Perle Systems Iolan Sds4 Hl Device Server 4030370 User Manual

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Channels

When the channel is set for digital output, either voltage is applied to the channel or the channel is 
grounded. Note that the internal jumpers must match the software setting and must be set to Output 
(by default, they are set to Input); see 

to find out how to set the internal jumpers.

The Digital output channels support three types of Digital output: sink (voltage), source (ground), and 
sink and source (apply voltage or ground). For the output type, you can configure the following 
options:

z

You can choose to manually activate/deactivate the Digital output.

z

You can choose to manually activate/deactivate the Digital output and then specify that the 
Digital output will either pulse (you get to specify the active and inactive pulse times) 
continuously or for a specified number of pulse counts.

z

You can choose to manually activate/deactivate the Digital output and then specify a delay 
before the output goes from inactive to active or active to inactive.

z

You can also specify a failsafe action that can either activate or inactivate the Digital output 
when the failsafe timer is triggered (see 

for more information). 

In an industrial freezer warehouse, the IOLAN D4 is used to monitor the freezer doors. When one of 
the industrial freezer doors are left open for more than five minutes, the Monitoring Application 
(using the Perle API) starts the Digital output sink, causing the strobe light on top of the offending 
freezer to activate. 

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