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8
I/O Sentinel 4 G2 Installation and Operation Manual
OPERATION
Input Jumper Configuration
Each input is equipped with an internal four-position header and two jumpers. The
headers are labeled JPR1-4, JPR1 = IN1, JPR2 = IN2, etc. The factory default con-
figuration is for a DRY input (relay contact, switch, open collector) with a jumper
over pins 1 & 2 and another jumper over pins 3 & 4. To change the input to WET
(user supplied external voltage between 5 and 24 VDC, or 25-48 VDC with an added
resistor), remove both jumpers and place ONE jumper over pins 2 & 3.
Operation
The I/O Sentinel 4 G2 can be controlled from over the network from its HTML-
based web-browser interface, via SNMP, or via TCP commands. The slow blinking
front panel “PWR/Heartbeat” LED indicates valid power and proper operation. The
front panel Input and Output LEDs indicate channel status.
Reset to Defaults
Factory defaults may be restored by depressing the recessed front panel “Defaults”
push button for five seconds after waiting for the unit to power up. The PWR/HB
led will rapidly blink two to three times when loaded.
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