Studio Technologies 234 Bedienungsanleitung

www.studio-tech.com

User Guide

Issue Preliminary 1, June 2020

This User Guide is applicable for serial numbers

M234-00151 and later with main firmware version 1.01 and later

and STcontroller application version 2.10.00 and later.

50686-0620 Issue Preliminary 1

Model 234 Announcer’s Console

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Table of Contents

Revision History ............................................................................. 4

Introduction .......................................................................... Pending

Getting Started ................................................................................ 5

Dante Configuration ......................................................................... 8

Model 348 Configuration ................................................................ 10

Operation ............................................................................. Pending

Technical Notes .............................................................................. 19

Specifications ................................................................................. 24

Appendix A: STcontroller default configuration values ................... 26

Appendix B: 3-Pin Header Connector Details ................................ 27

Appendix C: Model 234 Block Diagram .......................................... 28

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MODEL 234

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Revision History

Issue Preliminary 1, June 2020:

• Initial preliminary release.

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Introduction

– Pending –

Getting Started

What’s Included

Included in the shipping carton are a Model

234 Announcer’s Console and a printed copy

of this guide. As a device that can be Power-

over-Ethernet (PoE) powered, no external

power source is provided. This is because in

most applications an Ethernet switch with PoE

capability will be utilized. It’s also possible to

connect an external source of 12 volts DC to

power the Model 234. If this is the case then

a power supply would need to be provided

separately.

Connections

In this section signal interconnections will be

made using the connectors located on the

back of the Model 234’s enclosure. One or

two Ethernet connections will be made using

either standard RJ45 patch cables or ether-

CON protected RJ45 plugs. The Ethernet

data connection associated with the primary

RJ45 connector is compatible with Power-

over-Ethernet (PoE). If desired, an Ethernet

connection made to the secondary Ethernet

connector can provide access to a redundant

Dante network. Or it can be utilized as an ac-

tive “loop through” connection associated with

the primary Ethernet connection. If PoE is not

going to be utilized, or a redundant source of

power is desired, a source of 12 volts DC can

be connected by way of a 4-conductor XLR

connector.

A microphone can be connected using a

cable-mounted 3-pin male XLR connector.

A set of headphones, the headset portion of

a broadcast-style headset, or an earpiece

will be connected by way of a ¼-inch plug. If

Figure 1. Model 234 Announcer’s Console front and

back views

desired, the Model 234’s analog microphone

output may be interfaced with other equip-

ment using a cable terminated with a standard

3-pin female XLR connector.

For special applications the Model 234’s

internal circuit boards contain 3-pin “header”

connectors that allow access to various func-

tions. In addition, there are two spare con-

nector locations located on the Model 234’s

back panel. A technician can add connectors

and wire them to the headers such that ap-

plication-specific needs can be supported. For

example, a 6- or 7-pin XLR connector can be

added to support direct connection of broad-

cast-style headsets. Contact closures can be

interfaced to the Model 234’s circuitry, allow-

ing external switches to activate main and

talkback functions. A low-voltage/low-current

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ANNOUNCER’S CONSOLE

“tally” output associated with the main output

function is also available. Refer to the Techni-

cal Notes section of this guide for details.

One or Two Ethernet Connections

One 1000BASE-T (“GigE”) Ethernet con-

nection is required for Model 234 operation

and can provide both the Ethernet data in-

terface and power, by way of power-over-

Ethernet (PoE), for the Model 234’s circuitry.

A 10BASE-T connection is not sufficient. A

100BASE-TX connection may be adequate

but not optimal. The Model 234 supports Eth-

ernet switch power management, enumerat-

ing itself as a PoE class 3 device.

A second 1000BASE-T (“GigE”) connection

can be made if redundant Dante is desired.

(The Model 234’s network configuration within

the Dante Controller software application

must be set for Redundant for this functional-

ity to be active.) PoE is not supported on the

secondary Ethernet connection. The second-

ary Ethernet connection can also be used as

a “loop through” port such as would be pro-

vided by an Ethernet switch. (This requires

that the Model 234’s network configuration

within the Dante Controller software applica-

tion is set for Switched.) Switched mode is the

default setting but using the secondary port in

this mode for applications other than trouble-

shooting is not recommended. It will function

reliably but “daisy chaining” Ethernet signals

can limit flexibility and present a failure point;

it’s best if each Ethernet device connects

directly to a port on an Ethernet switch.

The Ethernet connections are made by way of

two Neutrik etherCON protected RJ45 con-

nectors that are located on the back of the

Model 234’s enclosure. These allow con-

nection by way of cable-mounted etherCON

connectors or standard RJ45 plugs. The

Model 234’s Ethernet interface supports auto

MDI/MDI-X so that a crossover cable is not

required. The Model 234’s primary Ethernet

connection will enumerate itself as a PoE

class 3 device.

External 12 Volts DC Input

An external source of 12 volts DC can be

connected to the Model 234 by way of the

4-pin male XLR connector which is located

on the back panel. While the requirement for

the external source is nominally 12 volts,

correct operation will take place over a 10

to 18 volts DC range. The Model 234 requires

a maximum of 550 milliamperes (0.55 am-

peres) at 12 volts DC for correct operation.

The DC source should be terminated to a

4-pin female XLR connector with pin 1 nega-

tive (–) and pin 4 positive (+).

If an external power source is required, the

PS-DC-02 power supply, available as an op-

tion from Studio Technologies, is directly com-

patible with the Model 234. Its AC mains input

allows connection to 100-240 volts, 50/60 Hz

with an output of 12 volts DC, 1.5 amperes

maximum. Its DC output is terminated on a

4-pin female XLR connector.

As previously discussed in this guide, an

Ethernet connection that provides power-

over-Ethernet (PoE) can serve as the Model

234’s power source. Alternately, an exter-

nal 12 volts DC source can be connected.

For redundancy, both PoE and the external

source can be connected at the same time. If

both PoE and an external 12 volts DC source

are connected, power will be drawn only from

the PoE supply. If the PoE source becomes

inoperative the 12 volts DC source will pro-

vide the Model 234’s power. No interruption

in operation will occur during a power source

transition.

Analog Microphone Input

Using a configuration selection within the

STcontroller software application, the Model

234’s microphone audio source can be se-

lected. In most cases analog will be selected

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MODEL 234

ANNOUNCER’S CONSOLE

and a local microphone will be connected.

Alternately, an audio signal can be provided

by way of a Dante receiver (input) channel. In

this section details on connecting an analog

microphone will be provided. The Model 234

provides a 3-pin female XLR connector, lo-

cated on the back panel, to allow a balanced

dynamic or phantom powered condenser

powered microphone to be connected. The

microphone can be a standalone handheld

(“stick”) type, a larger boom-mounted type,

or can be part of a broadcast-style headset.

The Model 234’s analog microphone input is

directly compatible with balanced, dynamic

or P48-compatible “phantom” powered micro-

phones. A microphone should be connected

such that its associated XLR connector has

pin 1 as common, pin 2 as signal high (+),

and pin 3 as signal low (–). A configuration

setting in the STcontroller application allows

the P48 phantom power source to be enabled

or disabled as desired. Another setting allows

the gain of the preamplifier circuitry associ-

ated with the analog mic input to be selected.

Details on configuration settings will be de-

scribed later in this guide.

While the Model 234 provides an excellent

source of P48 phantom power, it’s possible

that an input on an associated piece of equip-

ment is already providing microphone power.

This input could be connected to the Model

234 by way of the analog microphone output

connector. This would not create a problem

since the circuitry that passes audio from the

Model 234’s analog microphone output con-

nector to the Model 234’s microphone input

connector will also pass microphone without

interruption. This situation could be relevant

in cases where the Model 234’s analog micro-

phone output connector is interfaced with the

microphone input on a broadcast camera, au-

dio console, microphone mixer, remote input/

output rack, or similar equipment. Microphone

inputs on these devices would typically offer

phantom power which in some cases may be

enabled.

Analog Microphone Output

A 3-pin male XLR connector provides an

analog microphone-level output that’s directly

related to the analog microphone input. Tech-

nically the output is identical to the signal

that’s connected to the analog microphone

input but with a solid-state muting circuit in se-

ries with the interconnection. A configuration

choice in the STcontroller application allows

the operation of the microphone output to be

selected. The choices are to have the micro-

phone active at all times or for it to mute when

the Dante main output channel is also muted.

If the analog microphone output is configured

to be active at all times then it will provide

what is effectively an analog “hot mic” output;

a signal that is connected to the analog micro-

phone input will continuously “pass through”

to the analog microphone output. No Model

234 action will impact that signal. If the analog

microphone output is configured to follow the

status of the Dante main output the analog

microphone signal will pass through to the

analog microphone output connector only

when the Dante main output function is ac-

tive. Whenever the Dante main output chan-

nel is muted the microphone signal will not

pass through to the analog microphone output

connector; it is muted in an essentially click-

free manner. Refer to Appendix C for a block

diagram of the analog microphone input and

the analog microphone output circuitry.

The analog microphone output can be con-

nected to balanced (differential) analog mi-

crophone-level inputs on a variety of devices.

This includes microphone input connections

on remote I/O interfaces associated with a

networked audio console. An example of such

an interface would be the Calrec® Hydra2®.

The mic inputs on these devices typically

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MODEL 234

ANNOUNCER’S CONSOLE

offer microphone power, high-quality amplifi-

cation, and conversion to the digital domain.

The output signals of an interface’s pre-amp

channels are transported to the main elec-

tronics or console surface using a fiber optic

interface. In this type of application, the Model

234’s Dante main output channel would not

be used or would only be used as a backup

path. No preamplifier or other active circuitry

impacts the path from the Model 234’s mi-

crophone input connector to the Model 234’s

microphone output connector. But the signal

does pass through 200-ohm resistors in each

“leg” (pin 2 and pin 3) along with connect-

ing to a solid-state relay contact. The result

is that the source impedance of a connected

microphone will be 400 ohms greater when

presented to the microphone output con-

nector. This will slightly raise the theoretical

noise floor of the microphone signal vis-à-vis

a directly connected microphone signal but

shouldn’t impact any real-world applications.

Headphone Output

The Model 234 provides a 2-channel (“ste-

reo”) headphone output interfaced by way of

a 3-conductor ¼-inch phone jack. Devices

such as stereo headphones or dual-channel

(“dual-muff”) broadcast-style headsets can be

directly connected using a 3-conductor ¼-inch

plug. Following the usual convention, the left

channel should be terminated on the tip lead

of the plug, the right channel on the ring lead,

and common on the sleeve lead.

It’s also possible to use a single-channel/

monaural (“single-muff”) headset or broad-

cast-type single earbud but in these cases,

care must be taken. If a 3-conductor ¼-inch

plug is used by such a device it should be

wired to the tip and sleeve leads; the plug’s

ring lead should be left unconnected. But it’s

also possible that the monaural device will be

terminated on a 2-conductor (“tip and sleeve”)

plug. When the plug is inserted into the Model

234’s headphone output jack the Model 234’s

right headphone output channel will be short-

ed; the ring lead will be directly connected to

the sleeve lead. This can lead to stress on

the right channel headphone output circuitry

as well as extra current draw. To prevent this

undesirable condition, ensure that no input

audio signal is configured such that it’s routed

to the right headphone output channel. Refer

to the Configuration section later in this guide

for details on using the STcontroller applica-

tion to select the headphone audio routing to

best accomplish this condition.

Dante Configuration

For audio to correctly pass to and from the

Model 234 requires, as a minimum, that sev-

eral Dante-related parameters be configured.

These configuration settings will be stored in

non-volatile memory within the Model 234’s

circuitry. Configuration will typically be done

with the Dante Controller software application

which is available for download free of charge

at www.audinate.com. Versions of Dante Con-

troller are available to support Windows and

OS X® operating systems. The Model 234

uses the Broadway integrated circuit to imple-

ment the Dante functionality. The Model 234

is compatible with the Dante Domain Manager

(DDM) software application.

Audio Routing

The Model 234’s six Dante transmitter (Tx)

channels must be assigned to the desired

receiver channels on associated equipment.

This will route the Model 234’s main, hot

mic, and four talkback output channels to the

devices that will be “listening” to them. Within

Dante Controller a “subscription” is the term

used for routing a transmitter flow (a group of

output channels) to a receiver flow (a group of

input channels).

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MODEL 234

ANNOUNCER’S CONSOLE

The number of transmitter flows associated

with a Broadway integrated circuit and, as

such the Model 234, is 16 so no limitation can

exist. These flows can either be unicast, multi-

cast, or a combination of the two. (Note that

in the AES67 mode the transmitter (output)

channels will function in multicast; unicast is

not supported.)

Using Dante Controller, the desired audio

sources need to be routed to the six receiver

(Rx) channels associated with the Model

234’s Dante audio inputs. The exact number

utilized will depend on the specific application.

The six receiver channels are assigned to the

level encoders and can be used for listening

to the associated mix, mix-minus, intercom

channels, or general audio channels.

Unit and Channel Names

The Model 234 has a default Dante device

name of ST-M234- along with a unique suffix.

The suffix identifies the specific Model 234

that is being configured. The suffix’s actual

alpha and/or numeric characters relate to the

MAC address of the unit’s Broadway inte-

grated circuit. The seven Dante receiver (Rx)

audio input channels have default names of

Main 1, Main 2, Talkback 1, Talkback 2,

Talkback 3, Talkback 4, and Mic In. The

eight Dante transmitter (Tx) audio output

channels have default names of Main, Aux,

Talkback 1, Talkback 2, Talkback 3, Talk-

back 4, Phones L, and Phones R. Using

Dante Controller, the default device name and

channel names can be revised as appropriate

for the specific application.

Device Configuration

The Model 234 only supports an audio sam-

ple rate of 48 kHz with no pull-up/pull-down

values available. Encoding choices are PCM

24, PCM 16, and PCM 32, but in virtually all

cases the default selection of PCM 24 would

be appropriate. Clocking and Device Latency

can be adjusted if required but the default

values are typically correct.

Network Configuration – Dante

Redundancy

The Model 234 allows connection of two

Ethernet signals. Two RJ45 jacks are located

on the unit’s back panel and are labeled

Primary-PoE and Secondary. In the network

configuration Dante Redundancy section of

Dante Controller how these ports function

can be selected. The choices are Switched

or Redundant.

If Switched is selected (the factory default)

then the Model 234 will be able to establish

one connection with an Ethernet network.

It doesn’t matter which RJ45 is utilized, al-

though for PoE powering the jack labeled

Primary-PoE must be utilized. The other

RJ45 connection can be used to interconnect

with another piece of networked equipment.

If the Model 234’s network configuration is

Switched ensure that only one of the RJ45

connections on the back panel is connected

to the LAN associated with the Dante devices.

If both of the Model 234’s RJ45 connections

are routed to ports on the same LAN this will

typically “crash” the network! (Although some

of the latest/most-advanced Ethernet switches

will automatically detect and prevent an issue

from occurring.)

If Redundant is selected then Dante’s redun-

dant networking capability will be enabled.

In this case, separate network connections

should be made to the Primary-PoE and Sec-

ondary RJ45 connectors. A personal comput-

er that’s running STcontroller will typically be

associated with the network that is connected

to the Primary-PoE RJ45 jack.

When the Model 234 has been configured for

the Switched network mode one Dante IP ad-

dress will be associated with the network con-

nection that is made to either the Primary-PoE

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MODEL 234

ANNOUNCER’S CONSOLE

or the Secondary RJ45 connections. If the

network configuration has been configured for

Redundant then separate IP addresses and

related network parameters will be assigned

to the Primary-PoE and Secondary Ethernet

ports.

Network Configuration – Addresses

By default, the Model 234’s Dante IP address

and related network parameters will be de-

termined automatically using the DHCP or, if

not available, link-local network protocols. If

desired Dante Controller allows the IP ad-

dress and related network parameters to be

manually set to a fixed (static) configuration.

While this is a more-involved process than

simply letting DHCP or link-local “do their

thing,” if fixed addressing is necessary then

this capability is available. But in this case, it’s

highly recommended that every unit be physi-

cally marked, e.g., directly using a permanent

marker or “console tape,” with its specific stat-

ic IP address or addresses. If knowledge of a

Model 234’s IP address has been misplaced

there is no reset button or other method to

easily restore the unit to a default IP setting.

Note that if the Model 234’s network configu-

ration has been set for Redundant then the

Primary and Secondary Dante IP addresses

and related parameters can be independently

configured. This allows both interfaces to be

configured for automatic, both interfaces to

be manually configured, or one interface to

be automatic and the other to be manually

configured.

AES67 Configuration – AES67 Mode

The Model 234 can be configured for AES67

operation. This requires the AES67 Mode to

be set for Enabled. By default, AES67 mode

is set for Disabled.

Model 234 Clocking Source

While technically the Model 234 can serve as

a clock master for a Dante network (as can all

Dante-enabled devices) in virtually all cases

the unit will be configured to receive “sync”

from another device. As such, the check

box for Preferred Master associated with the

Model 234 would not be enabled.

Model 234 Configuration

The STcontroller software application is used

to configure the way in which the Model 234

functions. No DIP switch settings or other

local actions are used to configure the unit.

This makes it imperative that STcontroller be

available for convenient use on a personal

computer that’s connected to the related LAN.

Installing STcontroller

STcontroller is available free of charge on the

Studio Technologies’ website (www.studio-

tech.com/stcontroller-application/) and is

compatible with personal computers running

Windows operating systems that are version

7 and later. STcontroller versions 2.05.00

and later are required to fully support the

Model 234. If required, download and install

STcontroller onto a designated personal

computer. This personal computer must be

on the same local area network (LAN) and

subnet as the Model 234 units that are to

be configured. Immediately after starting

STcontroller the application will locate all the

Studio Technologies’ devices that it can con-

trol. The one or more Model 234 units to be

configured will appear in the device list. Use

the Identify command to allow easy recogni-

tion of a specific Model 234 unit. Double-

clicking on a device name will cause the

associated configuration menu to appear.

Review the current configuration and make

any changes that are desired.

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