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BRUEL & KJAER 2236 Application Note
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BRUEL & KJAER 2236 Application Note

Using modems with sound level meters
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APPLICATION NOTE
Using Modems with Sound Level Meters
Sound Level Meters are often used for
monitoring in remote places, and you
may want to "monitor the monitor" or
transfer measured data to your home-
base PC, without going to the measure-
ment site. A telephone connection —
wired or wireless — is a convenient way
to transfer measurement data. And mo-
dems are a vital link in the chain of trans-
mission. This application note explains
what equipment you need and how to
use it.
Please note that only Brüel & Kjær Types
2236 and 2260 are supported for modem
connection. Types 2231, 2237 and 4436
need special handshaking modes, which
cannot be activated via modem.

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Summary of Contents for BRUEL & KJAER 2236

  • Page 1 Please note that only Brüel & Kjær Types 2236 and 2260 are supported for modem connection. Types 2231, 2237 and 4436 need special handshaking modes, which cannot be activated via modem.
  • Page 2 Using Modems with Sound Level Meters 2260 Semi-permanent Monitoring Kit A sound level meter for monitoring in the field needs protection against weather and tampering, and it needs a power supply other than its internal batteries. Also, you need space and power for the modem. For the Investigator Sound Level Analyzer Type 2260, the 2260 Semi- permanent Monitoring Kit is available.
  • Page 3 This section shows how to capture sound measurements from a remote Sound Level Analyzer (Investigator Type 2260) via telephone lines and standard modems. Precision Integrating Sound Level Meter Type 2236 may also be used. The field equipment is illustrated in Fig.
  • Page 4 Fig. 3 Standard modem set-up B&K 2236 or 2260 Hayes ¤ Compatible Modem PC running Evaluator Type 7820 Dumb Auto Answer Modem (Multitech MT 2834ZDX) 980001e Fig. 4 shows the complete system including the home-base modem. Fig. 4 System diagram. The diagram...
  • Page 5 Mains adaptor (supplied) or Brüel & Kjær 9 V DC SLM-modem cable AO 0567 Brüel & Kjær 2260 (or 2236) Brüel & Kjær SLM power 12 V DC from QB 0051 or Brüel & Kjær Mains Power Supply ZG 0386 (EU)
  • Page 6 Click on the Test the connection… button to launch the Serial Commu- nications Tool. If your modem is properly connected to the PC, all the status indicators except DCD should show . To verify that the modem is recognized enter the letters A and T in the String to be transmitted box and click on the Enter button.
  • Page 7 Hardwire. 6. Press the <OK> button twice. Now your 2236 has the right communication set-up and you can con- tinue to set up the measuring parameters. As the Evaluator can only remote control 2236 to start and stop measurements via the Autolog to log command, you must start the initial log by specifying the sampling interval, for example, Autolog to log every 1 min.
  • Page 8 Setting up the Home-base Modem After connecting the modem to your PC using the modem-PC cable, you configure software. Windows 95 Windows NT4.0, you must install the modem via the control panel in Windows first. Start the Evaluator Type 7820. Choose Options… on the Tools menu. Next select the Modem tab.
  • Page 9 Select the COM-port and Baud Rate. In the INIT command and in the DIAL command you can insert any string that the software should send to the modem during initialization and dialing. Start by putting ATZ in the init command and ATDT in the dial command. If more than one command is needed for initialization just put <cr>...

  • Page 10: Wireless Modem

    This section shows how to capture sound measurements from a remote sound level analyzer (Investigator Type 2260) via GSM transmission in the field and standard telephone lines and modems at the home-base. (Precision Integrating Sound Level Meter Type 2236 may also be used). The field equipment is illustrated in Fig.
  • Page 11 Community noise Notebook/PC calculations 970556e Fig. 7 Wireless modem set-up PC running Hayes ® Compatible Evaluator Modem Type 7820 Brüel & Kjær 2236 or 2260 Siemens Mobile Dataphone M1 Modem at GSM Operator GSM Net Operator 970560e 2260 Semi-permanent Monitoring Kit...
  • Page 12 Brüel & Kjær Antenna + mounting See section “Antenna” below Mobile-phone supplier SLM-Modem cable AO 1440 Brüel & Kjær 2260 (or 2236) Brüel & Kjær 2260 Semi-permanent BZ 7202 – 302 (English) Brüel & Kjær Monitoring Kit BZ 7202 – 303 (French) BZ 7202 –...
  • Page 13 Wireless Modems — Siemens M1 Mobile Dataphone Fig. 8 Siemens M1 Mobile Dataphone At the field end we need a device which is a combination of a mo- bile phone and a modem. A suit- able device is the Siemens M1 — it runs on 12 V external DC supply, and it has a 9–pin RS –232 inter- face to the built-in modem which...
  • Page 14 Then click on the Test the connection… button. By entering AT and clicking on the Enter button the M1 should answer The command AT+CSQ indicates the signal quality (a number between 0 and 31, where 31 is the best). The command AT+COPS? shows whether you have been registered on the network or not.
  • Page 15 Enter Command Significance Table 5 Siemens M1 programming commands ATS0= 1 Answer after 1st ring AT\N6 Operating mode: Non-Transparent, with RLP protocol ATB98 Operating mode: Autobauding Modem, 9600 Baud ATQ1 No Result codes AT&Y0 Load User Profile 0 at power-up AT&W0 Write the new configuration to non- volatile memory as User Profile 0...
  • Page 16 Wireless Modems — Modem Hand-switch ZH 0457 The Modem Hand-switch ZH 0457 serves to supply power from the 12 V Battery QB 0051 to the Siemens M1 Mobile Dataphone. Fig. 9 Modem Hand-switch ZH 0457 The M1 is supplied with a split cable for supply from 12 V power (and for the antenna).
  • Page 17 7. Wait until the green power indicator on the M1 stops flashing (it may take up to 10 s). 8. Now the M1 cable or the 12 V connection may be disconnected. Warning: The above sequence should always be followed, otherwise damage may result to the M1 or the SIM card.
  • Page 18 The home-base modem should be set up as described in the Standard Modems — Home-base Modem section. The SLM The 2236 or the 2260 should be set up as as described in the Setting up the 2236 for Modem Transfer Setting up the 2260 for Modem Transfer sections, except that the baud rate must be set to 9600.
  • Page 19 APPENDIX 2: Software Update for Siemens M1 When ordering the Siemens M1, make sure it supports NON-TRANSPAR- ENT data transfer. This means that the M1 firmware must be version 4.02 or later. If not, you can get it from Siemens. Also you can get a description of the new software features (Word file M1-nt2.doc) from Siemens.
  • Page 20 HEADQUARTERS: DK-2850 Nærum · Denmark · Telephone: +4545800500 · Fax: +4545801405 · http://www.bk.dk · e-mail: info@bk.dk Australia (02)9450-2066 · Austria 0043-1-8657400 · Belgium 016/449225 · Brazil (011)246-8166 · Canada: (514)695-8225 China 1068419625/1068437426 · Czech Republic 02-67021100 · Finland 90-229 3021 · France (01)69906900 · Germany 06103/908-5 Hong Kong 25487486 ·...

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