TM8100/TM8200 Service Manual General Information 123© Tait Electronics Limited November 20074.8 Computer-Controlled Test Mode (CCTM)The servicing procedures require a radio to be placed in the computer-controlled test mode. In this mode CCTM commands can be entered at thetest PC. These commands are then relayed via the test unit to the radio.Certain CCTM commands cause the radio to carry out particular functions;others read particular settings and parameter values in the radio. The CCTMcommands of use in servicing radios are listed in Table 4.2 to Table 4.6,grouped according to category.Terminal Programfor CCTM Use the calibration application to place the radio in CCTM. To do this, runthe calibration application, select Tools > CCTM, and click the CCTM Modebutton. For more information, refer to the online help of the calibrationapplication.You can also use the HyperTerminal utility which is supplied with MicrosoftWindows. As a preliminary, first select the settings for the communicationsport as follows:1. Open the terminal program. (In the case of HyperTerminal, clickStart > Programs > Accessories > Communications > HyperTerminal.)2. In the terminal program first select the COM port to which the radiois connected. Then select the following settings for the port:■ bits per second : 19 200■ data bits : 8■ parity : none■ stop bits : 1■ flow control : none.3. Click the OK button (or equivalent).4. Save the file with the port settings under a suitable name.For subsequent sessions requiring the terminal program, openthis file.Invoking CCTM Using the terminal program, place the radio in CCTM as follows:1. Enter the character ^ to reset the radio.2. As soon as the radio is reset, the letter v is displayed. (If an uppercaseletter V appears, this implies a fault.)3. Immediately the letter v is displayed, enter the character%.(The character% must be entered within half a second of the letter vappearing.)4. If the character% is accepted, the character – is displayed in response,and the message Test Mode appears on the radio display. This impliesthat the radio has entered CCTM. If the attempt fails, repeatSteps 1 to 3.
