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GLR2708
8-Channel 27MHz Gigalink™ Receiver with Open Collector.
Features
• 8 Channels
• Wide supply connection – 11.0 to 28.0 Volts AC/DC
• Highly sensitive receiver input stage. When used with GLT27…. series transmitters and an ANT27L antenna, an operating range of 350 metres (980 ft) is possible.
• Eight open collector (GLR2708). All outputs can be operated simultaneously.
• Crystal controlled for high stability and performance.
• Dual Conversion to reduce interference.
• Uses micro-controller technology that can be re-programmed to suit unique applications.
• Momentary, flip-flop and latching output modes is user selectable.
Applications
• automatic gates, security, timer controlled outputs and simple on/off functions etc
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 Click image to enlarge
 Download Datasheet Programming Instructions
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Description
The GIGALINK™ is an advanced Remote Control technology available in the world today. GIGALINK™ is an invention that has revolutionised the entire Remote Control technology including Elsema's earlier version of FMT- … and FMR- … series. The GLR.... series state-of-the-art invention brings a new dimension in the world of Remote Control technology in domestic, commercial and industrial applications.
The innovative microcontroller technology replaces the traditional dip switch coding which eliminates any possible code grabbing. Special features such as over four billion code combinations, ability to program any number of transmitters to any of the receiver outputs, three user selectable modes, dual conversion superhet and operational over a wide voltage range all adds up to the most advanced and secure Remote Control available.
The microcontroller built-in code programming system automatically selects the programming mode that provides flexibility in programming each receiver channel to different transmitter channels. In programming mode the receiver sends a random code to program the transmitter channel(s). Momentary joining the two CC pins on the receiver board sets all eight channels to a random code. To program the receiver to the transmitter channel(s) follow the steps outlined in the receiver instructions.
Four billion codes
The user can easily change the code on all the channels. Momentary joining the two CC pins on the receiver board sets all channels to one random code. One of 4,294,967,296 possibilities is selected.
Code Programming
During single code programming, the 3-way dip switch selects the channel to be programmed. The table below shows the setting to select a different channel.
Dip Switch |
Programmed Channel
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1 |
2 |
3 |
OFF |
OFF |
OFF |
1 |
ON |
OFF |
OFF |
2 |
OFF |
ON |
OFF |
3 |
ON |
ON |
OFF |
4 |
OFF |
OFF |
ON |
5 |
ON |
OFF |
ON |
6 |
OFF |
ON |
ON |
7 |
ON |
ON |
ON |
8 |
After selecting the correct channel, the receiver channel is ready to be single code programmed. Follow the steps outlined in the receivers instruction sheet titled single code programming to complete the code programming.
If all the receiver channels are to be programmed onto a multi channel transmitter, then follow the steps outlined in the receivers instruction sheet titled channelised code programming. This does not require the user to set the 2-way dip switch since all receiver channels will be programmed sequentially onto the transmitters channels.
The receiver power must be connected when single or channelised code programming.
When programming is completed and the GIGALINK cable is removed from the multi channel receiver-coding socket, the 4-way dip switch is used to select different output modes. This is described below.
Different Modes for the Output
Modes are user selectable from the 4-way DIP-switch.
* Dipswitch 4 is reserved
AC/DC Supply and Antenna
AC/DC power supply and antenna is connected to the 3-way terminal block. Do not connect the supply to the 2.5-mm coding socket since connection may damage the microcontroller.
Channels
The eight channels are solid state outputs using the ULN2803 Integrated Circuit. This IC is inserted to a socket that enables the user to easily change the output stage in case of a damaged output. The ULN2803 IC is available from Elsema. Output 1 being at the left and output eight to the right of the terminal block.
Dual Crystal Control
The GLR2708 is crystal controlled using dual conversion. Dual conversion is where the received frequency is mixed twice, using a crystal at both mixing stages. This results in less interference, enabling the receiver to operate in noisy industrial applications, improves operating performance, which allows the receiver to pass EMC and stringent radio regulations around the world.
Unique Code System
The microcontroller EEPROM allows large volume users to have a unique code. This enables Elsema to offer everyone “your own” radio control.
Case
The GLR2708 is supplied without a case, this allows the receiver to be integrated according to your needs.
Products in the Range
Technical Data
| Supply Voltage |
10.0 to 28 V AC/DC. Absolute maximum DC 40 Volts
Can use Elsema 12-volt AC power pack (PP12)
Supply lines should be less than 3 metres long to comply with radio frequency authorities |
| Current Consumption |
11mA standby, 22mA if all outputs “On” |
| Receiver Type |
Dual Conversion Superheterodyne |
| Receiving Freq |
27.195MHz (Other freq available on 27.045, 27.145, & 27.455MHz. The 27.455 freq is not available for Australia) |
| Type of Crystal Used |
10.245MHz, Fundamental, 20pf, 30ppm
16.495MHz, Fundamental, 20pf, 30ppm |
| Operating Temperature Range |
-5 to 50°C |
| 1st IF Freq |
10.7MHz |
| 2nd IF Freq |
455kHz |
| Selectivity |
-6dB at ±5kHz
-20dB at ±6kHz |
| Image Rejection |
At 26.285MHz better than -60dB |
| Sensitivity |
1uV (for output to activate) |
| Type of Demodulation |
Narrow-bandwidth Frequency Modulation (FM) |
| Occupied Bandwidth |
Less than ±5kHz |
| Decoding System |
Microcontroller based 96-bit word |
| Code Combinations |
4,294,967,296 |
| Outputs |
Eight Open Collectors (See chart for Collector Currents)
Chart indicates that eight outputs can be ON simultaneously with each output collector current being 125mA. Outputs can hold 50 Volts in “Off” state |
| Relay Contacts |
N/A |
| Output Modes |
User selectable from DIP switch
1 |
2 |
3 |
Mode |
Description |
Off |
Off |
Off |
All Momentary |
Outputs on, only while correct signal is received. |
On |
Off |
Off |
All Flip- Flop |
Outputs alternate at every correct incoming signal. |
Off |
On |
Off |
Momentary and Flip-Flop |
Outputs 1 to 4 are momentary and 5 to 8 are flip-flop. |
On |
On |
Off |
Latching on |
Outputs will be on until supply to receiver is momentarily interrupted. |
Off |
Off |
On |
Momentary and Flip-Flop |
Outputs 1 to 6 are momentary and 7 to 8 are flip-flop |
On |
Off |
On |
Momentary and Flip-Flop |
Outputs 1 to 2 are momentary and 3 to 8 are flip-flop |
Off |
On |
On |
Momentary and Flip-Flop |
Outputs 1 to 3 are momentary and 4 to 8 are flip-flop |
On |
On |
On |
Latching and Momentary |
Output 1 is latching and 2 to 8 momentary |
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| Connections |
Supply, Antenna:
3-way screw type terminal block. |
| Eight Outputs: 9 -way screw type terminal block. (8 open collectors plus Ground) |
| Antenna |
50 ohms, 27MHz CB-Antenna or approximately 1m long & 1mm thick piece of wire |
| Dimensions |
96 x 70 x 15mm |
| Mounting Hole Size |
3.97mm or 5/32" |
| Mounting Hole Spacing |
Length 85mm
Width 60mm |
| Weight |
63g |
| Useable Transmitters |
All Elsema Type 27MHz GLT-... series |
| Useable Operating Range |
Up to 350m with proper 50 ohms, 27MHz CB-Antenna. Up to 200m with 1m long antenna wire. Antenna wire should be extended and away from metal. Ranges assume line-of-sight operation. |
Block Diagram
GLR2708
Application Notes (GLR2708)
Care should be taken with the solid-state outputs that they are protected from inductive loads. This is done by connecting diodes across your DC inductive load.
Inductive loads such as DC relays must be clamped with a diode across the relay coil. If this is not done the spikes generated by the DC relay will lock-up the receiver. When a lock-up occurs you will need to remove the power and re-connected it.
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