MCTR43401R, MCTR43402R, MCTR43404R
1, 2, 4-Channel Input and Output 434MHz Transceiver with Frequency Selection

Description

Operating Range
The transceiver operates on 434MHz with 10mW of RF power. Using Elsema’s ANT433S-SMA antenna it is possible to get up to 2 Km line of sight communications. This range can be doubled by configuring an extra MCTR43404R as a repeater.            

Supply
The transceiver can be connected to either AC or DC. The power supply has built-in protections against surges, transients and power failures. Even if there is a power failure on one transceiver the built-in handshake acknowledgments will ensure that the transceivers inputs and outputs are returned to the same state as before the power failure.  Connecting an Elsema BACH12 or BACH24 battery charger to the power supply will allow you to connect a battery or solar power for backup supply. The transceivers are rated to operate continuously in harsh environments.

Built-in testing and diagnostics
Several times a day, the transceivers will send a self test signal. This will not change any inputs or outputs. If this communication fails the transceivers LED’s will flash orange. This condition will indicate that something has failed in the RF link, eg broken antenna.

Inputs and Outputs
Inputs
There are four normally open inputs. When these inputs are close (Shorted to GND) the signal is transmitted and the respective relay output will be turned on. There are four on board test buttons that allow you to test each input. Just below the test buttons are the holes to solder the external switches for the four inputs. See picture below.

Outputs
Each relay output can switch up to 8 Amps, 240VAC. There are four relay outputs and statues LED’s. The LED’s indicate if the relay is activated. The relay modes are user selectable for momentary or flip flop. Other modes can be added at customer requests. Call Elsema.

Different Relay Output Modes
The 4-Way dip switch sets the relay output mode to either momentary or flip-flop.

With the switch is “off” the relay is in momentary, switch “on” sets the mode to flip-flop.

Optional analogue Input and Output upgrade
The transceiver has the option for 1 analogue input and output, e.g. 4 - 20mA or 0 - 5Volts. Call Elsema.

Digital Coding
The transceivers have a 12-way dipswitch. This should be set to a random position since it will set the ID of the transceivers. Different systems operating in a close proximity should be set differently to prevent false triggering. Make sure that dipswitch 1 to 8 are different on each system.

Do not use all “off” on the 12-way dip switch. This is used for factory test mode.

LED colours
Green LED indicates signal transmission
Red LED indicates that a relay has been activated.
Orange LED flashing indicates RF link failed (Communication failure)

Transmission Modes
The transceiver can be user configured to four different transmission modes.

Mode1

Simple transmit and receiver – Transceiver is used to send the signal one-way to activate a relay. Used for simple on/off functions. See diagram below.

* Both transceivers should be set to Mode 1

Mode 2

Transmit and receiver with acknowledgment – Transceiver is used to transmit a signal to another transceiver. If the second transceiver receives a valid signal it will return a signal back to the first transceiver and a relay and LED is turned “On”. This LED will indicate which relay is “on” at the remote site. See diagram below.

With mode 2 you will need to set the momentary or flip flop mode the same in both transceivers and one of the transceivers should be set as a slave. This is done by cutting the wire strap which is labelled slave.

* Both transceivers should be set to Mode 2

Mode 3

Repeater with one way communication – The repeater mode is used to increase the transmitting range. The repeater will receiver the signal and then re-transmits the original signal on a different frequency. Re-transmitting the signal on a different frequency allows you to chain link unlimited number of repeaters. To chain link repeaters the frequency needs to be correctly set on each repeater. See table mode 3 in operating frequencies. Only signals that match the repeaters 3 – 8 dip switches will be repeated. See diagram below.

Mode 4

Repeater with return acknowledgment - The repeater will receiver the signal and then re-transmits the original signal on the same frequency. The final transceiver will send back a signal, via the repeater, to indicate which output is activated. Only one repeater can be used in this mode.

With mode 4 you will need to set the momentary or flip flop mode the same in both transceivers and one of the transceivers should be set as a slave. This is done by cutting the wire strap which is labelled slave.

Setup with Acknowledgment
With mode 2 and 4 you will need to set the momentary or flip flop mode the same in both transceivers. One of the transceivers should be set as a slave. This is done by cutting the wire strap which is labeled slave. See picture below.

Changing the transmission modes.
On the back of the transceivers there are four square pads. These pads are used to change the mode of the transceiver. See picture below.

Transmission Mode 1 : No link on any of the pads, both transceivers should be set to Mode 1.
Transmission Mode 2 : Outer pads shorted, both transceivers should be set to Mode 2.
Transmission Mode 3 : Inner pads shorted
Transmission Mode 4 : Both Outer and Inner pads shorted

In all transmission modes there is a 5 minute transmission limit to comply with radio regulations.

Warning : These pads are electrostatic sensitive. Touch yourself and the iron on a metal surface before touching the pads. Failure may result in the IC being permanently damaged.

Operating Frequencies
If you need two or more systems to operate simultaneously in the same area you can set different frequencies by setting the dip-switch 1 and 2 on the 12-way dip switch. Dipswitch 1 and 2 set the operating frequency. See table below for more information.

If transceivers are operating on the same frequency and the frequency is in use by another transceiver the second transceiver will “listen before transmit” and automatic re-transmit when then frequency is available. This prevents jamming which could result in a loss of signal. This allows the transceivers to operate with a high level of signal reliability, even in close proximity of other radio transceivers.

Product History

The version is written on the crystal as shown in the picture below.

Antenna
The transceiver has a 50 ohms SMA connector to allow a proper 433MHz antenna to be connected. Elsema stocks the ANT433S-SMA suitable for connection to the transceiver. See picture below.

Customised Software

Case
The transceiver can be supplied without a case, this allows the unit to be integrated according to your needs.
The C160 case and QM150 mounting bracket can be used to enclose the MCTR43404R transceiver. The C160 has an IP rating of 54.Two cable compression glands are provided with the case. The transceiver with a case is known as a MCTR43404RE. E is for Enclosed.

Click image to enlarge

Application Notes

Example 1:
Here a security guard is monitoring at transceiver that has three lights and a buzzer connected. The three lights represent three different locations and the buzzer alerts the guard that an alarm has been activated.

At each of the three locations you have a transceiver. At these locations you wire a single button that will activate two inputs in parallel, one for the light and the other for the buzzer. This signal will be transmitted to the security guard house.

Example 2:
Here a farmer uses three transceivers to monitor the water level of his tank and control the pump.

MCTR43404R-T: Transceiver at the Tank.
MCTR43404R-P: Transceiver at the Pump. (Not needed if the pump is next to the tank).
MCTR43404R-M: Transceiver at the Monitoring station.

Water tank level is constantly monitored with 4 inputs,
Input 1 Empty, (Switch On pump)
Input 2 25% full,
Input 3 75% full and
Input 4 is Full tank (Switch off pump).

When the tank level drops to the empty level the MCTR43404R-T will automatically activate its own relay output 1 and also transmit this signal to the MCTR43404R-M and an optional MCTR43404R-P.

If the pump is next to the tank the relay output 1 should be wire to the pump, otherwise you can use the MCTR43404R-P to wirelessly control the pump. The pump is used to fill the tank. The relay output 1 (Pump Control) will remain on until there is an activation on Input 4. This means the tank is full and will automatically switched “off” relay output 1 (Pump is off). The relay “off” signal is also transmitted to the MCTR43404R-P.

At the monitoring station is a MCTR43404R-M that indicates what is happening at the tank and pump. For example, lights will show when the pump is “on” and the level of his tank.

Relay output 2 will be activated when there is an error in the tanks level inputs. For example, if the empty and full inputs are “on”.

Relay output 3 will be activated when the RF link has fail, eg broken antenna.

Relay output 4 is spare option.

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Products in the Range

Technical Data

Block Diagram

MCTR91508SS

Application

MCTR43404R 12/24 VAC Application

MCTR43404R 110/240 VAC Application

12-Way Dipswitch Setup Instructions

Example 1:
Using a 4-channel MCTR43404R receiver.

If the MCTR43404R has 0101 0100 1000 set to the 12 way dipswitch, this sets the receiver first relay (Ch.1) to position 9 i.e. 1000. The other channels are sequentially placed.

This is shown in the table below:

To program a 2-channel MCTR43402R transmitter to the receiver relay channel 7 and 8 you need to set the 2 channel transmitters dip switch to 0101 0100 1110.

To program a 1-channel MCTR43401R transmitter to receiver relay channel 3 you need to set the transmitters dip switch to
0101 0100 1010.

Example 2:
Using two separate 2-channel MCTR43402R receiver coded to one 4-channel MCTR43404R transmitter.

If one of the MCTR43402R receiver has 0011 1100 1000 set to the 12-way dipswitch, this sets the receiver first relay (Ch.1) to position 9 i.e.  1000. The second relay (Ch.2) is sequentially placed to position 10 i.e. 1001.

Set the second MCTR43402R receiver to 0011 1100 1010 (position 11). Again, the other relay channel is sequentially placed to position 12 i.e. 1011.

Set the four channel MCTR43404R transmitter to 0011 1100 1000.  This sets the transmitters first button (Ch.1) to position 9 i.e. 1000. The other channels are sequentially placed i.e. button 2 is position 10, button 3 is position 11 and button 4 is position 12.