line change accordingly.

Can you tell me what I'm doing wrong or usage of DSR line with transparent access mode simply not possible (although it makes sense)?