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RTU-292 Operations Manual
3.4.10 TRANSMITTER KEYING, FULL DUPLEX SYSTEM
In a full duplex system, the transmitter can be held continuously keyed during a conversation,
because the system can receive and transmit at the same time. Thus, VOX is not required. In
this case, the transmitter may be keyed from the RTU-292 by pulling either of its external KEY
inputs low. The Full/Half Duplex dipswitch setting has no effect on transmitter keying.
3.5 REMOTE KEY
The RTU-292 contains a remote /Key signal that can be activated at any time. The unit will
key the transmitter any time this input is pulled low while the power is on.
3.6 SELF TEST
The RTU-292 self-test routine operates each time the unit is powered up. This routine tests the
non-volatile RAM for out-of-range parameters and various functions of the DSP module. The
unit also performs a "Walking LED" test, turning each of the front panel LEDs on in
succession, providing an indication of correct I/O operation. A successful self-test will be
indicated by the "Positive Acknowledge" tone prompt and, if the Voice Prompt Option is
enabled, the “RTU-292 Automatic Phone Patch” greeting prompt. Failure of the self test (or
failure of the DSP module at any time) is indicated by a long "Negative Acknowledge) tone and
a constantly blinking PEAK LED. The radio connect functions of the unit will not operate,
although the telephone may continue to operate.
3.7 AUTOMATED OPERATION
The RTU-292 can patch the telephone line to a radio system completely unattended when in the
Automated Operation Mode. To enter this mode, simply press the AUTO ANSWER
pushbutton. The unit will signal its present status and request remote operator responses
through the use of Tone Prompts and (if equipped) with actual voice messages called voice
prompts.
3.7.1 TONE PROMPTS
The RTU-292's tone prompt sequences and their meanings are:
3.7.1.1 Positive Acknowledge (ACK)
When the RTU-292 wants to signal an acknowledge it will play 1 short high-pitched tone
followed by 1 short low-pitched tone. The RTU-292 usually plays an ACK in response to a
user-initiated command. ACK means that the command was received and was legitimate
3.7.1.2 Negative Acknowledge (ERROR)
When the RTU-292 wants to signal a negative acknowledge or error it will play 1 long low-
pitched tone. An ERROR is usually played as a response to incorrect user entry, or following
the receipt of an illegitimate command that could not be executed.
JPS Communications, Inc.
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