LA Audio ZX-GPI Assembly instructions

ZX-GPI
Installer's Guide
Release 1
January 2003

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1. INTRODUCTION
The ZX-GPI module allows all of the functions of a ZX-R2, Remote Controller i.e.
Source select, Mute and Volume changes, to be remotely controlled via external
switches and/or control voltages.
The nine GPI inputs can be individually selected between switch or voltage
modes and the power for switch mode can be selected to be internal (via Network
Power) or from an external, isolated supply.
Figure 1.1: General views of the ZX-GPI
On the Network the ZX-GPI is seen as a ZX-R2 Remote Controller so also
requires a unique Channel ID and Sub ID. The Sub ID allows up to three ZX-GPI
and/or ZX-R1 or remote controllers R2 to control the same Channel.
Figure 1.2 shows a block diagram of the ZX-GPI.
2. ZX-GPI COMMAND MESSAGES
• Source select 1 to 6
• Mute
• Volume +
• Volume -

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Figure 1.2: ZX-GPI Block diagram.
3. CONNECTING THE ZX-GPI
The ZX-GPI is connected to the Network using CAT 5, Ethernet cables fitted with
RJ45 connectors, wired pin to pin. Two RJ45 sockets are provided on the ZX-GPI
to allow easy daisy chaining.
Cat 5 cables for use with the ZX-GPI network must conform to the T568a
standard with a twisted pair of wires connected to pins 4 and 5.
When making up cable assemblies ensure that the cable has at least one
twisted pair of wires which must be connected to pins 4 and 5.
The cable should be wired pin 1 to pin 1, pin 2 to pin 2 etc. Network pin
assignment is as follows -
1 Network Power +
2 Network Power +
3 Network Busy
4 RS 485 +
5 RS 485 -
6 Signal and Power ground
7 Signal and power ground
8 Signal and power ground
Please note:
Network Power is intended for ZX peripherals including the MR1, R1 and R2
Remotes, the HUB and RS232 interface.

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4. POWERING THE ZX-GPI
The ZX-GPI can be powered in one of two ways -
1. Self powered through the Network.
2. An external DC adapter connected to the NETWORK POWER jack.
This may be necessary if the ZX-GPI is sited a long distance from the
ZX135 or there are a large number of peripherals on the Network. See
Section 7 and 8 for further details.
The DC jack, marked 'POWER EXT' is used in Switch Mode when external power
source is selected - see Sections 5-3 and 5-4. This allows the external control
circuitry to use different voltages and/or separate grounding to the Network.
If any of the external control switches are referenced to ground then it will
be necessary to use an external power supply and select external power.
5. CONFIGURING THE ZX-GPI
The ZX-GPI is configured using the links and switches shown in Figure 5.1.
Figure 5.1: Internal view of the GPI showing configuration links and switches.
5-1. Channel select switches
Referring to Figure 5.1 and 5.2, the Channel Select switch (SW2) is an 8 way DIP
switch -
Switch 1 - 5 Channel ID number
Switch 6 & 7 Sub ID number
Switch 8 Reserved - should be left in the OFF position.
The switches are binary weighted, Figure 5.2 shows some examples of setting
the Channel and SUB ID numbers.

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Figure 5.2: Examples of setting SW2, Channel Select switches.
For other Channel numbers refer to the following table -
Switch 1 2 3 4 5
Value 1 2 4 8 16
Channel ID
0 Reserved
1 ON - - - -
2 - ON - - -
3 ON ON - - -
10 - ON - ON -
23 ON ON ON - ON
i.e. Channel 5 is selected using switch 3 (value 4) and switch 1 (value 1). The
binary values are added together to give the Channel (or SUB) ID number.
Please note:
Channel ID '0' i.e. all switches in the OFF position, is reserved.
For a stereo output the Channel ID can be set to correspond to either of the
Output channels.
SUB ID:
The Network allows up to three ZX-GPI modules (or a combination of ZX-GPIs
and ZX-R1 or ZX-R2 Remotes) to have the same Channel ID i.e. a Channel can
be adjusted from one or more controllers. However in order to prevent system
conflicts each ZX-GPI (or ZX-R1/R2) sharing the same Channel ID must have a
unique Sub ID. This Sub is set using switches 6 & 7 -
Switch 6 7
Value 1 2
Sub ID
0 Reserved for ZX-MR1 Master Controller
1 ON -
2 - ON
3 ON ON
So in the two examples shown in Figure 5.2 with Channel 5 selected, two ZX-GPI
(ZX-R1 or ZX-R2 Remote controller) can control Channel 5.
Please note:
Sub ID '0' i.e. both switches in the OFF position, is reserved for the ZX-MR1
Master Controller, so cannot be used for the ZX-GPI.
Mute and Volume Groups:

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If Mute & Volume Groups have been set up as defined in the ZX135 Installation
Manual, Section 3.5, a single ZX-GPI may be used to control the volume of all
outputs in the Group. It only needs to be assigned to any output channel in the
group.
Please refer to the ZX135 Installation Manual for more details of setting up Mute
and Volume Groups.
5-2. Input Polarity select switches
Referring to Figure 5.1, the Input Polarity switch (SW3) is an 8 way DIP switch -
Switch 1 -6 Source select 1 - 6
Switch 7 Volume adjust
Switch 8 Mute
Please note:
The polarity setting for both Volume up and down is the same.
With these switches in the OFF position an external control voltage or closed
contact will cause a source select, volume change or mute.
The polarity of each GPI can be reversed individually using these switches i.e.
the external voltage goes off or contacts open to cause a source select, volume
change or mute.
Application example:
A single switch (or voltage) can be used to change inputs on the ZX135. Link two
of the Source change inputs on the ZX-GPI, e.g. GPI 1 and GPI 3, and reverse
the polarity on one of these. Now when the control switch or voltage is operated
the source on the ZX135 is changed between Input 1 and 3.
5-3. Switch - Voltage select links
Each of the six inputs can be independently configured for switch or voltage
control modes -
Switch mode:
In Switch mode an external pair of normally open or normally closed
(depending on the setting of the Input Polarity switches) switch contacts
is used to operate the GPI inputs.
The control contacts are connected between pins 1 and 2 of the GPI
connector.
Power for the external switch contacts can either be supplied by the ZX-
GPI or an external source, depending on the setting of the Internal -
External power select switch - see Section 5-4.
Please note:
Pin 1 of the GPI is connected to the common side of the internal -
external switch supply and that all Pin 1s are joined together.

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Figure 5.3: Link position and schematic for Switch mode.
Voltage mode:
In Voltage mode an external normally ON or normally OFF (depending on
the setting of the Input Polarity switch) voltage is used to operate the GPI
inputs.
The external control voltage is connected between pins 2 and 3 and must
be in the range 5V to 30V - see Section 8.0. Polarity is not important as
each GPI input includes a bridge rectifier - see Figure 5.4.
Figure 5.4: Link position and schematic for Voltage mode.
Please note:
In Voltage mode there is no common input pin as there was for Switch
mode. Therefore if a common connection for the inputs is required this
must be wired externally i.e. linking all pin 2 or 3 on the Phoenix plugs.
5-4. Internal - External power switch:
This switch selects between Internal and External power source for all GPI inputs
used in Switch mode - see Figure 5.3.

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Internal:
Power for the external switches is supplied by the ZX-GPI via a 1k0 resistor.
External:
Power for the external switches is supplied by the power supply connected to the
POWER EXT socket. Each switch feed has a series 1k0 resistor -see figure 5.3.
Please note:
External power must be used when any of the external control switches are
referenced to Ground.
5-5. Ground lift:
The ZX-GPI is supplied with the metal case connected to Network ground - pins
6, 7 & 8 of the RJ45 connector. Therefore in some situations such as attaching
the case of the ZX-GPI to audio equipment racks, interference between Audio
and Digital grounds may occur. Moving the ground link to position B provides a
ground lift - see Figure 5.5.
Figure 5.5: Grounding link - shown in default, grounded case position.
5-6. SRC1-6, VOL and MUTE:
These leds, SRC1 - 6, VOL and MUTE, light whenever a GPI is active.
6. PROGRAMMING THE ZX-GPO
Providing the Channel and Sub ID have been set correctly - see Section 5-1
(Channel select switches), the Network automatically senses the ZX-GPI and no
further programming is required.
7. NETWORK INSTALLATION CABLE LENGTHS
Typical installation cable lengths for the Network are shown in the following
tables. These distances result in a minimum voltage on the network of 5.5V,
required for correct operation.
Although not shown the ZX-GPI draws a similar amount of current to the ZX-MR1
(Master controller).

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Issue 1: Serial No: ZX135 0101 to 0200
Configuration Distance (m)
1 MR1 + 2 Rx 40
1 MR1 + 1 Rx 50
1 MR1 80
3 Rx 150
3 Rx 170
2 Rx 180
Issue 2: Serial ZX135 0201 and above
Configuration Distance (m)
1 MR1 180
1 MR1 + 2 Rx 180
1 MR1 + 1 Rx 180
1 MR1 + 3 Rx 180
1 MR1 + 1 PM1 180
1 MR1 + 1 Rx + 1 PM1 160
1 MR1 + 4 Rx + 1 PM1 100
1 PM1 180
1 PM1 + 1 to 4 Rx 180
2 PM1 + 1 to 3 Rx 180
2 PM1 + 4 Rx 160
5 Rx 180
Where MR1 is the ZX-MR1 Master Controller, Rx is either the ZX-R1 or ZX-R2
Remote controller and PM1 is the ZX-PM1 Paging Microphone.
8. DC POWER SUPPLY
Network Power:
Power supplies, suitable for use with the ZX135 Network can included plug top or
cable mounted types and should be rated at -
9V to 12V DC, unregulated, 0.5A to 1A (depending on number of peripheral
devices).
DO NOT EXCEED 12V DC FOR NETWORK POWER AS THIS WILL CAUSE
THE ZX-GPI AND OTHER PERIPHERALS TO OVERHEAT.
Power Ext:
This connector is used to supply power to the external contacts in Switch mode
and is electrically separate from Network Power and ground.
Suitable supplies include plug top or cable mounted types typically rated at 9-12V
DC, 100mA, unregulated.