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Oneliner to get / read the serial buffer and return the value to the standard output

Batch script to read/write data using COM portSerial port output buffer size in Windows 7reading serial port blocks for unknown reasonReading data from serial port from Arduino on Windows via PHP. Data not matching serial monitor outputVBScript read text file created in windows terminal substitutes characterstty - write/read to uart scriptsending serial commands to arduinoecho command to serial port in LinuxRead/Write on Serial Port in Windows Universal PlatformReading serial commands takes too much timeProblem with passing constantly reading serial buffer data to another class

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;

I'm pretty sure this question should have been asked before, but I can't find the answer. I want to read the content of the serial buffer and echo it to the console / terminal / standard output.

Requirements:

CMD / batch commands, no powershell

it must be a oneliner

preferably using copy, type, more and other simple commands like these.

Attempts:

A. First assuming I have set the parameters:

mode COM7:9600,N,8,1,P

Then from here I have tried

copy COM7 CON

and

type COM7

but it just doesn't return anything.

B. Also answers on this page are for copying the content of the serial buffer to a file, but I need to print it to the terminal or at least store it in a variable.

C. From here I also tried:

set /P "var=" < COM7 & echo %var%

but it just returns %var% obviously not reading the buffer. Adding the cmd /V:ON /C at the beginning of the above command also did not help.

D. from this page

copy COM7 > CON

and

copy COM7 2>&1

and

copy COM7 | more

all led to the error:

Access is denied.
0 file(s) copied.

I would appreciate if you could help me find the right command. Thanks for your help in advance.

asked Mar 21 at 23:03

Foad

1,78321335

1

I'm afraid I can't test on my computer. Anyway, variant A. seems reasonable to me, variant C. as well; variant D. however seems to be useless as there is no copy destination given (when copying files, copy uses the original file name together with the current directory as the default dest., but when a device like com# is given, it might just mirror the data back, like copy con mirrors back to con). Nevertheless, all these commands need to receive some end marker to terminate (end-of-file, ASCII 26, Ctrl+Z, and for set /P, end-of-line too; perhaps a null byte might work too?)...

– aschipfl
Mar 22 at 0:02

@aschipfl so if I have understood you correctly, A and C are the right direction. Would you be kind to elaborate?

– Foad
Mar 22 at 0:05

2

As I said, I can't test it, so it's a bit difficult. I don't know where the Access denied. message should come from (by the way, does this only relate to attempt D.?). Anyway, variant A. is of correct syntax at least. Variant C. cannot work as written, since echo %var% returns the value of var present before the whole line executes (sorry, I forgot this before); you could use set /P "var=" < COM7 & call echo %^var%, or enable delayed expansion by running cmd with the /V option. But all relies on terminated text data (end-of-file, etc.).

– aschipfl
Mar 22 at 0:16

1

N. B.: You could also try more < com7...

– aschipfl
Mar 22 at 0:16

1

@Foad Does the other computer have com7 enabled? if not, find out which com it uses.

– Gerhard Barnard
Mar 22 at 12:05

|
show 3 more comments

I'm pretty sure this question should have been asked before, but I can't find the answer. I want to read the content of the serial buffer and echo it to the console / terminal / standard output.

Requirements:

CMD / batch commands, no powershell

it must be a oneliner

preferably using copy, type, more and other simple commands like these.

Attempts:

A. First assuming I have set the parameters:

mode COM7:9600,N,8,1,P

Then from here I have tried

copy COM7 CON

and

type COM7

but it just doesn't return anything.

B. Also answers on this page are for copying the content of the serial buffer to a file, but I need to print it to the terminal or at least store it in a variable.

C. From here I also tried:

set /P "var=" < COM7 & echo %var%

but it just returns %var% obviously not reading the buffer. Adding the cmd /V:ON /C at the beginning of the above command also did not help.

D. from this page

copy COM7 > CON

and

copy COM7 2>&1

and

copy COM7 | more

all led to the error:

Access is denied.
0 file(s) copied.

I would appreciate if you could help me find the right command. Thanks for your help in advance.

asked Mar 21 at 23:03

Foad

1,78321335

1

I'm afraid I can't test on my computer. Anyway, variant A. seems reasonable to me, variant C. as well; variant D. however seems to be useless as there is no copy destination given (when copying files, copy uses the original file name together with the current directory as the default dest., but when a device like com# is given, it might just mirror the data back, like copy con mirrors back to con). Nevertheless, all these commands need to receive some end marker to terminate (end-of-file, ASCII 26, Ctrl+Z, and for set /P, end-of-line too; perhaps a null byte might work too?)...

– aschipfl
Mar 22 at 0:02

@aschipfl so if I have understood you correctly, A and C are the right direction. Would you be kind to elaborate?

– Foad
Mar 22 at 0:05

2

As I said, I can't test it, so it's a bit difficult. I don't know where the Access denied. message should come from (by the way, does this only relate to attempt D.?). Anyway, variant A. is of correct syntax at least. Variant C. cannot work as written, since echo %var% returns the value of var present before the whole line executes (sorry, I forgot this before); you could use set /P "var=" < COM7 & call echo %^var%, or enable delayed expansion by running cmd with the /V option. But all relies on terminated text data (end-of-file, etc.).

– aschipfl
Mar 22 at 0:16

1

N. B.: You could also try more < com7...

– aschipfl
Mar 22 at 0:16

1

@Foad Does the other computer have com7 enabled? if not, find out which com it uses.

– Gerhard Barnard
Mar 22 at 12:05

|
show 3 more comments

I'm pretty sure this question should have been asked before, but I can't find the answer. I want to read the content of the serial buffer and echo it to the console / terminal / standard output.

Requirements:

CMD / batch commands, no powershell

it must be a oneliner

preferably using copy, type, more and other simple commands like these.

Attempts:

A. First assuming I have set the parameters:

mode COM7:9600,N,8,1,P

Then from here I have tried

copy COM7 CON

and

type COM7

but it just doesn't return anything.

B. Also answers on this page are for copying the content of the serial buffer to a file, but I need to print it to the terminal or at least store it in a variable.

C. From here I also tried:

set /P "var=" < COM7 & echo %var%

but it just returns %var% obviously not reading the buffer. Adding the cmd /V:ON /C at the beginning of the above command also did not help.

D. from this page

copy COM7 > CON

and

copy COM7 2>&1

and

copy COM7 | more

all led to the error:

Access is denied.
0 file(s) copied.

I would appreciate if you could help me find the right command. Thanks for your help in advance.

asked Mar 21 at 23:03

Foad

1,78321335

I'm pretty sure this question should have been asked before, but I can't find the answer. I want to read the content of the serial buffer and echo it to the console / terminal / standard output.

Requirements:

CMD / batch commands, no powershell

it must be a oneliner

preferably using copy, type, more and other simple commands like these.

Attempts:

A. First assuming I have set the parameters:

mode COM7:9600,N,8,1,P

Then from here I have tried

copy COM7 CON

and

type COM7

but it just doesn't return anything.

B. Also answers on this page are for copying the content of the serial buffer to a file, but I need to print it to the terminal or at least store it in a variable.

C. From here I also tried:

set /P "var=" < COM7 & echo %var%

but it just returns %var% obviously not reading the buffer. Adding the cmd /V:ON /C at the beginning of the above command also did not help.

D. from this page

copy COM7 > CON

and

copy COM7 2>&1

and

copy COM7 | more

all led to the error:

Access is denied.
0 file(s) copied.

I would appreciate if you could help me find the right command. Thanks for your help in advance.

windows batch-file cmd serial-port serial-communication

asked Mar 21 at 23:03

Foad

1,78321335

asked Mar 21 at 23:03

Foad

1,78321335

asked Mar 21 at 23:03

Foad

1,78321335

asked Mar 21 at 23:03

Foad

1,78321335

asked Mar 21 at 23:03

Foad

1,78321335

1

I'm afraid I can't test on my computer. Anyway, variant A. seems reasonable to me, variant C. as well; variant D. however seems to be useless as there is no copy destination given (when copying files, copy uses the original file name together with the current directory as the default dest., but when a device like com# is given, it might just mirror the data back, like copy con mirrors back to con). Nevertheless, all these commands need to receive some end marker to terminate (end-of-file, ASCII 26, Ctrl+Z, and for set /P, end-of-line too; perhaps a null byte might work too?)...

– aschipfl
Mar 22 at 0:02

@aschipfl so if I have understood you correctly, A and C are the right direction. Would you be kind to elaborate?

– Foad
Mar 22 at 0:05

2

As I said, I can't test it, so it's a bit difficult. I don't know where the Access denied. message should come from (by the way, does this only relate to attempt D.?). Anyway, variant A. is of correct syntax at least. Variant C. cannot work as written, since echo %var% returns the value of var present before the whole line executes (sorry, I forgot this before); you could use set /P "var=" < COM7 & call echo %^var%, or enable delayed expansion by running cmd with the /V option. But all relies on terminated text data (end-of-file, etc.).

– aschipfl
Mar 22 at 0:16

1

N. B.: You could also try more < com7...

– aschipfl
Mar 22 at 0:16

1

@Foad Does the other computer have com7 enabled? if not, find out which com it uses.

– Gerhard Barnard
Mar 22 at 12:05

|
show 3 more comments

1

I'm afraid I can't test on my computer. Anyway, variant A. seems reasonable to me, variant C. as well; variant D. however seems to be useless as there is no copy destination given (when copying files, copy uses the original file name together with the current directory as the default dest., but when a device like com# is given, it might just mirror the data back, like copy con mirrors back to con). Nevertheless, all these commands need to receive some end marker to terminate (end-of-file, ASCII 26, Ctrl+Z, and for set /P, end-of-line too; perhaps a null byte might work too?)...

– aschipfl
Mar 22 at 0:02

@aschipfl so if I have understood you correctly, A and C are the right direction. Would you be kind to elaborate?

– Foad
Mar 22 at 0:05

2

As I said, I can't test it, so it's a bit difficult. I don't know where the Access denied. message should come from (by the way, does this only relate to attempt D.?). Anyway, variant A. is of correct syntax at least. Variant C. cannot work as written, since echo %var% returns the value of var present before the whole line executes (sorry, I forgot this before); you could use set /P "var=" < COM7 & call echo %^var%, or enable delayed expansion by running cmd with the /V option. But all relies on terminated text data (end-of-file, etc.).

– aschipfl
Mar 22 at 0:16

1

N. B.: You could also try more < com7...

– aschipfl
Mar 22 at 0:16

1

@Foad Does the other computer have com7 enabled? if not, find out which com it uses.

– Gerhard Barnard
Mar 22 at 12:05

I'm afraid I can't test on my computer. Anyway, variant A. seems reasonable to me, variant C. as well; variant D. however seems to be useless as there is no copy destination given (when copying files, copy uses the original file name together with the current directory as the default dest., but when a device like com# is given, it might just mirror the data back, like copy con mirrors back to con). Nevertheless, all these commands need to receive some end marker to terminate (end-of-file, ASCII 26, Ctrl+Z, and for set /P, end-of-line too; perhaps a null byte might work too?)...

– aschipfl
Mar 22 at 0:02

@aschipfl so if I have understood you correctly, A and C are the right direction. Would you be kind to elaborate?

– Foad
Mar 22 at 0:05

As I said, I can't test it, so it's a bit difficult. I don't know where the Access denied. message should come from (by the way, does this only relate to attempt D.?). Anyway, variant A. is of correct syntax at least. Variant C. cannot work as written, since echo %var% returns the value of var present before the whole line executes (sorry, I forgot this before); you could use set /P "var=" < COM7 & call echo %^var%, or enable delayed expansion by running cmd with the /V option. But all relies on terminated text data (end-of-file, etc.).

– aschipfl
Mar 22 at 0:16

N. B.: You could also try more < com7...

– aschipfl
Mar 22 at 0:16

@Foad Does the other computer have com7 enabled? if not, find out which com it uses.

– Gerhard Barnard
Mar 22 at 12:05

|
show 3 more comments

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