python - C# .NET serial port connects, doesn't read or write -

python - C# .NET serial port connects, doesn't read or write -

i'm using c# , .net 4.5, visual studio 2012 compiler/ide open , interact serial port. code designed connect qsb quadrature-to-usb converter digital.

here code i'm using open port , connect.

this.port = new serialport(); this.port.baudrate = 230400; this.port.portname = "com9"; this.port.parity = parity.none; this.port.handshake = handshake.none; this.port.databits = 8; this.port.stopbits = stopbits.one; this.port.open();

setting breakpoint after this.port.open() allows me verify serial port indeed connected. in section of code, next called in response button push:

this.port.writeline("w168");

this command *should cause hardware spin motor, , in fact if send command using putty, or using python script wrote (both using same settings c# code does). yet nil happens. can open port in putty or python , execute command expected results, , run c# code , nil happens.

am missing c# specific prevents working?

for it's worth, here working python code:

ser = serial.serial("com9", 230400, timeout=1) ser.write(b"w168\n")

link pyserial documentation: http://pyserial.sourceforge.net/pyserial_api.html#classes

default values fields mentioned in c# code not mentioned in python phone call above are:

bytesize = 8 parity = none stopbits = one xonxoff = false rtscts = false dsrdtr = false

when working serial ports in c# there 1 thing remember when establishing connection. if set handshake value none this:

this.port.handshake = handshake.none;

then need set few more parameters connection completed, , are:

this.port.dtrenable = true; this.port.rtsenable = true;

the reaso because dtrenable means this:

data terminal ready (dtr) signal

msdn explains dtr means this:

data terminal ready (dtr) typically enabled during xon/xoff software handshaking , request send/clear send (rts/cts) hardware handshaking, , modem communications.

rtsenable means this:

request send (rts) signal

msdn explains rts means this:

the request transmit (rts) signal typically used in request send/clear send (rts/cts) hardware handshaking.

together these 2 parameters handle handshaking of serial port communications without having define between master , slave.

c# python .net serial-port