Tuesday, 30 April 2013

Grandview Motorised Projector Lift Control Info

Grandview GPCK-MB1000B Motorised Projector Lift Specifications  

 This lift can be controlled via RS485 or relay. The pinouts are shown on the graphic below.

Baud Rate: 2400 kps - Data Bits; 8, Start Bits: 1, Stop Bits: 1

The default RS485 HEX Commands are as follows:

Command for UP -       0xFF 0xEE 0xEE 0xEE 0xC9
Command for DOWN -  0xFF 0xEE 0xEE 0xEE 0xE9
Command for STOP -    0xFF 0xEE 0xEE 0xEE 0xCC

Multiple lifts can be connected on a single RS485 line/bus.

If this is done then each lift needs to have a unique address.

When power cycling the lift, for the first 10 seconds the lift will be in address learning mode.

Use the following command to set the address:

0xFF 0x** 0x** 0x** 0xAA, where ** will be your new address. 

IE: 0xFF 0x01 0xEF 0x02 0xAA

Thereafter all commands need to be changed with the new address. 

IE: Command for UP -       0xFF 0x01 0xEF 0x02 0xC9

Tuesday, 2 April 2013

Optoma Adds Two EcoBright SSI Short-Throw Projectors

2500 lumen, lamp free projectors.....very interesting. Light source is rated to 20,000 hours. 

Looks like the brightness of these solid state illumination projectors is getting to the more acceptable levels. 

The issue at present will be price. looks like these units will be around 5 times the price of their lamp-type counterparts.

Lamp prices have dropped dramatically over the last few years, so comparing price versus lamp life, will show that the lamp-type projector with a 4000 hour rated lamp life, will need 4 additional lamps to the one SSI projector.

A Lamp-type projector and 4 additional lamps will work out to a very similar type pricing to the SSI models. 

At present the difference would be the reduced carbon footprint of the SSI projector and if you trust the specified 20,000 hour spec.