118 General Information TM8100/TM8200 Service Manual
© Tait Electronics Limited June 2006
4.8 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 the
test 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 par ticular settings and parameter values in the radio. The CCTM
commands of use in servicing radios are listed in Table 4.3 to Table 4.7,
grouped according to category.
Terminal Program
for CCTM
Use the calibration application to place the radio in CCTM. To do this, run
the calibration application, select To o l s > C C T M , and click the CCTM Mode
button. For more information, refer to the online help of the calibration
application.
You can also use the HyperTerminal utility which is supplied with Microsoft
Windows. As a preliminary, first select the settings for the communications
port as follows:
1. Open the terminal program. (In the case of HyperTerminal, click
Start > Programs > Accessories > Communications > HyperTerminal.)
2. In the terminal program first select the COM port to which the radio
is connected. Then select the following settings for the port:
â– bits per second : 19 200
â– data bits : 8
â– parity : none
â– stop bits : 1
â– 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, open
this 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 uppercase
letter 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 v
appearing.)
4. If the character% is accepted, the character – is displayed in response,
and the message Te s t M o d e appears on the radio display. This implies
that the radio has entered CCTM. If the attempt fails, repeat
Steps 1 to 3.
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