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Publication 2706-UM016A-EN-P - June 2002
InView Control InView Control API
10-7
Heartbeat
•
Syntax
-
object
.
Heartbeat
=
value
Read/Write [short]
•
Values -
0 - No heartbeat from control
1 - Heartbeat generated by control
2 - Heartbeat disabled
•
Default -
0
•
Description
- This property is used to set how the control will
handle the heartbeat requirement of the display. The display
requires serial activity approximately every 3 seconds. In the
absence of such activity the display will show a “No Network
Activity” message. If the heartbeat property is set to 0, the
activity is assumed to come from sources such as variable
updates. If the heartbeat property is set to 1, the control will
generate a serial “heartbeat” command that prevents the display
from displaying the no activity message. If the heartbeat
property is set to 2, the need for constant serial activity will be
disabled in the display.
Methods
Initialize
•
Syntax
- HRESULT
Initialize
()
•
Parameters
- None
•
Return Value
-S_OK - Success
E_FAIL - Failure
•
Description
- This method is used to open the COM port or
socket that will be used to communicate with the display. If
Initialize
is called more than once, any open connection will be
closed, and a new connection opened.
Close
•
Syntax
- HRESULT
Close
()
•
Parameters
- None
•
Return Value
-S_OK - Success
E_FAIL - Failure
•
Description
- This method is used to close any open
connection to free its resources for other applications. Any open
connection is automatically closed when the control is
unloaded.
Содержание InView Marquee 2706-P42
Страница 6: ...Publication 2706 UM016A EN P June 2002 Table of Contents iv...
Страница 32: ...Publication 2706 UM016A EN P June 2002 1 26 InView Marquee Message Display Installation...
Страница 36: ...Publication 2706 UM016A EN P June 2002 2 4 InView System Connectivity...
Страница 61: ...Publication 2706 UM016 A EN P June 2002 DF1 Point to Point Communication 4 19 Allen Bradley Spares...
Страница 62: ...Publication 2706 UM016 A EN P June 2002 4 20 DF1 Point to Point Communication...
Страница 87: ...Publication 2706 UM016A EN P June 2002 EtherNet IP Communications with Dual ENI 5 25 Allen Bradley Spares...
Страница 88: ...Publication 2706 UM016A EN P June 2002 5 26 EtherNet IP Communications with Dual ENI...
Страница 103: ...Publication 2706 UM016A EN P June 2002 EtherNet IP Communications 6 15 Allen Bradley Spares...
Страница 104: ...Publication 2706 UM016A EN P June 2002 6 16 EtherNet IP Communications...
Страница 127: ...Publication 2706 UM016A EN P June 2002 DeviceNet Communications with Dual DNI 7 23 Allen Bradley Spares...
Страница 128: ...Publication 2706 UM016A EN P June 2002 7 24 DeviceNet Communications with Dual DNI...
Страница 136: ...Publication 2706 UM016A EN P June 2002 8 8 DeviceNet Communications...
Страница 204: ...Publication 2706 UM016A EN P June 2002 A 2 Technical Specifications...
Страница 206: ...Publication 2706 UM016A EN P June 2002 B 2 Temperature Protection in NEMA Rated Enclosures...
Страница 208: ...Publication 2706 UM016A EN P June 2002 C 2 Catalog Number Explanation...
Страница 211: ...Allen Bradley Spares...