Input Expansion Unit - 20-03

The 20-03 is an I/O expander Module which provides four relay outputs,
plus eight open drain output pins which also serve as inputs.

The 20-03 outputs can be activated by Salcom Relay Protocol or other ASCII text over a serial connection.

Salcom Relay Protocol commands may be embedded in a POCSAG message received by a 20-90 transceiver, allowing activation of outputs by remote POCSAG transmitters.

Activation by POCSAG messages can be limited to a CAP code range, or
outputs can be triggered by any message sent to a CAP code within a range. Outputs may also be configured to respond to any specified text within the serial data.

Inputs on the 20-03 can generate Salcom protocol POCSAG messages over a serial connection which can be transmitted to a pager by a Salcom 20-90 transceiver or a Salcom 20-62 transmitter. Alternatively, inputs can be configured to send any ASCII text over the serial connection in response to an input change.

• I/O expander for the Salcom 20-62 transmitter or Salcom 20-90 transceiver
• Bidirectional Point-to-point control over serial or radio link
• Expandable further by daisy chaining Salcom 20-03 units
• Four relay outputs with normally open and normally closed contacts
• Eight bidirectional inputs generate user defined serial messages for rising and/or falling edges
• Compatible with Salcom message protocol
• Flexible output activation options
• Control over Ethernet using third party serial to ethernet adaptors
• Provides Input and Output capabilities for PC’s, PLC’s, and microcontroller projects
• Can generate regular watchdog messages to check serial and radio link integrity