Motorola VRS750, Service Manual

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The portable operator sets the channel or mode select switch to the
position corresponding to the desired mobile mode and keys up the
portable. The VRS unit decodes the PL tone and steers the mobile radio
to the desired mode. There are two types of steering supported:
Transmitter Steering/Receiver Latching, and Transmitter Steering/
Receiver Steering.
NOTE: If mode steering is not selected during CPS
programming, the programmer will need to enter the
repeater access PL, which corresponds to a single access
PL with select mode steering.
Steering Types
• <Transmitter Steering/Receiver Latching>—On portable-to-base
repeating, the mobile radio is steered to the proper mode as
determined by the received PL from the portable. When the
portable dekeys, the condition to repeat ceases, and the mobile
radio remains on this mode. Thus, all future base-to-portable
repeating is heard via the mobile mode last steered by the
portable.
The mobile control head will display the steered/latched mode. If,
sometime after this operation and while no repeat is occurring,
the ICM user keys the mobile with the microphone’s PTT button,
the mobile will now transmit on the latched mode that is
displayed on the control head. If, however, the in-car-monitor
(ICM) user changes the selected mode using the mobile’s mode
rocker switch before pressing the mic PTT, the mobile will now
transmit on the new selected mode.
NOTE: For the above type of steering, the portable user will be
able to steer back to the selected user mode on the
control head by programming one PL destination for
Sel-Mode. However, the selected mode can be changed
by the rocker mode switch.
• <Transmitter Steering/Receiver Steering>—On portable-to-base
repeating, the mobile radio is steered to the proper mode as
determined by the received PL from the portable. When the
portable dekeys, the condition to repeat ceases, and the mobile
radio remains on this mode for 6 seconds. During this 6 seconds,
the VRS waits for a repeatable base-to-portable transmission to be
received.
• If a base-to-portable transmission is not received, the mobile
will return to the last mode selected by the control head’s
rocker switch (current user-selected mode).
• If a base-to-portable transmission is received during the 6-
second timer, the timer will be reset back to 6 seconds and
start over at the end of the transmission.
• If the portable is keyed during the 6 seconds, the VRS will
handle the destination PL accordingly and reset the timer. If
the 6-second timer has not expired, no repeat is occurring,
and the ICM user keys the mobile with a microphone PTT, the
mobile will transmit on the steered mode and the 6-second
timer will start over at the end of the transmission.