Sutron Corporation Satlink Operations & Maintenance Manual, Rev 8.04.2 11/3/2016 pg. 117
Satlink can automatically operate the outputs based on alarm conditions. The output control
setting determines what Satlink will do.
Manual
The output is not operated on alarm. It can be operated via
equations or command line.
Alarm in only
The output is turned on when SL3 has a measurement that goes into
alarm. The output remains on until it is turned off manually.
Alarm in and out
The output is turned on when SL3 has a measurement that goes into
alarm. The output is turned off when the measurement goes out of
alarm.
Warning: controlling an output via alarms and also by equations or command line can have
unpredictable results.
The digital outputs are DOUT#1 (Output1) and DOUT#2 (Output2). The digital output is an open
collector type output. This provides direct interface to many products. The open collector output
sinks 100mA (rated at >400mA) on a continuous basis.
It is expected that a pull-up resistor will be connected to the Prot+12V or other supply. The value
of the pull-up may be determined by the impedance of the connected load. A10 kOhm resistor
may be used as a default.
With a pull-up
resistor connected
When the output is
turned on
, the output sinks current from all attached devices.
When the output is
turned off
, the output is pulled up to the supplying voltage.
11.3.1.
Programmable Voltage References
The built-in excitation reference voltage in SL3-1 is 2.5 volts available on pins 26 and 30. SL3-1
also supports a programmable excitation reference voltage via an optional plug in card. This may
be used in place of the 2.5VREF when you need a different excitation voltage for a sensor.
The optional card (Sutron part 6461-1328) can be plugged into either Option port 1 or 2. Note:
You must issue the command OPTION PORT 1 = PREF (or OPTION PORT 2 = PREF) when you first
install the PREF card in SL3. The card provides two outputs labeled PREF1 and PREF2. The
output voltage turns on whenever SL3 turns on VREF.
The outputs have a range of 0 to 5VDC. The desired output is set via the menu on the options
tab:
The PREF board has the following terminals:
