Finding what an application sends to the Serial Port

[THT]

I have an application which connects to a device via a serial port.

Now the application is less than brilliant and doesnt do what i want anyway!

Heres what i need to do:

1) See what commands the program sends to the serial port
2) Attempt to reproduce this using Hyperterminal
3) Incorporate them into my program

Now im fine with 2 and 3, so i guess I just need to find what commands this application is sendning to the COM Port

Whats the best way to achieve this?

 

[THT]

Thanks for the replies

regmon and filemon are lifesavers so hopefully portmon will be just as good.

Doubt theres any info on SourceForge though HT

 

[THT]

portmon did the job:

0	0.00005615	LED.exe	IRP_MJ_CREATE	Serial0	SUCCESS	Options: Open 	
1	0.00000335	LED.exe	IOCTL_SERIAL_GET_TIMEOUTS	Serial0	SUCCESS		
2	0.00000223	LED.exe	IOCTL_SERIAL_SET_TIMEOUTS	Serial0	SUCCESS	RI:0 RM:10 RC:1000 WM:1 WC:1000	
3	0.00000196	LED.exe	IOCTL_SERIAL_GET_BAUD_RATE	Serial0	SUCCESS		
4	0.00000168	LED.exe	IOCTL_SERIAL_GET_LINE_CONTROL	Serial0	SUCCESS		
5	0.00000168	LED.exe	IOCTL_SERIAL_GET_CHARS	Serial0	SUCCESS		
6	0.00000168	LED.exe	IOCTL_SERIAL_GET_HANDFLOW	Serial0	SUCCESS		
7	0.00000168	LED.exe	IOCTL_SERIAL_GET_BAUD_RATE	Serial0	SUCCESS		
8	0.00000140	LED.exe	IOCTL_SERIAL_GET_LINE_CONTROL	Serial0	SUCCESS		
9	0.00000140	LED.exe	IOCTL_SERIAL_GET_CHARS	Serial0	SUCCESS		
10	0.00000140	LED.exe	IOCTL_SERIAL_GET_HANDFLOW	Serial0	SUCCESS		
11	0.00001006	LED.exe	IOCTL_SERIAL_SET_BAUD_RATE	Serial0	SUCCESS	Rate: 1200	
12	0.00000503	LED.exe	IOCTL_SERIAL_SET_RTS	Serial0	SUCCESS		
13	0.00000475	LED.exe	IOCTL_SERIAL_SET_DTR	Serial0	SUCCESS		
14	0.00000363	LED.exe	IOCTL_SERIAL_SET_LINE_CONTROL	Serial0	SUCCESS	StopBits: 1 Parity: NONE WordLength: 8	
15	0.00000140	LED.exe	IOCTL_SERIAL_SET_CHAR	Serial0	SUCCESS	EOF:0 ERR:0 BRK:0 EVT:0 XON:11 XOFF:13	
16	0.00000307	LED.exe	IOCTL_SERIAL_SET_HANDFLOW	Serial0	SUCCESS	Shake:80000001 Replace:80000043 XonLimit:2048 XoffLimit:512	
17	0.00000140	LED.exe	IOCTL_SERIAL_SET_QUEUE_SIZE	Serial0	SUCCESS	InSize: 4096 OutSize: 4096	
18	0.00000223	LED.exe	IOCTL_SERIAL_SET_WAIT_MASK	Serial0	SUCCESS	Mask: RXCHAR 	
19	0.00000223	LED.exe	IOCTL_SERIAL_PURGE	Serial0	SUCCESS	Purge: TXABORT RXABORT TXCLEAR RXCLEAR	
20	0.00000251	LED.exe	IOCTL_SERIAL_PURGE	Serial0	SUCCESS	Purge: TXABORT RXABORT TXCLEAR RXCLEAR	
21	0.00002375	LED.exe	IRP_MJ_WRITE	Serial0	SUCCESS	Length 1: .	
22	0.00000223	LED.exe	IOCTL_SERIAL_PURGE	Serial0	SUCCESS	Purge: TXABORT RXABORT TXCLEAR RXCLEAR	
23	0.00868043	LED.exe	IRP_MJ_WRITE	Serial0	SUCCESS	Length 1: .	
24	0.08353212	LED.exe	IOCTL_SERIAL_WAIT_ON_MASK	Serial0	CANCELLED		
25	0.00000223	LED.exe	IOCTL_SERIAL_PURGE	Serial0	SUCCESS	Purge: TXABORT RXABORT TXCLEAR RXCLEAR	
26	0.00827787	LED.exe	IRP_MJ_WRITE	Serial0	SUCCESS	Length 1: Y	
27	0.00000251	LED.exe	IOCTL_SERIAL_PURGE	Serial0	SUCCESS	Purge: TXABORT RXABORT TXCLEAR RXCLEAR	
28	0.00828318	LED.exe	IRP_MJ_WRITE	Serial0	SUCCESS	Length 1: .	
29	0.00000223	LED.exe	IOCTL_SERIAL_PURGE	Serial0	SUCCESS	Purge: TXABORT RXABORT TXCLEAR RXCLEAR	
30	0.00819769	LED.exe	IRP_MJ_WRITE	Serial0	SUCCESS	Length 1: .	
31	0.00000251	LED.exe	IOCTL_SERIAL_PURGE	Serial0	SUCCESS	Purge: TXABORT RXABORT TXCLEAR RXCLEAR	
32	0.00828094	LED.exe	IRP_MJ_WRITE	Serial0	SUCCESS	Length 1: .	
33	0.00000279	LED.exe	IOCTL_SERIAL_PURGE	Serial0	SUCCESS	Purge: TXABORT RXABORT TXCLEAR RXCLEAR	
34	0.00827647	LED.exe	IRP_MJ_WRITE	Serial0	SUCCESS	Length 1: .	
35	0.00000391	LED.exe	IOCTL_SERIAL_PURGE	Serial0	SUCCESS	Purge: TXABORT RXABORT TXCLEAR RXCLEAR	
36	0.00806387	LED.exe	IRP_MJ_WRITE	Serial0	SUCCESS	Length 1: .	
37	0.00000279	LED.exe	IOCTL_SERIAL_PURGE	Serial0	SUCCESS	Purge: TXABORT RXABORT TXCLEAR RXCLEAR	
38	0.00825831	LED.exe	IRP_MJ_WRITE	Serial0	SUCCESS	Length 1: .	
39	0.00000251	LED.exe	IOCTL_SERIAL_PURGE	Serial0	SUCCESS	Purge: TXABORT RXABORT TXCLEAR RXCLEAR	
40	0.00827982	LED.exe	IRP_MJ_WRITE	Serial0	SUCCESS	Length 1: F	
41	0.00000251	LED.exe	IOCTL_SERIAL_PURGE	Serial0	SUCCESS	Purge: TXABORT RXABORT TXCLEAR RXCLEAR	
42	0.00775657	LED.exe	IRP_MJ_WRITE	Serial0	SUCCESS	Length 1: .	
43	0.00000838	LED.exe	IRP_MJ_CLEANUP	Serial0	SUCCESS		
44	0.09149627	LED.exe	IRP_MJ_CLOSE	Serial0	SUCCESS