GPRS communication protocol

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tonyd10111

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Topic # 59347 2-Apr-2010 18:50

I am trying to reprogramme a piece of equipment that requires the correct GPRS communication protocol for the Vnz Network.

I have tried calling them to assist me and have been given the shove around.

Is there someone that can assist me with the protocol.

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Reply # 314225 2-Apr-2010 19:12

tonyd10111:I have tried calling them to assist me and have been given the shove around

Welcome to Geekzone

So let me get this right you rung Vodafone NZ on 777 or 0800 800021 expecting a CSR to answer your question about GPRS communication protocol?

John

johnr

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Reply # 314228 2-Apr-2010 19:17

Just a FYI GPRS is a standard GSM packet switch protocol over a 2G network

If you make your question more clear I should / might be able to answer it

Thanks John

sbiddle

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Reply # 314251 2-Apr-2010 20:51

What are you actually wanting to know? There isn't really much to configure other than APN settings. There certainly is no "protocol" as such.

tonyd10111

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Reply # 314281 2-Apr-2010 22:04

What I need is the actual string to rewrite into the device to allow my unit to lock onto the signal. I believe it is the "string" ....

tonyd10111

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Reply # 314282 2-Apr-2010 22:06

The string that is written into the unit works in every other country except here. That's why I need the string that is used in Nz ... Hope that helps?

freitasm

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Reply # 314299 2-Apr-2010 22:47

And what's that string? A modem initialisation string, or the APN name?

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tonyd10111

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Reply # 314308 2-Apr-2010 23:23

This is the string that the unit sends out...040331141830+UB04+terminal ID +4+GPRMCdata +10000000L000000^ . This is the one that doesn't work

sbiddle

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Reply # 314336 3-Apr-2010 07:56

What sort of device is it? That string means nothing to me - it's not a normal GPRS init string that you'd normally expect on a modem which is just a standard AT dial command.

It's not box from Australia that's trying to call or set up an 0403 mobile number?

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Reply # 314339 3-Apr-2010 08:09

That string doesn't look like a GPRS/Packet data initialisation string. Is this the one to initialise the modem, or the one being sent by the terminal *after* the connection is established? GPRMCdata is a GPS/NMEA code, not GPRS.

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Reply # 314341 3-Apr-2010 08:16

tonyd10111: The string that is written into the unit works in every other country except here. That's why I need the string that is used in Nz ... Hope that helps?

No does not help one little bit

johnr

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Reply # 314342 3-Apr-2010 08:17

So you are %100 sure its GPRS and not CSD?

tonyd10111

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Reply # 314347 3-Apr-2010 10:25

This is what I'm trying to determine. I have a gps tracking unit that sends text and won't lock into GPRS. I need the GPRS to establish real time tracking... I know Its all over the place , but I can only share with you what I know

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Reply # 314353 3-Apr-2010 11:21

What is the sms part for? I am not sure how I can help when you are not sure about things yourself

tonyd10111

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Reply # 314364 3-Apr-2010 11:54

I take it you understand the fundamentals of realtime gps tracking... In order to get a realtime location using packet data, you need the GPRS to be locked and working. At the moment all um getting is texted long and lat from the unit. Now you should be able to use the packed data stream if the GPRS is going. Hence saving you money. Now the unit will work anywhere in the world on GPRS, using voda nz data cards, except in nz. On making enquiries to the manufacturer I was told that the string, which us constant everywhere in the world, works everywhere else in th world, it should work in nz.

Now, I'm faced with the challenge of getting this unit to work here. The unit works... I know this. I can get a location by text, every 30 secs, but this doesn't help. The GPRS initial string needs to be updated on the unit for it to work. It's this string that I need.

I hope this helps.

tonyd10111

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Reply # 314366 3-Apr-2010 12:00

This is the excerpt from the maual

1 Primary Roll call Message

Message Field
Field Value
Type
Length (in bytes)
Description
Start Identifier
*
CHAR
1

SN/Time

C_STRING
12

Command Word
DB00
C_STRING
4

Terminal ID
Terminal ID
C_STRING
15

Message Body
Message Contents
C_STRING
3

Message Contents
LOG
End Identifier
^
CHAR
1

Example:
*040331141830DB00LOG ^
This message means: The message is sent at 14:18:30 on 2004-3-31, the message type is downlink alarm message, and the message is a downlink primary rollcall message.
Response
The terminal responds with UB04.
Example:
*040331141830+UB04+terminal ID +4+GPRMCdata +10000000L000000^
Sending Mode
GPRS
Description
This message is applicable to all terminals.

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