Tait T2000 II Series Service Manual page 94

5.14 Fault Finding
• 14, 25, 72: These functions return a Boolean radio status value, either a '0' or a '1', as
follows:
Return Value
14 - read modem Rx state
25 - read Rx busy state
72 - read synth lock status
• 20: The receive audio is muted temporarily to quieten the speaker whenever the
radio is in transmit. This state may be temporarily overridden until the next receive
to transmit transition. If 'force Rx audio unmuted' (21) or 'let squelch control Rx
audio' (24) is requested when the radio is in transmit, the function will not be
selected until after the radio is in receive.
• 32, 33: Functions 32 and 33 are provided in MTM so that the radio transmit state can
be sustained without the need to hold the PTT depressed. Caution must be exercised
to prevent the power amplifier from overheating.
• 42, 43: Select economy/non-economy state. In economy state the audio power
amplifier is disabled and the front panel backlighting is set to its programmed econ-
omy state. In non-economy state, the audio power amplifier is enabled and the back-
lighting is set to its normal programmed state.
• 44, 45: Engage/disengage radio state for measurement of typical trunked mode sup-
ply current drain. In this state only the 'SVC' and 'C1' LEDs are switched on and
non-economy state is selected (function 43). Upon disengagement, the previous dis-
play is reinstated but the economiser state is not altered.
• 61, 62: To set up the RSSI thresholds, apply an RF signal to the radio (on an appropri-
ate receive channel) at the threshold level. Allow at least 400ms for the RSSI averag-
ing to settle, then select function 61 or 62 as required.
The averaged RSSI threshold value (in decimal full scale = 255) is either displayed if
in MTM or returned via the serial port if the radio is under computer control. The
value is also stored in the radio's database (in the microprocessor EEPROM) and the
database checksum is automatically updated.
• 63: In MTM, function 63 gives a regularly updated display of the averaged RSSI
value. The leftmost decimal point will light when the RSSI level equals or exceeds
L1, and the rightmost decimal point will light when the RSSI level equals or exceeds
L2.
In CCTM a single averaged RSSI value is returned.
At least 400ms should be allowed after any change in signal level for the returned
value to be accurate.
• 94: Returns the serial number part of the radio's ESN as a number of up to 6 digits
with leading zeros suppressed.
• 95: Returns the factory programmed 'factory model ID' as a string of six decimal
digits.
• 99: This function is intended to allow easy modification of the current channel
number via the number entry keys.
31/10/96
'0'
data = 0
no RF signal detected
out of lock
'1'
data = 1
RF signal detected
in lock
Copyright TEL
M2000-00