9
SymNet Express Cobra Family
Binary Outputs • Analog Control Inputs
Binary (Open Collector) Outputs
The following illustrations depict three typical open collector
output hook ups. The most common uses for the open
collector outputs are to fire external LED indicators (LED
lit when O/C inactive) or drive external relays. (Please see
the SymNet Designer online help for information on how to
address an Open Collector output in a SymNet DSP design.)
Analog Control Inputs
The following illustrations show the connection of either a
10k Ohm linear potentiometer, a mechanical rotary encoder
or switches to one of the 2 analog control inputs of the
Express. (Please see the SymNet Designer online help for
information on how to assign an analog control input to a
SymNet DSP parameter. Note: The Express’s Control In
ports must be set to Pot, Switch or Encoder modes in the
I/O Options of the device Properties dialog. See SymNet
Designer online help for more information.)
The Symetrix model RC-3 is the perfect potentiometer
match for the Express. Suitable potentiometers, switches
and encoders might also be sourced from electronic parts
suppliers such as Digi-key. Note that encoders must be of
the mechanical type.
Disclaimer:
From time to time we test the compatibility of
our own products with those of third parties. While we are
happy to share with our customers the results of our own
studies as well as other possibly unsubstantiated information
regarding these third party products, it is the policy of
Symetrix, Inc. to neither endorse, recommend nor support
products manufactured and/or supplied by third parties.
The responsibility of choosing third party products which
are compatible with Symetrix products rests solely with the
qualified contractor, consultant or system designer.
1. Self-Sourcing
LED Drive
Internal External
Note:
You do not need
to supply the
components on the
"Internal" side. These
components are internal
to the DSP and
only illustrated here for
the purpose of under-
standing the operation
of the circuit.
Open Collector
Output
to OC output
LED
GND
+5 VDC
0V
220 Ohm
33 Ohm
PZTA06
1N4003
1N914
1N914
2. External Relay Drive
to OC output
Relay
External Relay Supply
(24 VDC Max)
50 mA Max
coil current
1N4004
+V from
external
supply
3. External LED drive using
external supply for
more current
to OC output
LED
Euroblock
2C Shielded Twisted Pair
10kohm
Linear
Taper
Pot
+V
IN
GND
Typical Control Potentiometer Wiring
Euroblock
Switch 1
+V
IN
GND
Typical Control Switch Wiring
for Discrete Switch Inputs
Switch 2
Euroblock
A or +ve
B or -ve
GND
+V
IN
GND
Typical Mechanical Rotary Encoder Wiring
Summary of Contents for ExpressCobra Series
Page 19: ...19 SymNet Express Cobra Family...
