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12 | Section 2 try connecting pin 3 of the Hx input to ground, or even “floating” the ground and using only the high and low pins on the Hx. It’s also important that unbalanced lines be kept short to avoid hum and noise pickup. You’ll probably need to adjust the input gain on the Hx to match the output of your device. We also suggest that all of your audio equipment be powered from the same AC power source or circuit to prevent ground loops due to the use of multiple grounds.
For complete information and suggested wiring and grounding techniques for your studio or recording workstation, please visit the support page at the Telos website: http://www.telos systems.com/support.
2.5 Output Audio Connection
The output connection, RCV OUT, has the following characteristics:
♦
XLR Pin 1 = Ground,
♦
XLR Pin 2 = High (Active Balanced, RF suppressed)
♦
XLR Pin 3 = Low (Active Balanced, RF suppressed)
♦
Output impedance, < 60 Ohms
♦
Analog clip point at +24 dBu
♦
Digital-to-Analog converter resolution of 24 bits
The nominal output level is fixed at +4 dBu, with +20 dBu headroom to account for the crest factor of some audio signals.
If you are connecting the output of your Hx to a device with an unbalanced input, connect the shield from your device’s unbalanced input to pin 1 (ground) on the Hx, and the “hot” lead from your device to pin 2. It’s important that unbalanced lines be kept short to avoid hum and noise pickup. We also suggest that all of your audio equipment be powered from the same AC power source or circuit to prevent ground loops due to the use of multiple grounds. For complete information on suggested wiring and grounding techniques for your studio or recording workstation, please visit the support page at the Telos website: http://www.telos-systems.com/support.
2.6 Remote Control
The female DB9 connector on the Back Panel provides access to control functions. Pin 1 of the
DB9 connector is Ground. Pins 2 through 5 on the top row are for GPIO input signals from the remote device, while Pins 6 through 9 on the bottom row are GPIO output signals to the remote device. Two of the GPIO input pins and two of the GPIO output pins are reserved for each hybrid as follows:
Pwr 5vdc
Hx Remote
Connector
General internal Schematic of Hx
Remote Control port
10k
D
L
1 6
L
EXAMPLE
INTERFACE
OPTION
GROUND
C
5
9
GROUND
Inputs 2-5 Outputs 6-9**
** Please review manual for current limitations per GPIO outputs
5
9
Control Port
6
1
Value = As Needed
R (optional)
Ext PSU’s
GROUND
D
imax = 400 mA**
Ext PSU. +5 to 24 VDC
5 - 24 VDC Relay
Aromat or Omron Dip
Relay works good
Use to control a light/strobe/etc.
Contact Closure Out
A typical wiring example for an external ringing indicator
Use an external PSU and tie the ground of PSU to pin 1 of HX’s
Remote Port
** Please review manual for current limitations per
GPIO outputs
Hx Remote
Connector
Pwr 5vdc
10k
Hx Remote
Connector
D
L
1 6
L
Pwr 5vdc
Remote Control port
10k
D
L
1 6
General internal Schematic of Hx
Remote Control port
L
GROUND
C
Inputs 2-5
5
9
GROUND
Outputs 6-9**
C
GROUND
Inputs 2-5
5
9
Outputs 6-9**
GROUND
INSTALLATION | 13
EXAMPLE
INTERFACE
OPTION
Control Port
EXAMPLE
INTERFACE
OPTION
Ext PSU. +5 to 24 VDC
Control Port
5
1
Ext PSU. +5 to 24 VDC
5
1
9 6
R (optional)
Ext PSU’s
GROUND
Value = As Needed
D
imax = 400 mA**
9 6
Ext PSU’s
GROUND
Aromat or Omron Dip
Relay works good
D
Value = As Needed
R (optional)
imax = 400 mA**
Use to control a light/strobe/etc.
Contact Closure Out
Pin No.
1 GPIO
Function
Ground
2 GPIO IN Hybrid #1 - Hybrid ON
3 GPIO IN Hybrid #1 - Hybrid OFF
4 GPIO IN Hybrid #2 - Hybrid ON
5 GPIO IN Hybrid #2 - Hybrid OFF
6 GPIO OUT Hybrid #1 - ringing indicator
7 GPIO OUT Hybrid #1 - ON/OFF status indicator
8 GPIO OUT Hybrid #2 - ringing indicator
** Please review manual for current limitations per
GPIO outputs
A typical wiring example for an external ringing indicator
Use an external PSU and tie the ground of PSU to pin 1 of HX’s
Remote Port
** Please review manual for current limitations per
GPIO outputs
Input Characteristics
♦
The GPIO inputs are designed to be universal. They accept either a voltage source up to 24VDC, or a closure to ground, which may be provided by switches, relays, or logic outputs. In the latter case either ‘totem-pole’ or open-collector will work. The inputs are active low.
♦
A built-in 10k Ohm pull up resistor is provided.
Output Characteristics
♦
Open-collector to ground.
♦
These will require a pull-up resistor to drive TTL-style logic inputs. Most equipment has the pull-up built into the input, but if there is no pull-up, you’ll have to add one, connecting it from the output pin to a +5V source. An appropriate value is 2.2K Ohms. The diagram above provides a sample circuit.
♦
Sink (pull-down) current must be limited to 400mA maximum per output with total output restricted to 1 amp (250 mA each output if all four will be used).
The GPIO output pins can be used to provide status information to other devices or warning lamps. Outputs are available to indicate “hybrid in use” and “line ringing”.
5 - 24 VDC Relay
Aromat or Omron Dip
Relay works good
Use to control a light/strobe/etc.
Contact Closure Out
A typical wiring example for an external ringing indicator
Use an external PSU and tie the ground of PSU to pin 1 of HX’s
Remote Port
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