Справочник Пользователя для Perle Systems 5500161-40

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Channels

The 

 section displays the I/O Channels window, through which you can enable/disable the 

I/O channels.

Highlight a channel and then click the 

 button to configure the parameters for that channel.

Analog channels monitor current/voltage input. Note that the internal jumpers must match the 
software setting (by default, they are set to Current); see 

 to find 

out how to set the internal jumpers.

For example, in an industrial freezer warehouse, the IOLAN A4R2 is used to monitor humidity 
transducers, which are in place to help prevent freezer burn. If the humidity reaches a certain 
percentage (monitored by an Analog channel) a syslog message is sent to the Monitoring Application. 
The Monitoring Application then sends a command to the IOLAN via the Perle API that causes the 
Relay channel to activate an internal freezer dehumidifier. The relay is turned off when the Analog 
channel sends a clear syslog message to the Monitoring Application and the Relay channel is 
deactivated.

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