User's Manual

E2 Wireless I/O Page 9
Pulse inputs counts are accumulated and the total count is transmitted regularly
according to the configured update time.
The E2 modules transmit the input/output data using radio or Ethernet. The data frame
includes the "address" of the transmitting module and the receiving module, so that
each transmitted message is acted on only by the correct receiving unit. Each message
includes error checking to ensure that no corruption of the data frame has occurred due
to noise or interference. The module with the correct receiving "address" will
acknowledge the message with a return transmission (acknowledgement). If the original
module does not receive a correct acknowledgement, it will retry up to five times before
setting the communications fail status of that path. In critical paths, this status can be
reflected on an output on the module for alert purposes. The module will continue to try
to establish communications and retry, each time an update or change-of-state occurs.
A system can be a complex network or a simple pair of modules. An easy-to-use
configuration procedure allows the user to specify any output destination for each input.
Two versions of the E2 are available. The Legacy version provides for operation with
existing ELPRO wireless I/O devices (905 series and 105 series modules) The second
version provides enhanced features, including IP addressing, allowing thousands of
modules to exist in a system, and allowing Automatic routing of messages through
repeater stations.
Each E2 radio in a system may have up to 24 expansion I/O modules (ELPRO 115S)
connected by RS485 twisted pair. Any input signal at any module may be configured to
appear at any output on any module in the entire system.
Modules can be used as repeaters to re-transmit messages on to the destination
module. Repeaters can repeat messages on the radio channel or from the radio
channel to the serial channel (and serial to radio). Using Legacy protocol, up to five
repeater addresses may be configured for each input-to-output link. The meshing
protocol will automatically select other stations to act as repeaters as required.
The units may be configured by using a web browser connected to the Ethernet port or
using supplied system configuration software connected to the Module’s USB port. The
default configuration and software configuration is defined in Section 4 Configuration.