Juniper Systems Allegro DOS Manual - Manual (Page 206)

Page 5-46 MS-DOS
Generally, an output list is shown after SERPRN is invoked informing
you how the utility has set the communication port. You can disable the
output listing with the quiet mode parameter (q).
Example uses of SERPRN are shown below.
Syntax
Serprn com1 9600 n 8 1 x t10
Output
HM/JS Parallel to Serial Redirector
COM1 9600 n 8 1
LPT1 redirected to COM1
Handshaking XON
If the program is called with only the COM port specified, the program
default settings are used.
Syntax
Serprn com1
Output
HM/JS Parallel to Serial Redirector
COM1 9600 n 8 1
LPT1 redirected to COM1
No Handshaking
If the program is called without any command line parameters, a status
report is shown listing the settings that are currently in use for the serial
port.
Syntax
Serprn
Output
HM/JS Parallel to Serial Redirector
COM1 9600 n 8 1
LPT1 redirected to COM1
Handshaking XON CTS DSR
If the program is called with the ? parameter in the command line, it
returns a list of the available command line parameters.