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RTU-292C Operations Manual
2-9
2.8.7
DIAL MODE
The dialing mode of the RTU-292C’s internal telephone is set by internal dipswitch SW1-4. The
dial mode choices are DTMF and 10pps Pulse. DTMF should always be used if the RTU-292C
is interfaced with a touch-tone (DTMF) capable telephone line. Note that, even when set for
pulse dialing, the RTU-292C can still send DTMF tones onto the phone line to control automated
systems such as voice mail. After a call has been placed, the user may press either the star (*) or
pound (#) key. The RTU-292C will then produce DTMF tones in response to keypad presses
from the front panel keypad. Once the current call is terminated, the RTU-292C will revert to
the pulse-dialing mode.
Table 2-7
Dial Mode
SW1-4
Dial Mode Selection
Off
DTMF *
On
Pulse (10 pps)
2.8.8
TELEPHONE RING VOLUME
The telephone ringer volume may be set to a comfortable level with internal adjustment R156.
If the ambient noise level in the RTU-292C’s location makes it necessary to change the ringer
volume, rotate R156 clockwise to increase the volume and counterclockwise to decrease it.
2.8.9
FULL/HALF DUPLEX RADIO
In full duplex operation, the RTU-292C will simultaneously send transmit audio to the radio and
take in its receive audio. In half duplex operation, the radio receive audio is muted while the
radio is keyed. This prevents a radio sidetone audio feedback loop in radios with sidetone audio.
This feedback loop hampers RTU-292C VOX operation. (Sidetone audio is transmit audio that
is internally routed back into the receive audio when the radio is keyed, allowing the radio
operator to hear his transmission.)
The Full/Half Duplex selection is set by dipswitch SW2-8. The factory setting is SW2-8 On, for
Half Duplex, preventing the feedback loop. To set to Full Duplex operation (receive audio not
muted during transmit), set SW2-8 to Off. For Simplex Systems, use the Half Duplex setting.
Table 2-8
Full/Half Duplex
SW2-8
Full/Half Duplex
Off
Full Duplex
On
Half Duplex *
2.8.10
SERIAL PORT BAUD RATE
Internal dipswitches SW1-1 and SW1-2 on the Main board configure the RS-232 baud rate of the
unit's serial port as shown in the table below. The factory setting is 9600 Baud.
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