User manual

Chapter Three Operation
Page 49 March 2010
3.14 Digital Input/Output and I/O Transfer
In firmware versions v1.28 and earlier, the menu item was named Digital Input/Output. In later
versions it was renamed I/O Transfer, due to enhanced functionality where units can send the
status of the Digital Input to another module or ModBus device.
The shared Digital Input/Output pin may be monitored and set via the internal webpage. As this
pin is shared, the Digital Input status will be ON when the Digital Output is set ON.
The Digital I/O channel can also be configured to provide a status output of the module
communications. If the WI-MOD-9-E disassociates from another unit (that is, there is no
wireless link), you can configure the digital output to turn ON (set) or OFF (drop).
The configurable Digital I/O status and alarm options are summarized below.
Shared Digital I/O Status The Digital I/O is a shared pin on the unit. As an output, it is similar to
an open collector transistor. As an input, a short to ground is detected as
ON. When the Digital Output is driven low, the Digital Input will detect
an ON condition. By clicking on the button provided, the Digital Output
may be switched ON and OFF, provided Communications Failure has
previously been set to no action.
Digital Output on
Communications Failure
The digital output can be configured here to perform various actions
when a link is present. Select Set Output to drive the open collector
output when there is no radio link. Select Drop Output to drive the open
collector output when a radio link is present.