Symetrix SymNet Series - Analog and Output Connections; Analog Input;Output Details; Binary, Relay, and RS485 Outputs

To download the latest version of SymNet designer, the Windows application that
controls SymNet hardware go to www.symetrixaudio.com/Products/symnet.htm.
Quick Start
SymNet
™
Revision A.04
To download the latest version of SymNet designer, the Windows application that
controls SymNet hardware go to www.symetrixaudio.com/Products/symnet.htm.
Quick Start
SymNet
™
Revision A.04
Hardware Installation ... continued
6 of 9
Analog Input / Output Connections
Item Description Details Remarks
Analog
Inputs
Balanced-bridging input
accepts signal levels from
mic (-50dBu nominal)
through line (+4dBu
nominal). 48V phantom
power available.There is
20 dB headroom past the
signal level selected. At
unity gain (+4dBu setting),
the maximum input level is
+24dBu.
Input impedance:
>6.66k balanced, >3.3k
unbalanced. The input
topology uses a balanced
instrumentation amplier.
Both inputs are identical
and symmetrical in terms
of impedance and shunt
capacitance. Set input
level capability, phantom
power, and gain via control
software.
For unbalanced use, either reference the
minus input terminal to the signal source
ground (preferred) or ground the minus input
to the adjacent ground terminal. Using the
second method deprives you of the common
mode rejection inherent in a balanced input,
even when coming from an unbalanced
source.
Analog
Outputs
Balanced line output
delivers +24dBu maximum
level. Nominal level can
be software adjusted for
professional or consumer
line levels or mic level.
Output source impedance:
204-ohms balanced, 102-
ohms unbalanced.The
output topology is a chain
of inverters, emulating
a grounded center-tap
transformer secondary.
For unbalanced use oat (do not connect) the
minus output terminal. Note that unbalanced
usage results in 6dB lower output level.
Analog
Control
Inputs
High-impedance input
accepts 0-10V positive
DC signals.10V reference
voltage available at rear
panel interface.
Use with external
potentiometer (10k linear
taper) or external voltage
source (0-10V). See Rear
Panel for connections.
Binary, Relay and RS485 Outputs
Item Discussion Remarks
Binary Outputs Six NPN transistor outputs, cleverly
wired to allow operation as open
collector output for relay coil driving
or for sourcing LED drive current.
Collector and ground connections
furnished.
These outputs can also drive an LED
directly. Current limit resistor not
needed.
2N4401 transistors. Current must be
< 50mA, 24V maximum.
Control software determines how
these are used.
If you’re driving a relay, be sure to
include a reversed biased diode
connected across the relay coil.
Connect the LED from the output to
ground.
Relay Outputs Three SPDT relay contacts.
Contact rating: 3A, 24VDC,
resistive0.3A, 60VDC, resistive
SymNet Designer determines how
these are used.
Do not use at 120VAC.
RS-485 I/O Connect to RS-485 system. 2-signal lines and ground provided.
See SymNet Designer Help Module
or www.symetrixaudio.com for
complete protocol.