jablotron DAVID GD-04 User Manual

GD-04 DAVID 12 MKS51203

Table 1 – A brief list of programming SMS instructions

Any programming SMS message must start with a valid access code (see 6.3).

Example: PC, ARX, heating on, DRX, heating off

Function

Instruction Description

Factory

default

Relays X and Y operation

SMS to switch relay ON

ARX, xxx..x Use ARY for relay Y. xxx..x = text (up to 30

characters), text erased by ARX , ,
Example: ARY,ventilator on

erased

SMS to switch relay OFF

DRX, xxx..x Use DRY for relay Y. xxx..x = text (up to 30

characters), text erased by DRX, ,
Example: DRY,ventilator off

erased

Relay switch-on period

TMX, t..t

Use TMY for relay Y.
t..t = switch-on period in seconds, or zero

• 1 to 10h entered in seconds, minutes(m) or

hours(h) (3600s = 60m = 1h)

• The relay works as a time-switch, activated via
switch-on SMSes or dialling-in. Deactivation is by
time-limit expiration or via switch-off SMSes.

• 0: no time-limit applies, dialling-in is responded to
with toggle logic: on – off – on…

0

(no limit)

Telephone numbers
authorised for relay control

ADX, x..x,x..x

Use ADY for relay Y.
x..x = tel. number. Up to 50 numbers can be ent ered

(in a single instruction or gradually). The numbers
are added to the list of authorised numbers.
Example: ADX, 777123456, [phone]
authorises two new numbers for relay X control.

Telephone numbers
authorised for relay control
with a validity limit.

LDX, x..x,n,
x..x,n

Use LDY for relay Y.
x..x = tel. number. The numbers are added to the list

of authorised numbers, up to 50 in total.
n = limit in the number of calls (1 to 99), exceeding
the limit removes the number from the list – this is
reported to the service number by SMS.
Example: LDX, 777123457, 31 authorises a new
number for relay X control for a maximum of 31 calls.

empty

list

Erasing tel. numbers
authorised for relay control

EDX, x..x, x..x Use EDY for relay Y. x..x = tel. number. The

numbers (up to 50) are removed from the list.
Example: EDX, 777123457 de-authorises a
single tel. number used for relay X control.

–

Input A to D activation/deactivation SMS reports

Input activation text

ATA, xx..x

Use ATB for input B, etc.

xxx..x = text (up to 30 characters*)

Example: ATC, heating on
Instruction ATA , , erases the text = no reports

A1,
B1,
C1,
D1

Input deactivation text

DTA, xx..x

Use DTB for input B, etc.

xxx..x = text (up to 30 characters*)

Example: DTC, heating off
Instruction DTA , , erases the text = no reports

A0,
B0,
C0,
D0

Telephone numbers for input
reports

TNA, x..x, x..x

Use TNB for input B, etc.

x..x = tel. number, up to 8 for each input. All

previously stored numbers are erased. Use TN A,
to empty the list.
Example: TND, 777123456, 608123456 sets
David to report input D events to 2 numbers

empty

list

Input-event calls

DNA, n Use TNB for input B, etc., n = 1 (ON), 0 (OFF). If

set to ON, every SMS report is followed by a call.
If you answer the call, you hear a constant tone =
activation, or an interrupted tone = deactivation.
Example: DND, 1

OFF

GD-04 DAVID 1 MKS51203

The GD-04 “David” GSM communicator

User manual

The GD-04 module got its name from David, a biblical king who outsmarted Goliath, a giant. In our
case, Goliath is meant to be the GSM network. We hope that the skills of your tiny David will help you
manage the giant.

1. Basic description

SIM

Bus connector

Battery connection

LED indicator

RESET jumper

GSM antenna

Ta bs

SIM card

Output fuses

1.1. David provides:

• 2 output contacts of power relays X and Y (each allows up to 5A/250V)

• 4 input terminals A to D for SMS reporting (the inputs react to a connection or disconnection

to or from a common GND terminal)

GD-04 DAVID 2 MKS51203

1.2. David can be used as:

• A switch with SMS remote control. SMS texts for switching particular terminals on/off are

configurable.

• A time-switch which can be activated remotely via a mobile phone (the switch-on period is

configurable from 1 second to 10 hours).

• A relay with dialling-in remote control. Up to 50 tel. numbers can be authorized for each

relay. Because calls are not answered dialling-in control within GSM is free of charge. (David
only checks the caller’s number and – if the number is authorized – responds with relay
activation.) This can be used for parking latch control etc.

• A relay with validity-limited dialling-in remote control. Each authorized number can have

a limit to the number of calls. When the call count reaches the limit the tel. number is de­authorized. This can be useful for pre-paid services such as e.g. parking. Any tel. number can
be re-authorized via SMS by the administrator.

• An SMS reporter. Input A to D activations or deactivations can be reported by SMS and

optionally confirmed by phone calls. Each input can have its own message texts and up to 8
tel. numbers programmed.

• Examples of David applications can be found on http://www.jablotron.cz/david/en/examples.htm

1.3. David can be supplemented with:

• A GD-04A back-up module, which provides David with the ability to work approx. 12 to 24

hours continually without an external power supply, (see 11.1).

• A GD-04D DTMF module, which allows you to control David’s output relays by entering

numeric codes (DTMF codes) on the telephone keypad during calls, (see 11.2).

• A GD-04P link cable, which allows you to connect David to a PC through a USB port and

perform any desired configuration using GDLink software (see 11.4).

• A GD-04R radio module, which allows input A to D activations via wireless buttons or

detectors of the OASiS series and also provides David with the capability of output relay X or
Y state transmission to UC or AC OASiS receivers. In addition, you can control relays X or Y
“locally” via RC-8x keyfobs (so that an appliance can be controlled both via a mobile phone
and a keyfob). The module also allows heating control (again locally or remotely via a mobile
phone) using wireless thermostats of the TP-8x series (see 11.3).

A detailed description of optional accessories can be found in chapter 11.

2. David’s SIM card

• In order to function, David needs a SIM card, preferably a tariffed one.

• Test the SIM card by using it in your mobile phone – SMS sending and calling must work

correctly.

• Switch off the PIN code protection via the phone menu (or set the PIN code to 1234).

• Check the GSM signal strength in David’s location.

3. Installation

1. The GSM antenna should not be shielded by metals. If necessary, an external antenna
designed for the 900/1800MHz GSM band can be connected via a 50Ω SMA connector.

2. Open the cover and release the electronic circuit board by pressing the tabs.

3. Mount the rear plastic cover at the desired location.

4. Insert a SIM card: Open the SIM card case by shifting the moving part in the direction of
the terminals and tipping it off. Make sure that the card is correctly oriented and insert it.
Close the SIM card case (fold and re-shift the moving part).

GD-04 DAVID 11 MKS51203

David’s settings

Input’s SMS reports

Relays operation

*)

Only available for the GD-04D version

Wireless items

*)

Enrolled Type Device code Place

Input A

Input B
Input C
Input D

Relay X
Relay Y

*)

Only available for the GD-04R version

SMS when activated
SMS when deactivated

Input A

Phone numbers

SMS when activated
SMS when deactivated

Input B

Phone numbers

SMS when activated
SMS when deactivated

Input C

Phone numbers

SMS when activated
SMS when deactivated

Input D

Phone numbers

ON command SMS: DTMF code:

*)

OFF command

SMS: DTMF code:

*)

Relay X

Tel. numbers
authorized for
relay control

ON command SMS: DTMF code:

*)

OFF command SMS: DTMF code:

*)

Relay Y

Tel. numbers
authorized for
relay control

GD-04 DAVID 10 MKS51203

12. Specification

Power supply 11 – 13 V DC

Stand-by consumption approx 20 mA

Max. consumption (during communication) 500 mA

GSM band E-GSM 850 / 900 / 1800 / 1900 MHz

RF output power 2 W for GSM 850 / 900, 1 W for GSM 1800 / 1900

A, B, C and D input terminals activated by a connection to GND
Output contact rating X1,X2 a Y1,Y2

Resistive load max. 2,5A / 250V AC

Inductive (capacitive), lamp load max. 0,5A / 250V AC

Can be operated according to ERC/DEC/(94)01

Safety EN 60950-1

EMC EN 301489-7, EN 55022 and EN 50130-4

Radio transmissions ETSI EN 301419-1 and EN 301511

Environment II. indoor general (-10°C to +40°C)

Dimensions (without antenna) 76 x 110 x 33 mm

GSM antenna connected to SMA connector

JABLOTRON ALARMS a.s. hereby declares that this product
is in compliance with the essential requirements and other
relevant provisions of Directive 1999/5/EC. The original of
the conformity assessment can be found on the web site

www.jablotron.com, Technical Support section.

Note: Although this product does not contain any harmful
materials we suggest you return the product to the dealer or
directly to the manufacturer after use.

GD-04 DAVID 3 MKS51203

5. Insert the circuit board back to its position.

6. Do the wiring, see below.

4. Wiring

1. Power supply – use the +12V and GND terminals (grey
colour = +12V). Any power supply adapter used should
provide 12V DC voltage and up to 500mA of current. Do
not turn the power supply on until all input / output wiring
has been done.

2. Output relay contacts – available
at the X1+X2 and Y1+Y2 terminals.
Each contact is fused to 5A. The
circuits which the contacts belong to
are protected from the remaining
electronics by a safety separator
and are capable of switching up to

2.5A at 250V AC. The following
example shows a light bulb control via the Y output relay:

3. Input terminals – marked A to D. The terminals respond to a
connection or disconnection to or from GND by sending an SMS
report. No external voltage supply can be connected to these
terminals – they can only be controlled via a potential-free
switch/contact. Example of wiring a switch to input A:

5. Initial powering up

1. Turn the power supply on, registering to the GSM network is indicated by the LED
flashing (if no indication occurs, check the power supply wiring).

2. After GSM registration the LED stops flashing (usually within 1 minute). Continued

flashing indicates a GSM registration fault. Disconnect the power supply and check that a
valid SIM card has been correctly installed into the device, see 2 and 3).

3. Send the SMS instruction STATUS to David’s SIM card number.

4. David responds by a status report, e.g. STATUS: A0,B0,C0,D0,X0,Y0,GSM:80%,
Vcc:12.2V (which means that all A to D inputs and both the X and Y relays are switched off,
the GSM signal strength is 80% and the power supply voltage is 12.2V). Depending on the
GSM network traffic the response may take some time. If no response occurs, verify that

“STATUS” is spelt exactly right in the text of the message and that you are sending the
message to David’s correct SIM card number (repeat the previous step).

6. Programming

6.1. Via the Internet

The simplest way to program David is via the web site www.david.jablotron.cz.

You fill in all the required parameters in a form on a single web page, press the Send button,
and the Jablotron web server will forward the settings to your David via the GSM network.
Performance of a successful transfer is confirmed from David by an SMS reply "PROGRAM OK"
to your mobile phone.

Switch

12V DC
power supply

_

+

230V/50Hz

Light bulb