I have a problem with Supreme 20 and IFC command. Initial configuration looks like this:
After these commands:
Q:0 V:1 S0:000 S2:043 S3:013 S4:010 S5:008
+CR:0 +CRC:0 +CMEE:0 +CBST:0,0,1
+SPEAKER:1 +ECHO:0,127 &C:1 &D:0 %C:0
+IPR:19200 +ICF:3,4 +IFC:0,0
IFC=0,0 means NO flow control in both directions and CTS always high. But it’s not. It’s changes according to DTR .
Any ideas why it happens like this? My hardware uses CTS as modem present control. I can’t control DTR.
M1306B with the same configuration works ok. I did not find any info about IFC changes in delta.