55 Chapter3
Digital Input/Output
The EKI-7657C contains two digital inputs and two digital outputs. The digital inputs may be used to
receive the voltage-changing signal of the remote equipment to sense the state of the remote equipment
like heater, pump, and other electrical equipment. Therefore the switch can be configured to send system
log, SMTP and SNMP traps to syslog server, SMTP server and SNMP trap station respectively (please
refer to System Event Log and SNMP configuration section). Outputs are open-collector transistor
switches used to connect to the external device like alarm buzzer or LED to inform the user of the
port/power status.
Digital Input
• When First/Second Digital Input function is enabled, their Digital Input, Event Description and
Action setting items will then be available respectively.
• Digital Input: Choose the transition type to trigger DI0/DI1.
¾ LowÆHigh: Having focused this radio button, DI0/DI1 will only report the status when the
external device’s voltage changes from low to high.
¾ HighÆLow: Having focused this radio button, DI0/DI1 will only report the status when the
external device’s voltage changes from high to low.
• Event description: Please fill in the description for the event.
• Action: Tick the check boxes to decide whether or not to send the events via Syslog, SMTP, or SNMP
Trap.
Digital Output
• When First/Second Digital Output function is enabled, their Condition and Action setting items will
then be available respectively.
• Condition: The system will send an electrical Low-to-High or High-to-Low signal to First Digital Output
(DO0)/Second Digital Output (DO1) when the condition of ticked checkbox is met.
¾ Port Fail: Having ticked this checkbox, DO0/DO1 will output an electrical Low-to-High or High-
to-Low signal when port failure occurs.
¾ Power Fail: Having ticked this checkbox, DO0/DO1 will output an electrical Low-to-High or
High-to-Low signal when power failure occurs.
• Action: Choose the output type of electrical signal.
¾ LowÆHigh: Having focused this radio button, DO0/DO1 will output an electrical signal of Low-
to-High when the condition of the ticked checkbox is met (port/power failure occurs).
¾ HighÆLow: Having focused this radio button, DO0/DO1 will output an electrical signal of Low-
to-High when the condition of the ticked checkbox is met (port/power failure occurs).
Note Besides ticking the checkboxes in the Condition column field, the power/port failure
checkboxes of Fault Relay Alarm have to be ticked as the precondition. Please refer to
Fault Relay Alarm section. Also, please notice that the digital output can’t connect to
the external device using power higher than 40V/200mA.