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CHAPTER 4: OPERATION
Operating Modes
The CS-540 has three different modes of operation: repeater mode, base station mode, and auxiliary mode.
By default, it operates in repeater mode unless you explicitly change modes. This chapter will give you a
brief overview of each of the modes. The individual modes are covered in detail in the chapters that follow.
Also in each of the various operating modes an external peripheral can be connected to the accessory
connector located on the rear of the unit. Through programming, the external peripheral can be made to
work in conjunction with the repeater. The CS-540 will ‘remember’ the mode it was in prior to powering the
repeater down. When powered back up, it will revert to the mode it was in prior to power down.
Repeater Mode: The CS-540 is a full-featured community repeater with programmable settings for channel
spacing, TX Timeout, and CWID broadcasting preferences. In repeater mode, the CS-540 will listen for calls
from any user that belongs to the currently selected channel. If it detects a CTCSS tone or DCS code of a
valid user, it will repeat the call with the appropriate CTCSS/DCS encoding. While in repeater mode, the CS-
540 can also be remotely programmed using a two-way radio capable of generating DTMF tones. For more
information on repeater mode, see “Chapter 5: Repeater Mode”. For more information on remote
programming, see “Chapter 8: Remote Programming”.
If an external peripheral such as a phone patch is used in conjunction with repeater Mode, the external
peripheral will gain control of the transmitter upon engaging the external PTT line. When the external PTT line
is engaged, the circuit is designed to break the connection between the RX Module and the TX Module so that
the external peripheral has control. The transmit options of the user in Slot 1 will be utilized. If
necessary, the repeater supports a programmable COS output on pin 17 to be interfaced with the peripheral.
Base Station Mode: The CS-540 is a full-featured base station with programmable settings for busy queuing
and busy channel lockout. By attaching an optional microphone, the CS-540 can communicate as any user on
the selected channel. For more information, see “Chapter 6: Base Station Mode.” If an external peripheral
such as a DC Remote is used in base mode the transmit options of the user in Slot 1 will be utilized
when the external PTT line is engaged.
Auxiliary Mode: AUX mode can serve many purposes. Placing the CS-540 in AUX mode disables the internal
controller and allows for the unit to be totally controlled
by an external peripheral. During AUX mode, the
display illumination level may also be changed and the transmit RF power can be enabled/disabled, also, the
composite input feature can be enabled/disabled. For more information, see “Chapter 7: Auxiliary Mode”.
Channel and User Database
Before you begin reading about the various modes of the CS-540, it is helpful to know how the channel and
user database is constructed. You may program up to 16 channels for the CS-540 to use. At any time, only
one channel is active. You can select which channel you would like activated by scrolling through the list of
channels using the up () and down () keys on the CS-540’s front panel. Each of the 16 channels has
unique settings for broadcast ID, broadcast interval, Morse code rate, receiver frequency, transmitter
frequency, channel spacing, power, and TX Timeout time. These settings are explained in more detail in
“Chapter 5: Repeater Mode.” In addition, base station settings are determined on a per channel basis. Base
station settings include busy lockout, busy queuing, busy queue timeout, system hold time, and marked idle.
These settings are explained in more detail in “Chapter 6: Base Station Mode”. Each channel can support up
to 64 users. Each user is assigned a particular slot within the channel. User slots are numbered sequentially
from 0 to 63. Slot 0 is the System Operator, which is the only user with remote programming privileges. This
is explained in more detail in “Chapter 8: Remote Programming”. The remaining slots (1 through 63) are for
common users, and no preference is given to users based on their order within the slots.
Each of the 64 users has unique settings for user ID, status, RX signaling, TX signaling, courtesy tone, TX hold
time, and tone-in-tail. These setting are explained in more detail in “Chapter 5: Repeater Mode”.
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