■ EN_LINK

Format	EN_LINK(P1,P2,P3)	Data Type	U
Function	Enables communication link P1 or sub-link P2 of communication link P1 when P3 is 1. Disables the specified communication link or sub-link when P3 is 0.
P1 (I/C)	The number of the communication link to be enabled or disabled.
P2 (I/C)	The node address of the sub-link to be enabled or disabled. If the specified communication link has no sub-link, this parameter is ignored. If the specified communication link has sub-links and you want to enable or disable the link itself, set this parameter to 0.
P3 (I/C)	To enable the specified communication link or sub-link, set this parameter to 1. To disable the specified communication link or sub-link, set this parameter to 0.
Example 1	ENABLE_LINK(1, 20, 0) /* Disable the sub-link, whose node address is 20, of communication link 1. */

■ LINK_STS

Format

P1 = LINK_STS(P2,P3 )

Data Type

Function

Gets the status of communication link P2 or sub-link P3 of communication link P2 and saves the result in P1.

P1 (I/C)

The word to receive the status of the specified communication link or sub-link. The status is a 16-bit value. The following table lists the meaning of each status value.

Status Value	Meaning	Status Value	Meaning
0	OK	14	Device busy
1	Overrun error	15	Unknown error
2	Break error	16	Link disabled
3	Parity error	17	Initialization failure
4	Framing error	18	Failed to send data
5	No response	19	Failed to receive data
6	Unrecognized response	20	Failed to open connection
7	Timeout	21	Connection not ready
8	Inactive CTS	22	Invalid sub-link
9	Checksum error	23	Invalid COM port
10	Command rejected	24	Error
11	Invalid address	255	Condition uncertain
12	Invalid range	65535	Failed to get status
13	Invalid request

P2 (I/C)

The number of the communication link.

P3 (I/C)

For a sub-link of a serial link, specify the node address of the sub-link. For a sub-link of an Ethernet link, specify the sub-link ID of the sub-link. If the specified communication link has no sub-link, this parameter is ignored.

Example 1

$U100 = LINK_STS(2, 0) /* Get the status of communication link 2 and save it to $U100. */

Example 2

$U12 = LINK_STS(1, 128) /* Get the status of the sub-link, whose node address is 128, of communication link 1 and save it to $U12. */

■ LINK_PAR

Format

LINK_PAR(P1,P2,P3,P4)

Data Type

Function

Accesses the communication parameters of an Ethernet link or a sub-link of an Ethernet link.

P1 (I/C)

The operation of the access.

Operation	Value
Get parameters	0
Set parameters	1

P2 (I/C)

The number of the communication link. For example, the number of the first link is 1. Note that the link must be an Ethernet link or the operation will fail.

P3 (I/C)

The ID of the sub-link. If the specified communication link has no sub-link, this parameter is ignored.

P4 (I)

The starting location of the memory block that stores the parameters. The memory arrangement of the block is shown in the following table.

Word No.	Description
0	The communication delay. The unit is 1 millisecond.
1	The timeout time. The unit is 0.1 second.
2,3	The IP address. The four bytes of this double-word stores the 4 numbers of an IP address.
	Byte		Content
	High byte of word No. 3		The 1st number
	Low byte of word No. 3		The 2nd number
	High byte of word No. 2		The 3rd number
	Low byte of word No. 2		The 4th number
	[Example] The following table shows how the IP address '192.168.1.100' is stored in the memory block when the memory block starts at $U100.
	Byte	Content		Remark
	HIgh byte of $U103	C0H (192)		The word value of $U103 is C0A8H
	Low byte of $U103	A8H (168)
	High byte of $U102	01H (1)		The word value of $U102 is 0164H
	Low byte of $U102	64H (100)
	[Note] You can use a numeric entry object to display and enter an IP address. When configuring a numeric entry object to display an IP address, Select '32-Bit Unsigned Integer' as the Data Type and select 'IP Address' as the Display Type.
4	The IP port number.
5	Reserved
6	Reserved
7	Reserved

Example 1

LINK_PAR(0, 1, 2, $U100) /* Get the communication parameters of sub-link 2 of communication link 1 and save it to the memory block starting at $U100. */

Example 2

$U200 = 10 (U) /* Will be used to set the command delay to 10 ms */
$U201 = 1 (U) /* Will be used to set the timeout time to 0.1 second */
$U202 = C0A80164H (UD) /* Will be used to set the IP address to 192.168.1.100 */
$U204 = 2000 (U) /* Will be used to set the IP port to 2000 */
LINK_PAR(1, 2, 0, $U200) /* Set the communication parameters of link 2 using the data stored in the memory block starting at $U200. */