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1. What is G-SPEAK ULTRA?

2. Important Safety Instructions

3. Glossary of Terms

5. Product Identification

6. Product Dimensions

5.1. G-SPEAK ULTRA

6.1. G-SPEAK ULTRA

5.2. Calling Module

6.2. Calling Module

7. Functional Feature Highlights

8. Device Layout and Wire Connections

9. LCD Interface

4. Technical Specifications

The G-SPEAK ULTRA promotes the ultimate in convenience and peace of 

mind by combining wireless GSM technology with CENTURION’s futuristic and 

stylish ULTRA interface. Infused with the DNA of innovation, the G-SPEAK 

ULTRA allows wireless communication between the user and the intercom gate 

station, effectively turning the user’s phone into the intercom handset.

Filter Time:

 Filter Time determines how long an input event (Rising or Falling 

Edge) must be present before it is recognised, i.e. an SMS or email is sent, or 

a missed call is initiated. The time is set in increments of one second and the 

default is 0.  

Blanking Time:

 Blanking Time determines how long the unit will wait 

between events before it will recognise the next event.

Hang Time:

 The time for which the call remains connected after a DTMF 

event.

Any Number Mode:

 When enabled, this useful feature allows any number 

to activate the module’s outputs, irrespective of whether they are learned into 

memory. A typical application would be an event such as a wedding where 

many guests need to be given temporary access. Instead of manually learning 

in a 100 guests and then having to delete them again after the occasion, 

the administrator can simply enable Any Number Mode and disable it again 

afterward.

DTMF:

 Dual Tone Multi-Frequency signaling. This is used for 

telecommunication signaling over analogue telephone lines in the voice-

frequency band between telephone handsets and other communication devices 

and the switching centre. This allows the user to press a number on his or her 

mobile handset to switch any of the outputs on the G-SPEAK ULTRA.

Channel:

 An electrical gateway implemented as a physical terminal on the 

G-SPEAK ULTRA that provides the external interface to Input or Output signals

Called Party: 

When one of the Call Buttons on the Calling Module is pressed, 

the Called Party is the person or persons who receives/answers the call on 

their mobile phone or landline handset.

Calling Module: 

This can be seen as similar to a traditional intercom 

gate station or entry panel that resides outside of the property and is the 

component of the G-SPEAK ULTRA system that is used to dial through to and 

communicate with Voice Phones.

GSM Controller: 

A module using 2G GSM (Global System for Mobile 

Communications) technology to communicate wirelessly with GSM-enabled 

handsets, allowing both audible communication and monitoring and switching 

of Inputs and Outputs.

Voice Phone: 

A Voice Phone pertains specifically to the intercom functionality 

of the G-SPEAK ULTRA system, and is any learned-in phone with the ability to 

communicate audibly with the Calling Module, but is also capable of activating 

any of the Outputs during a call using DTMF signaling.

Switch Phone: 

A Switch Phone is a learned-in phone that is capable of 

exercising some influence upon the Outputs of the controller via GSM switching 

and does not necessarily possess Voice Phone functionality, though it can be 

learned in for both.

Access Number Profiles

The access number configuration profiles eliminates the hassle of configuring 

input and output permissions and notifications every time that a new number 

is added.  

Intelligent Gate Status Monitoring

With seamless integration with CENTURION gate motors, the G-SPEAK ULTRA 

will let the user know when his or her gate has been left open, or is in any 

other state specified by the user through intelligent monitoring of the gate 

motor’s status output. Adjustable Filter settings mean that the user can specify 

under which conditions they are notified about a particular gate status, for 

example if the gate has remained open for longer than 20 seconds.

Supplied with activated SIM card (South Africa only)

All G-SPEAK ULTRA units are supplied with an activated Vodacom SIM card 

(South Africa only). Airtime can be purchased via G-WEB (South Africa only).

Monitoring and alerting

The device can be configured to monitor up to four separate electrical devices, 

such as a home alarm or even a water reservoir. It could send the user an 

SMS, give a missed call or even send an email, letting the user know if the 

house alarm is on or off or a reservoir is full or empty. When configured as 

inputs, the unit’s four individually-configurable channels can be configured 

to react to Rising Edges, Falling Edges, or both, which makes it ideal for 

monitoring variable levels such as mains power. A single input can be used, for 

example, to send a notification to users when mains power has failed, and the 

same input can notify users once it comes back on, freeing up the other inputs 

to take care of monitoring duties for other devices.

Control

When configured as outputs, the device’s dry contacts can be used to remotely 

control electrical devices and appliances such as gate motors, alarms, geysers 

and lights, to name but a few possible applications. Outputs can be activated 

via missed call, SMS text message or by pressing a number on the user’s 

phone’s touchpad. 

Timed access control

(Weekly and Visitor) Set arrival and departure dates and times; guests will 

only be able to activate the device’s outputs between these limits, affording 

the user maximum security and affording guests maximum convenience. As a 

special value-add developed specifically with B & B owners in mind, customised 

arrival and departure messages with welcoming messages, access instructions, 

etc., can be sent automatically to guests and visitors.
Alternatively, set weekly recurring time-periods (for example 8am to 5pm, 

Monday to Friday) during which users will have access to the system.

Outside of the configured time-periods, access will be denied. 

Add the ability to map inputs to outputs, customise the input and output 

notification messages and use the G-SPEAK ULTRA in advanced applications 

 

and one has a powerful and convenient GSM-based monitoring and control 

solution. Up to 20 separate text messages with up to five scheduled outputs 

can be configured.
Time-barring windows can be configured to block notifications, activations or 

specific access numbers.

Quick device associations

Devices can be associated to a G-WEB profile in a matter of seconds by simply 

scanning a QR code with one’s smartphone and a third-party universal QR 

scanner application. 

Table 3 below lists the information shown on the different screens found 

on the LCD interface. The left and right scroll buttons are used to toggle 

between the different screens.

Easy access to diagnostics

This smart device provides intelligent feedback via a graphic user interface 

displaying status, system information and diagnostic messages for the 

complete ULTRA experience.

Smart hardware

An internal GSM antenna ensures healthier, more reliable network signal 

strength without the frustration of trying to find the optimal location to 

mount the unit. If one needs to fit the G-SPEAK ULTRA in a metal enclosure, 

simply attach an external antenna to the onboard connector.

Time-barring per call button

 

Each call button can be individually time-barred. For example, the primary 

button can be time-barred so that only the secondary call button works 

during the evenings or early in the morning while the primary call button is 

disabled.

1.  Do not install this product near DOSS sensor inside gate motor housing or 

near the remote receiver.

2.  Do not install this product near any sensitive electrical components.
3.  All installation, repair, and service work to this product must be done by a 

suitably-qualified person.

4.  Do not in any way modify the components of the system.
5.  Do not install the equipment in an explosive atmosphere: the presence of 

flammable gas or fumes is a serious danger to safety.

6.  Do not leave packing materials (plastic, polystyrene, etc.) within reach of 

children as such materials are potential sources of danger.

7.  Dispose of all waste products like packing materials, according to local 

regulations.

8.  Centurion Systems (Pty) Ltd does not accept any liability caused by 

improper use of the product, or for use other than that for which the 

automated system was intended.

9.  This product was designed and built strictly for the use indicated in 

this documentation. Any other use, not expressly indicated here, could 

compromise the service life/operation of the product and/or be a source of 

danger.

10. Anything not expressly specified in these instructions is not permitted.

1. Fascia
2. External Antenna Cover
3. Main Unit
4. Mounting Plate

1. Back Cover / Mounting Panel
2. Voice Communication Terminals
3. Call Button 1
4. Call Button 2

5. Terminal Blocks
6. Navigation panel
7. LCD Screen

5. Microphone
6. Front Cover / Fascia
7. Speaker

This icon indicates tips and other information that could be useful 

during the installation.

TABLE 1

TABLE 2

FIGURE 1

FIGURE 2

FIGURE 4

This icon denotes variations and other aspects that should be 

considered during installation.

Supply Voltage Range

11-24V DC

Maximum Current Draw

300mA @ 12V DC

Input/output Current Rating

50mA (Open Collector)

Input Sense Voltage Range

0-24V DC (0-1.6V Low-input State, 

5V-24V High-input State)

SIM Card

Micro-format, Activated SIM

Card Supplied (South Africa only) 

1, 2

Number of Configurable Input/

output Channels

4

Call Buttons on Calling Module

2

Call confirmation at Calling 

Module

Yes

Speech volume

Adjustable at Calling Module using Call 

Buttons

Calling Module illumination

Call Buttons and labels with back-lit 

white LEDs

Memory Capacity 

• 5000 Event logs
• 

20 Access Profiles

• 1 Custom Welcoming SMS Message for 

New Access Numbers

• 20 Custom Output Activation SMS 

Messages (From User to Device)

• 

30 Custom Input Notification SMS/Email 

Messages (From Device to User)

• 100 Visitor Time-barring Windows 

(Windows are the periods between two 

dates)

• 30 Generic Time-barring Windows 

(Windows are weekly recurring)

• 10 Output Activation Schedules 

(Schedules are weekly recurring)

• 3 Daylight Saving Periods
• 4 Input to Output Mapping 

Configurations

Model Options

GSM 2G

:  

850/900/1800/1900MHz (EDGE)

GSM 3G

:  

900/2100MHz (EDGE)  

900/2100MHz (UMTS)

GSM 3G PENTA

800/850/900/1900/2100MHz (UMTS)

microS

IM

SIM Card

Optional:

 External Antenna

NOTE:

 

The 

Internal Antenna

 is  

selected by default.

Scroll Left

Scroll Right

Enter / 

Home

GND

IO4

P4

IO1

P1

P5

IO2

P2

P6

IO3

P3

VIN NEG

GND

Ground

IO1

Input / Output 1 (Default: Output)

IO2

Input / Output 2 (Default: Output)

IO3

Input / Output 3 (Default: Output)

IO4

Input / Output 4 / Gate Status Input (Default: Output)

P1

Data Communication Line

P2

Data Communication Line

P3

Data Communication Line

P4

Data Communication Line

P5

Data Communication Line

P6

Data Communication Line

VIN

Positive of Power Supply 12-24VDC

NEG

Negative of Power Supply

Home Screen

Network Name or Phone Number Applicable 
to Incoming / Outgoing SMS or Call.

IO Status Screen 

Network Signal Strength

Connected to Internet  

Device has Error Condition

Incoming SMS

Outgoing SMS

Outgoing Phone Call Events 

Connected to G-WEB

Incoming Phone Call Events 

1

3

4

2

2

3

4

1

5

6

7

7

5

6

FIGURE 3

73.6mm

114.4mm

33mm

G-SPEAK ULTRA

QUICK GUIDE

GSM-BASED INTERCOM SYSTEM

Centurion Systems (Pty) Ltd

www.CentSys.com

www.centsys.com

Doc number: 1265.D.01.0004_2

SAP Code: DOC1265D0104

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Call Centurion Systems (Pty) Ltd 

.

 South Africa

Head Office: +27 11 699 2400

Call Technical Support: +27 11 699 2481

from 07h00 to 18h00 (UTC+2)

E&OE Centurion Systems (Pty) Ltd reserves the right to change any 

product without prior notice

All product and brand names in this document that are accompanied b

y the ® 

symbol are registered trademarks in South Africa and/or other countries, in fa

vour 

of Centurion Systems (Pt

y) Ltd, South Africa.

The CENTURION and CENTSYS logos, all product and br

and names in this 

document that are accompanied by the TM symbol are tr

ademarks of Centurion 

Systems (Pt

y) Ltd, in South Africa and other territories; all rights are reserved. 

 

We in

vite you to contact us for further details.

Centurion Systems is a Company of the

FAAC  Simply Automatic Business Unit

138mm

110mm

18mm

74mm

Calling Module

Back / Mounting Panel

32mm

Input: Deactivated 

(“E” = Input event reached)
Input: Activated (pulled to ground)

(“E” = Input event reached)

Output: Off

Output: On (pulling to ground)

1. May not be used in devices other than G-ULTRA (South Africa Only).

2. Remains the property of Centurion Systems (Pty) Ltd. (South Africa Only).

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