GOpen()

GCLIB_DLL_EXPORTED GReturn GCALL GOpen	(	GCStringIn	address,
		GCon *	g
	)

Open a connection to a Galil Controller.

Parameters

address	Null-terminated address string. See table below.
g	Pointer to user's GCon variable. On success, the library will fill the user's variable with the handle to use for the rest of the connection. A valid g value is nonzero.

Returns

The success status or error code of the function. See gclib_errors.h for possible values.

address switch	Meaning	Arguments (default), other options	Examples
--address	Simple address to hardware	IP address, PCI, COM port	--address COM1
-a	shorthand for --address	See Address Ranges below	-a GALILPCI1
{no switch}	--address is implicit for any lone token		192.168.0.42
--baud	Baud rate	(115200), valid baud...	COM2 --baud 19200
-b	shorthand for --baud		COM3 -b 38400
--command	Command-and-response socket protocol	(TCP), UDP	192.168.0.42 --command TCP
-c	shorthand for --command		192.168.0.42 -c UDP
--direct	Connect directly to hardware instead of via gcaps		-a GALILPCI2 --direct
-d	shorthand for --direct		GALILPCI2 -d
--subscribe	Subscribe to messages, data records, and/or interrupts	(NONE), MG, DR, EI, ALL	192.168.0.42 --subscribe MG
-s	shorthand for --subscribe		192.168.0.42 -s DR -s EI
--timeout	timeout in ms	(5000), 0-65535	192.168.0.42 --timeout 5000
-t	shorthand for --timeout		GALILPCI2 -t 500
--unsolicited	Unsolicited socket protocol	(UDP), NONE	192.168.0.42 --unsolicited NONE
-u	shorthand for --unsolicited		192.168.1.42 -u UDP
The following address switches are deprecated and will be unavailable starting July 1st, 2020.
--p1	Primary port for command-and-response traffic	(23), valid port number	192.168.0.42 --p1 5000
--p2	Secondary port for unsolicited traffic	(60007), valid port number	192.168.0.42 --p2 5000

Operating System	Address Range	Notes
Windows	COM1 - COM256	RS232 and USB-to-serial
Linux	/dev/ttyS0 - /dev/ttyS255	RS232
Linux	/dev/ttyUSB0 - /dev/ttyUSB255	USB-to-serial, e.g. DMC-4103
Windows	GALILPCI1 - GALILPCI8	PCI
Linux	/dev/galilpci0 - /dev/galilpci7	PCI

See x_examples.cpp for an example.

When connecting to a network device, if the command-and-response socket is opened successfully but the unsolicited socket fails, GOpen() will still complete successfully. This allows connection to a Galil controller when only one Ethernet handle is available. Unsolicited traffic will not be accessible in this case.