Device Communications Wizard - I/O Device Connection Schedule
- Last UpdatedJul 18, 2023
- 3 minute read
The Device Communications Wizard allows you to define the details of the communications schedule for your I/O device and indicate that your I/O device is remote by checking the PSTN box.
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Options |
Description |
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Connect I/O Device to PSTN |
Check this box to indicate that the I/O device is a dial-up I/O device (connected to a PSTN - Public Switched Telephone Network). Note: Even if your I/O device is not connected via a modem, you need to still check this box to schedule communications (but leave the Phone number to dial and Caller ID fields blank). Once you have completed your I/O device setup using this Wizard, you need to go to the Ports form and change the Port number to the actual number of the COM port. You can choose to define the communication period in terms of months, weeks, days, or hours, minutes, and seconds. Alternatively, you can choose to communicate only at startup (persistent connection). Click a radio button to make your selection, then enter the start time and period as described below. |
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Synchronize at |
The I/O Server will attempt to communicate with the I/O device at this time, and then at intervals as defined below. This time is merely a marker for Plant SCADA. If you run up your project after this time, the I/O Server won't wait until the next day to begin communicating. It will operate as if your project had been running since before the start time. |
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Repeat Every |
The time between successive communication attempts. (See Examples below.) |
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Phone number to dial |
The telephone number that needs to be dialed to initiate contact with the I/O device. |
Note: These values can also be set using the I/O devices view in the Topology activity.
Examples
Examples are based on a Synchronize at time of 10:00:00:
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If you enter 12:00:00 in the Repeat every field, and start your project at 9 a.m., the I/O Server will communicate with the I/O device at 10 a.m., then once every 12 hours after that, i.e. 10 p.m., then again at 10 a.m. of the following day, etc.
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If you enter 12:00:00 in the Repeat every field, and start your project at 4 p.m., the I/O Server will communicate with the I/O Server at 10 p.m., then again at 10 a.m. of the following day, etc. It will assume that communications were established at 10 a.m., so it continue as if they had been - communicating once every 12 hours after 10 a.m.
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If you enter 3 days in the Repeat Every, and start your project at 9 a.m. on a Wednesday, the I/O Server will communicate with the I/O device at 10 a.m., then once every 3 days after that, i.e. 10 a.m. on the following Saturday, then at 10 a.m. on the following Tuesday, etc.
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If you enter the 6th of December in the Repeat every, and start your project during November, the I/O Server will communicate with the I/O device at 10 a.m. on December 6, then again on December 6 of the following year, etc.
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Select On Startup for a persistent connection. To disconnect a persistent connection, you need to call the IODeviceControl() function with type 8.