Table 2-1 Micro Controller Jumper - RELM BK RADIO SDMX920 Technical Manual

Base station and repeater

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Table of Contents

MX920 Base Station & Repeater

2.3.1.1

There is only one jumper and it is used for selecting the microcontroller operation

mode. The user will not normally have to change the position of this jumper as it is

only used in the initial factory setup.

Table 2-1 below summarises the functions of the jumper.

JMP

Function / Description

JMP 1 /

Selects either default single chip

CNVSS

mode or microprocessor mode for

the microcontroller.

2.3.1.2

The MX920 can operate in a number of different modes. The primary alternatives are

full duplex, which is the default mode, repeater and simplex. Using the built-in radio

configuration menu system, the operating mode is programmed for each channel.

When a channel is selected in operation, the MX920 adopts the mode programmed for

that channel. Repeater mode is easily selected from the front panel by depressing the

Repeater button. The front panel repeater button can also be lockout in software, to

prevent accidental turn off.

2.3.1.3

The MX920 has a channel capacity of 255. The RF and CTCSS frequencies for each

channel are programmed using the radio configuration menu system channel edit

screen. There are two ways of selecting the operating channel.

Software channel select. If the front panel push-wheel switch is set to 00 then it is

possible to send a software command to the radio to select the channel. In

addition, channel number 00 may point to another channel number in the channel

list, thus effectively providing 100 channels from the front panel channel

selector.

Front panel Push-wheel switches. The channel select port is internally wired to

the Push-wheel switches, the desired channel is simply dialled up on the

switches. The 99/100 channels are selectable on the front panel. This channel

selector has the added advantage of displaying the current channel even when the

power is turned off.

The following rules apply.

♦

The front panel push-wheel switches have priority. If push-wheel switches SW1

are not set to 00, the software command will be ignored.

The exact functionality and available features will also depend upon the firmware

version installed.

2.3.1.4

The MX920 has an LED to display the status of alarms. The alarm trigger conditions

can be set using the built-in radio configuration menu system software. The ALERT

LED an be set to trigger on low forward power, high reflected power, power supply

Micro Controller Jumper