Wireless Contact Closure Detection
Communicate Through a Modem on Your Computer
Monitor and Read Contact Closure Inputs Using a Computer
Monitor Inputs, Trigger Relays for Full Contact Closure Control
Wireless Contact Closure Monitoring
With this Scan Series Controller you can monitor Contact Closure Inputs using a computer. With minimal programming, data collection and control from a single controller allows any computer to talk this device from a modem connected to the USB port of your computer. The SCAN Series command set allows you to read anywhere from 1 to 32 banks of 8 inputs in a single query. A single bank contains 8 inputs. Reading 32 banks will report the status of 256 inputs. It doesn't stop there, because we are focused on relay control you can add relays to the board (up to 256) and control them using the data collected from the inputs. Remember these are contact closure inputs ONLY no voltage can be applied to these inputs.
About 802.15.4 Wireless
802.15.4 is not one of the most widely known wireless technologies but it is easy to setup and use, and vey reliable. You will need a 802.15.4 modem that plugs into your USB port of your computer to talk any number of 802.15.4 relays with a standard range of 300' and up to 1 mile. You can choose the distance of the module installed at checkout.!
802.15.4 Wireless Modules
This board is equipped with a 802.15.4 Module. The 802.15.4 communications module adds wireless communications to the board. The 802.15.4 module is powered from the board. The board itself will require 12 volts of power and can be hard wired or you can purchase a "wall wart" type transformer at checkout. Click the following link for a spec sheet on the XBeeŽ Multipoint RF Modules.
As with any wireless technologies, for optimal performance it needs to be line-of-sight. In other words the antennas of the board and modem must "see" each other to get the optimal range or even be able to communicate at all. Select the External Antenna option to provide better range especially when controller will be mounted in an enclosure or behind a wall or obstruction.
External Antenna Options
The External Antenna option is available with the 300' and 1-mile range modules and has a short pig tail that connects to a button on the 802.15.4 external module. Extension cables can be purchased. The connector type is RP-SMA (Reverse Polarity SMA). You will need a cable with RP-SMA Male and RP-SMA Female connectors. We do not stock these cables or recommend any specific cable. Antenna extension cables will reduce signal strength and are generally not recommended over 20 feet, though individual results will vary. Please note that the internal antenna modules (shown above) have antennas that are about an inch long and integrated into the module therefore the external antenna cannot be used on an internal antenna module or added after purchase. Prices shown are with the 300' internal antenna option, external antenna options are available at checkout.
802.15.4 Wireless Modem
Plug the XBP24-AUI-EXT_ZIGMO modem into the USB Port of your computer. The modem will mount as a COM port on your PC. Open the COM port and start sending data to the modem. The modem will forward your data to all Wireless 802.15.4 compliant devices within range (it is also possible to speak to a specific device when other controllers are in range). Mounting slots on the modem make it easy to attach to a wall to allow for line-of-site operation. The modem is also available at checkout.
Sending Commands Base Station Software is available at no charge to get you up and running fast (more on Base Station below). Once powered up, the controller waits for a ProXR command. A command consists of a few bytes of data in numerical format (ProXR Enhanced Command Set) usually between 2 and 6 bytes. Once the command has been received, the controller processes the command, and sends you back ASCII character code 85 to signal the completion of your command. When a command was sent to read the status of the contact closure the status is sent back.