OPENSER

Serial IO to the com ports on NT and to device files on Unix can be achieved using the sequential file statements. In addition certain control operations can be performed using the IOCTL function.

Serial IO can be handled via the OPENSEQ statement however the OPENSER statement has also been provided.

COMMAND SYNTAX

OPENSER Path,DevInfo| PIPE TO FileVar THEN | ELSE Statements

SYNTAX ELEMENTS

Path is the pathname of the required device.

DevInfo consists of the following:

Baud

baud rate required

Flow

y	X-ON X-OFF flow control (default)
n	no flow control
i	input flow control
o	output flow control

Parity

e	7 bit even parity
o	7 bit odd parity
n	8 bit no parity, (Default)
s	8 bit no parity, strip top bit

PIPE specifies the file is to be opened to a PIPE for reading.

NOTES

The PIPE functionality allows a process to open a PIPE, once opened then the process can execute a command via the WRITESEQ/SEND statement and then received the result back via the GET/READSEQ statements.

EXAMPLE

FileName = "/dev/tty01s" OPENSER FileName TO File ELSE STOP 201,FileName WRITESEQ "ls -ail" ON File,"" ;* ONLY for PIPEs LOOP Terminator = CHAR(10) WaitTime = 4 GET Input SETTING Count FROM File UNTIL Terminator RETURNING TermChar WAITING WaitTime THEN CRT "Get Ok, Input ":Input:" Count ":Count:"TermChar ":TermChar END ELSE CRT "Get Timed out Input ":Input:" Count ":Count:" TermChar ":TermChar END WHILE Input NE "" DO REPEAT

jBC