Jablotron DAVID GD-04 User manual - page 4

GD-04 DAVID 

4 

MKS51202_OS1* 

All parameters are sufficiently described on the page so that you do not need to use David’s 

installation or user manual to perform programming. 

Programming via the web site is free of charge. No user registration is required. Your David’s 

settings are not stored on the web server. Instead, you can save them as a file in your computer 

for future use (the file can then be imported to the page). The page does not allow you to 

retrieve the current settings of your David. Any programming is only possible if a valid access 

code is specified (the code, being a part of David’s settings, is not stored on the web server, only 

in your David). This makes the web access to your David both secure and simple. 

6.2.  Using a PC running GDLink software 

If you need to program David frequently, connecting David to a PC running specialized 

software is the recommended option. GDLink software allows you not only to send programming 

instructions but also to retrieve the current David settings. For the PC connection, you can use a 

GD-04P link cable connected to a USB port (the cable is supplied separately). GDLink software 

is available either in the GD-04P’s package or on the www.jablotron.cz web site.  

David’s communication protocol is available for use by other computer programs which can 

thus utilize GD-04 transfers (including programming instructions or GSM status information). 

6.3. SMS 

instructions 

David can also be configured via SMS instructions from your mobile phone. The programming 

instruction format is explained in the following example: 

PC, ARX, heating on, DRX, heating off 

where: 

PC

is the access (programming) code, required at the start of any programming 

SMS message* (2 to 8 ASCII characters, the factory default setting is PC)  

,

is a comma separator  

ARX

is the name of the instruction for programming the text you wish to use for 

switching relay X on via SMS. The desired text (“heating on”) follows, separated 

by a comma. 

DRX

is similar to ARX, related to switching relay X off. 

The above SMS instruction tells David that the X relay can be switched on/off by the SMS 

instructions “heating on” / ”heating off”. 

Note: This text distinguishes between SMS messages and SMS instructions – an SMS message 

can contain multiple SMS instructions in a sequence. 

SMS instruction rules: 

1.  Any programming SMS message must start with a valid access code (the factory default 

code is PC). Multiple messages mean multiple codes. 

2.  A single message can contain multiple instructions. David is capable of long message 

processing – if enabled by your phone, you can write and send a programming SMS 

message containing up to 2400 ASCII characters. 

3.  The comma separator is used both between individual instructions and between individual 

segments within instructions. 

4.  Spaces are ignored, except in operational texts which are meant to be a part of a David 

setting. 

5.  The successful processing of a programming SMS is confirmed from David by the SMS 

reply “PROGRAM OK”. 

6.  When an error is encountered, David reports a “PROGRAM ERROR” followed by the text of 

the instruction which has not been recognized. Preceding instructions within the message 

are carried out, succeeding instructions are ignored.