Midian RT-2 User Manual

Manual Revision: 2010-05-04

Covers Software Revisions:
RT-2: 1.3 and higher

Covers Hardware Revisions:
UED-1: 283C

RT-2

2-Tone Decoder

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SPECIFICATIONS

Operating Voltage +5.5-15 VDC
Operating Current 3 mA
Operating Temperature -30 - +60 C
PTT Output Current 200 mA
Horn Output Current 200 mA
Disable Output 200 mA
Input Level 25-500 mV RMS
Input Impedance 100 KΩ
Audio Output Level 1V RMS
Audio Output Impedance 10KΩ/22 KΩ

GENERAL INFORMATION

The RT-2 is a 2-Tone decoder module that is capable of decoding up to 3 different 2-Tone sequences. The RT-2
offers momentary and latched outputs and supports individual and long tone g ro up calls from 275 to 3500 Hz.

KL-3 PROGRAMMING

Midian’s RT-2 is programmed using the KL-3 or a 12-button row/column keypad. For keypad programming see
the Keypad Programming section below. Please refe rence the KL-3 manual for setup instructions of the KL-3
software and hardware. From the product selection screen on the KL-3 software, select the appropriate product
name from the list and click OK.

Set the parameters of the product to fit the application. If any clarifications on a feature are required, move the
mouse cursor over the feature name until the question mark appears and right click, a definition of the feature will
be shown.

After entering the parameters, save the file by going to File - Save As. Enter the file name in the File Name block
and click Save. Saving the file will allow for quick and easy reprogramming of units.

Connect the Orange/White wire to the Green KL-3 lead and the Black wire to a common ground with the KL-3’s
Black lead. The Yellow clip lead is not used with these products, as the RT-2 is non-readable.

Ground the PTT Input (Gray Wire); turn on power, and within 5 seconds click “Program Unit” in the menu bar to
send the file to the product.

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KEYPAD PROGRAMMING

If the RT-2 will be programmed with a 12-button row/column type keypad such as Midian’s Keypad Option C, the
RT-2 and the keypad should be oriented as shown below.

Midian Product

Keypad

There are 7 pins on the keypad and 8 pin holes on the Midian product. Pins 1-7 are used on the Midian product.
Pin 8 is only used if using a Row/Column Ground type keypad. The following diagram shows the pin numbers:

Pin 8 Pin 1

With the red, black and blue wires of the RT-2 connected, the keypad programming proces s may be done.
To enter programming mode on the RT-2 enter 27182818284 on the keypad.
The unit will beep 3 times to confirm entry into programming mode.
If during entry of a register’s parameters a mistake is made, before *n is pressed, entering the # key will clear the

register, so the register may be programmed properly. The programming register page at back of this manual can
assist with the keypad programming of the RT-2.

To program a register (registers 1-3), enter the desired information plus *n, where n equals the register number.
For example, 0349005105*1 would mean that 349.0 is the A tone and 510.5 is the B tone in the first decode
address followed by the standard ring code of 1. If the register is successfully programmed the unit will beep 2
times. If during entry of the register’s parameters a mistake is made, before *nn is pressed, entering the # key will
clear the register, so the register may be programmed properly.

To program a register (registers 7-9), enter the desired information plus *n, where n equals the register number.
If all entries in a reigster are not completed, trailing zeros will be automatically entered. Extra digits will be
ignored. If the register is successfully programmed the unit will beep 2 times.

REGISTERS:
Registers 1, 2, & 3

These fields set the tone sequence the RT-2 will decode. These fields are 11 digits in length. The first 5 are for
frequency A, 0250.0 – 3500.0 Hz. The second 5 are for frequency B, 0250.0 – 3500.0 Hz. If both the A tone and
the B tone are set for the same frequency, an additional 3.5 seconds will be added to the tone decode time
programmed in register 8. This allows for group call decoding of a single long tone used in so me systems.

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The final digit is for the ring code. Select from the following options:
0 – This will activate the latched monitor/squelch output, but produce no ringing tones. The momentary horn

output is disabled with this ring code.
1 – This will activate the latched and momentary outputs and produce a telephone like ring.
2 – This will activate the latched and momentary outputs and produce a pulsing ring tone.
4 – This will latch the horn output on until either the power is cycled or another sequence is decoded with a ring

code of 5. When using the horn output in a latched state the Monitor/Squelch Output is disabled.
5 – This will unlatch the horn output. When using the horn output in a latched state the Monitor/Squelch Output is

disabled.
8 – Turn off call lamp/mute. This resets the latched Monitor/Squelch Output.
9 – This will provide a latching output through Q7 that can only be reset by receiving the same sequence with this

ring code.

Register 7A – Set this register for either a 0 for Ground or a 1 for V+. This sets the Monitor Input Active Polarity.
Register 7B – Set this register for 00.
Register 7C – Set this register for .0-.9 seconds. This sets the length of time the transmitter will key-up for.
Register 7D – Set this register for 00.
Register 7E – Set this register for 0.
Register 8A – Set this register for .01-.99 seconds. This sets the decode time for the first tone in a decode

sequence. This time will also be applied to the second tone. The decode tone times should be set to
approximately 1/5 of the shortest encode time. Example: Motorola Quick Call 2 would be .20 for a 1 sec 3 sec
timing (20=200 ms).

Register 8B – Set this register for 00-99 seconds. This sets the length of time the unit rings when it decodes.
Register 8C – Set this register for 0-7. This sets the mode or tone the RT-2 will transpond in.
Register 8D – Set this register for 0-9 seconds. This field sets the time the momentary output will go to ground,

before going high again.
Register 8E – Set this field to 0 for ground or 1 for V+. This must match the squelch polarity of the radio, when

the radio is active. Squelch is controlled by the monitor input only.

Register 9A – Set this field to 00.
Register 9B – Set this field to 0.
Register 9C – Set this register to 0 for horn timeout in seconds and 1 for horn timeout in minutes. The horn

timeout is programmable for 0-9 in either 1 second or 1 minute increments depending on how this register is
programmed.

Register 9D – Set this field to 0.
Register 9E – Set this field to 0.

If all entries in a register are not completed, trailing zeros will be automatically entered. Extra digits will be
ignored. If the register is successfully programmed the unit will beep 2 times.

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