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Not raising DTR about osx-pl2303 HOT 1 OPEN

candlerb commented on July 28, 2024

Not raising DTR

from osx-pl2303.

Comments (1)

candlerb commented on July 28, 2024

I found a simple workaround: disable DTR/DSR handshaking in the driver.

diff --git a/osx_pl2303.h b/osx_pl2303.h
index a92d6b2..78f5337 100644
--- a/osx_pl2303.h
+++ b/osx_pl2303.h
@@ -83,7 +83,7 @@
 #define CAN_NOTIFY                             ( PD_RS232_N_MASK )
 #define EXTERNAL_MASK                  ( PD_S_MASK | (PD_RS232_S_MASK & ~PD_RS2
 #define INTERNAL_DELAY                 ( PD_RS232_S_LOOP )
-#define DEFAULT_AUTO                   ( PD_RS232_A_DTR | PD_RS232_A_RFR | PD_RS232_A_CTS | PD_RS232_A_DSR )
+#define DEFAULT_AUTO                   ( PD_RS232_A_RFR | PD_RS232_A_CTS )
 #define DEFAULT_NOTIFY                 0x00
 #define DEFAULT_STATE                  ( PD_S_TX_ENABLE | PD_S_RX_ENABLE | PD_R

In my opinion, using DTR/DSR for handshaking is misguided. This is what RTS and CTS are for. If your incoming buffer fills and you drop DTR, then most modems will drop the call!!

However in any case it seems that it doesn't work properly, because DTR isn't raised in the first place.

from osx-pl2303.

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