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Using with Campbell Scientific Dataloggers 

6.  Configuring the TC35T for use with a Datalogger  

Before you install the TC35T, you must configure it and store the settings in its 
non-volatile memory so that when power is applied it works in the correct way 
with the datalogger. 

If your TC35T is supplied in an enclosure with a datalogger and 
other peripherals, it will normally be pre-configured with the correct 
baud rate and with the default settings. Normally no further 
configuration is required, unless you wish to change the error 
correction mode. 

6.1  Setup 

To enable configuration: 

1.

 

Connect the TC35T to a PC. The serial port on the TC35T allows a direct 
connection to a PC ‘AT’ (9-way) style serial port with a cable that has a pin to 
pin connection system. A Campbell Scientific SC12 cable can be used if no 
other cable is available. 

2.

 

Connect the TC35T to a suitable power supply, ensuring that the power control 
line is held high to force the TC35T to remain switched on permanently during 
configuration. 

3.

 

Select a suitable terminal emulation package (e.g. HyperTerminal, included 
with Microsoft Windows 95/98) to communicate with the TC35T in order to 
configure it. Campbell Scientific’s Term or GT programs can also be used, 
with the datalogger type set to NONE. In the first instance set the terminal 
emulation package to communicate at 9600 baud, 8 bits, 1 stop bit, 1 start bit 
and no parity. The terminal type emulation is not important 

4.

 

To check communications with the TC35T type 

AT&F

 and press 

ENTER

. The 

TC35T should respond on the following line with 

OK

. This resets the TC35T to 

the default settings. Please refer to the TC35T manual for full details of the 
commands. The TC35T uses a similar command set to a ‘Hayes-compatible’ 
telephone modem, with the addition of some extra commands for the 
configuration of the GSM module functions. 

5.

 

The default baud rate setting for the TC35T is automatic baud rate detection. 
You need to set this to fixed operation at 9600 baud for use with Campbell 
Scientific dataloggers. To change the setting type 

AT+IPR=9600

. This will 

change the communications speed and write the setting to non-volatile 
memory. If someone has set another fixed baud rate you may have to 
experiment in changing the terminal emulation baud rate until you get the 
TC35T to respond, allowing you change and fix the rate at 9600 baud. Please 
remember that some terminal emulators, such as HyperTerminal require you to 
click on the disconnect button and then reconnect before the changes to 
communications baud rate come into effect. 

If you get the response ‘ERROR’ or ‘4’ after entering the 
above AT commands, please ensure that the terminal 
software is set up to communicate via the COM port to which 
the TC35T is connected, and 

not

 

with any internal modem 

which may be fitted in the computer.  

NOTE 

CAUTION 

Summary of Contents for Siemens TC35T GSM

Page 1: ...Siemens TC35T GSM Digital Transceiver Instructions for Use With Campbell Scientific Dataloggers Issued 11 12 03 Copyright 2003 Campbell Scientific Ltd...

Page 2: ......

Page 3: ...lieu of all other guarantees expressed or implied including those of suitability and fitness for a particular purpose Campbell Scientific is not liable for consequential damage Please inform us befor...

Page 4: ......

Page 5: ...odem as a Base Station 11 6 3 2 Configuring the TC35T as a Base Station using PC208W 11 6 3 3 Extending the Default Time Outs 11 6 4 Ending a Call 12 7 Datalogger Programming Hints 14 7 1 Controlling...

Page 6: ...PIN configuration 4 Appendix D Using the TC35T with Storage Modules D 1 D 1 Introduction 1 D 2 The Problem Explained 1 D 3 Solutions 1 Figures 1 Connection of SC932C to TC35T 4 2 Connecting the TC35T...

Page 7: ...to allow data devices to be connected It has the following features Standard RS232 serial port Relatively low power consumption Wide operating temperature range 20 C to 55 C Can be used to collect dat...

Page 8: ...1 2 Network Coverage One of the main advantages of using a cellphone network is being able to set up a communications link to a datalogger virtually anywhere without installing land or telephone lines...

Page 9: ...ll normally apply to such calls too Where many calls have to be made in quick succession ISDN digital landlines can be used with a digital terminal adaptor in the calling PC If correctly supported and...

Page 10: ...modules connected to the datalogger please see Appendix D for advice on possible problems you might encounter 3 1 SC932C Interface This is the preferred interface because If the TC35T is programmed to...

Page 11: ...as shown in Figure 3 Fit the SC32A s internal jumper so that synchronous data such as data intended for a Storage Module will not be sent to the TC35T Configure the TC35T see Configuration for the GSM...

Page 12: ...y be necessary to move this wire to the 12V supply to ensure that the module is powered continuously The TC35T may not power up correctly if its power cable is removed and re inserted while 12V power...

Page 13: ...radiator is positioned away from other vertical metal structures It should also be at a distance from any sensors so that it does not either physically or electrically interfere with the sensor readi...

Page 14: ...ured using a crimping tool or pliers The connector is only suitable for use in dry environments and so must be protected from direct exposure to water and precipitation Figure 4 Low cost dual band ant...

Page 15: ...tion package to communicate at 9600 baud 8 bits 1 stop bit 1 start bit and no parity The terminal type emulation is not important 4 To check communications with the TC35T type AT F and press ENTER The...

Page 16: ...a null modem cable or older dataloggers such as the CR7 and 21X ATS0 1 Set the TC35T to auto answer incoming calls ATV0 Numeric result codes the TC35T will not respond with OK to this or following co...

Page 17: ...se also contact your cellular network support team for advice on any problems that you might encounter 6 3 2 Configuring the TC35T as a Base Station using PC208W The TC35T should first be set up as if...

Page 18: ...3000 or even 4000 may be required to allow the error correction process to function Where a TC35T is used as the base station modem it is advisable to increase these delays even more by perhaps anoth...

Page 19: ...for further details To allow the TC35T to receive calls program the datalogger to set the relevant control port high to turn the TC35T on The TC35T will not answer an incoming call when the power cont...

Page 20: ...r is limited and the turn on time has to be kept very short it is critical to ensure that the PC and datalogger clocks are not allowed to drift apart otherwise the PC may try to call when the TC35T is...

Page 21: ...phone modules can also be deregistered from the cellphone network This means that they are effectively logged off the network preventing new incoming calls The reasons this can happen are that the ne...

Page 22: ...s While the chances of getting bad data stored to disk are very small because of the error checking protocols used the speed at which data is collected can fall markedly if the link is very noisy This...

Page 23: ...ather than modem negotiation tones beep and whistles the SIM is configured to accept incoming digital UDI calls only contact the SIM supplier 8 3 I get Errors when using the TC35T with Storage Modules...

Page 24: ......

Page 25: ...1 10 and later respectively If you have one of these dataloggers with an older operating system you should contact Campbell Scientific to arrange an upgrade Users of other dataloggers e g the 21X CR1...

Page 26: ...send the PIN 3 Do P86 1 21 Set Flag 1 Low 4 End P95 Now immediately call P97 to send the PIN unlock sequence This needs to start straight away after the TC35 is turned on so that it does not get locke...

Page 27: ...response 9 Extended Parameters 4 Digit P68 1 2 Option 2 characters 2 48 Option 0 3 13 Option CR 4 0000 Option 5 0000 Option 6 0000 Option 7 0000 Option 8 0000 Option Now the instructions to turn it o...

Page 28: ...0 0 13 _________ 0 0 0 14 _________ 0 0 0 15 _________ 0 0 0 16 _________ 0 0 0 17 _________ 0 0 0 18 _________ 0 0 0 19 _________ 0 0 0 20 _________ 0 0 0 21 _________ 0 0 0 22 _________ 0 0 0 23 ___...

Page 29: ...Scientific if further advice on these techniques is needed If a TC35T with the PIN feature enabled is to be used with a PC as the base station the CPIN nnnnnn command can be included at the end of th...

Page 30: ......

Page 31: ...A higher when communicating via this port compared to using an SC932C connected to the CS I O port However the quiescent current is lower by a few hundred microamps If using this port and Instruction...

Page 32: ...o so in the UK If you are sure that your network provides this facility called V42bis compression please contact Campbell Scientific for details of how to use higher baud rates and how to enable data...

Page 33: ...s industry can be found at the European Telecommunications Standards Institute ETSI web site at www etsi org C 1 Signal Quality Checks AT CSQ Signal Quality Test command AT CSQ Response CSQ list of su...

Page 34: ...err Parameter See set command Set command AT COPS mode format oper Response TA forces an attempt to select and register the GSM network operator If the selected operator is not available no other ope...

Page 35: ...CREG stat lac ci when n 2 and there is a change of network cell OK Parameter n 0 disable network registration unsolicited result code 1 enable network registration unsolicited result code CREG stat 2...

Page 36: ...eceding command was acknowledged with error CME ERROR 18 Set command AT CPIN pin newpin Response TA stores a password which is necessary before it can be operated SIM PIN SIM PUK PH SIM PIN etc If the...

Page 37: ...collected correctly However because of the original failure there will be an extra delay of around 20 seconds before the data starts to be collected If the extra delay time is set to more than 2000ms...

Page 38: ...on the delays in the network and the amount of data transferred However with this method you can set the extra response delay to a higher value if needed Use a separate setup when the TC35T is commun...

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