GPIO-1 Hardware

This section is provided to aid in the use of the GPIO-1. Please see the GPIO-1 Manual for further information on installation of the device.

The GPIO-1 provides sixteen general purpose logic inputs and sixteen general purpose outputs to control various aspects the system. The GPIO-1 is a monitored device and can be used in life safety applications where more logic inputs or outputs are required. Please review the Control Input Events and Control Output Events section for more details.

Network and Power Connection

The GPIO-1 has two RJ-45 connectors located on the rear panel that enable redundant network wiring.

Left LED	Right LED	Description
None	None	No power or data connectivity. Please check the Device power and network connection.
Amber	Flashing Green	Link established and CobraNet activity detected; the unit is acting as a CobraNet performer.
Flashing Amber	Flashing Green	Link established and CobraNet activity detected; the unit is operating as a CobraNet conductor.
Off	Flashing Green	Failover connection standing by in case the Primary connection fails. By default will be the right Hand socket (Secondary).
Flashing Amber	None	CobraNet fault. Check cabling and configuration for errors.

A green power LED is provided which illuminates when PoE power is applied to the unit via the Network ports. The same goes for the Aux Power input indicator. If PoE Power is required an 802.3at Type 1, Class 3, compliant PoE switch or mid-span adapter is required to either or both network inputs.

The Vocia GPIO-1 is capable of operation from two power supply types - PoE and 24VDC. Any or all power sources may be connected concurrently. Loss or return of any power supply will not result in interruption to normal operation. Monitoring of all power sources is selectable via the Vocia Software in the GPIO-1 Options dialog. If connected PoE has priority over 24V DC.

The GPIO-1 uses comprehensive self-monitoring and is capable reporting any detected faults to the system. Refer to the Alarm & Logs section for further information.

Input Connectors

Sixteen parallel input connections are provided on the GPIO-1 as well as Isolated Ground and Chassis Ground connections. Under software control the logic level of each input can be set independently to operate in the following ways;

TTL: 2V to 5V logic sense. To enable a TTL input, apply a TTL logic high or low with respect to Isolated Ground. This can be configured in software to detect a low to high or high to low transition.
High Range: To enable a High Range input, use a dry contact to switch the input to a voltage of 24V DC with respect to Isolated Ground. This can be configured in software to detect a low to high or high to low transition.
High Range – Monitored: This circuit is implemented in the same way as the High Range input. This option allows monitoring of each input for short to ground and open circuit. In order to sense open circuit, a terminating resistor must be fitted between each Control Input and Isolated Ground at the far end of the input circuit being sensed. The Inputs will sense open circuits on the line between its input and the terminating resistor. Shorts to Isolated Ground are sensed across the entire line being monitored. A 6k8Ω resistor should be used for each input. If a monitoring fault is detected on any input the logic state or transitions on that input will be ignored until the fault is cleared. High Range – Monitored inputs require a low to high transition to enable the input (transition direction not configurable).
Contact Closure - This selection allows the inputs to be asserted without a monitoring resistor or voltage. Line monitoring of a Contact Closure input is not possible.

Please refer to the Wiring GPIO-1 Inputs section for wiring schematics.

Output Connectors

Sixteen parallel outputs are provided on the GPIO-1 as well as Isolated and Chassis Ground connections. Each output is able to accept either an external positive voltage between 4 and 30V or use the 24V DC 100mA reference voltage provided on the unit. Outputs will be monitored for open circuit, short to ground and short to supply. A Voltage Monitor (VM) input is provided in order that a short to supply reference voltage is incorporated in output fault monitoring. A voltage of between 4-30V is required by the VM Input in order for the Outputs to operate. If the GPIO-1 Outputs are using a Monitored type of circuit the VM input must match or be greater than the highest Output Voltage being used. If a higher Voltage is seen on the Outputs compared to the VM Input a Short to Supply fault will be indicated.

Please refer to the Wiring GPIO-1 Outputs section for wiring schematics.