this is output from another program called Advanced Serial Port Monitor. I hope it helps.
<20171005130029.747 SYS>
COM is open
<20171005130029.747 SYS>
In/out queue size 4096/0
<20171005130029.747 SYS>
Set timeouts: ReadInterval=65535, ReadTotalTimeoutMultiplier=0, ReadTotalTimeoutConstant=0, WriteTotalTimeoutMultiplier=0, WriteTotalTimeoutConstant=0
<20171005130029.747 SYS>
RTS on
<20171005130029.747 SYS>
DTR on
<20171005130029.747 SYS>
Purge the serial port: RXABORT, RXCLEAR, TXABORT, TXCLEAR
<20171005130029.753 SYS>
Baud rate 9600
<20171005130029.753 SYS>
RTS on
<20171005130029.753 SYS>
DTR on
<20171005130029.753 SYS>
Data bits=8, Stop bits=1, Parity=None
<20171005130029.753 SYS>
Set chars: Eof=0x00, Error=0x00, Break=0x00, Event=0x00, Xon=0x11, Xoff=0x13
<20171005130029.753 SYS>
Handflow: ControlHandShake=(DTR_CONTROL), FlowReplace=(AUTO_TRANSMIT, AUTO_RECEIVE, TRANSMIT_TOGGLE, RTS_CONTROL), XonLimit=1024, XoffLimit=1024
<20171005130029.754 TX>
@ [len=1]
<20171005130029.754 TX>
ZI [len=2]
<20171005130037.281 TX>
@ [len=1]
<20171005130037.281 TX>
ZI [len=2]
<20171005130038.766 TX>
I4 [len=2]
<20171005130038.766 RX>
I4 A "B346986532" [len=17]
<20171005130038.766 RX>
I4 A "B346986532" [len=17]
<20171005130041.219 TX>
M19 [len=3]
<20171005130044.642 TX>
C0 1 1 [len=6]
<20171005130044.642 RX>
I4 A "B346986532" [len=17]
<20171005130044.642 RX>
M19 A 500.000 g [len=15]
<20171005130049.158 TX>
C2 [len=2]
<20171005130053.123 TX>
C0 0 0 [len=6]
<20171005130053.123 RX>
C0 A [len=4]
<20171005130053.123 RX>
C2 B [len=4]
<20171005130053.123 RX>
C2 " 0.000 g" [len=17]
<20171005130053.123 SYS>
Purge the serial port: RXABORT, RXCLEAR, TXABORT, TXCLEAR
<20171005130053.123 SYS>
Purge the serial port: RXABORT, RXCLEAR, TXABORT, TXCLEAR
<20171005130053.123 SYS>
RTS off
<20171005130053.123 SYS>
DTR off
<20171005130053.186 SYS>
COM is closed