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Biamp Systems

CI-1 wiring guide

The CI-1 Control Interface is a companion product to the Vocia® LSI-16 Life Safety Interface. It facilitates the necessary connections to the LSI-16 for standards compliance.

The CI-1 requires 2 x 24VDC 15W power connections. Biamp offers a 24VDC 30W inline power supply which is appropriate for use with the CI-1. The power supply supports 100-240VAC to 24VDC and has a 5-pin Phoenix style connector included. The power supply part number is 283.0119.90A. An IEC plug to local wall power cable is also needed for the power supply - in North America the part number is 330.0002.900 (this cable part number will differ for other countries).

All logic input and output connections of the LSI-16 are permanently monitored for open or short circuit. The CI-1 carries most of the necessary terminating resistors to ensure normal operation of the LSI-16, without the need of external cabling. However, some logic connectors are not terminated internally, in order to provide monitored connectivity between the CI-1 and the fire panel or building management system.

This article explains how to terminate the remaining monitored connectors of the CI-1 to get a Vocia system into final operational state.

I/O Connections to be terminated

If there are any monitored logic input or output connections on the CI-1 that are not used, a termination resistor must be installed on them to prevent the Vocia system from indicating a fault. Termination of any input or output is only necessary if they remain unused and won't be connected to any third-party equipment:

  • Any output connected to a relay doesn't require terminating resistors.
  • Any input connected to a digital or open collector output, doesn't require terminating resistors.
  • Any input connected to a voltage-free contact will require a terminating resistor, placed nearby the actual contact.


The following logic outputs require an external resistor (22 kOhm) connected to 24V reference voltage:

  • VA = Voice Alarm Active Output
  • GF = General Fault Output


The following logic inputs require an external resistor (2.2 kOhm) connected to 24V reference voltage:

  • U = UPS Fault Input
  • P = PSU Fault Input
  • W = EWS PSU Fault Input​

CI-1 without termination

By default, the CI-1 comes with all necessary cabling for interconnecting the LSI-16. This is a rear view on an LSI-16 and a CI-1 connected with the supplied interconnection kit:

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LSI-16 and CI-1 interconnected with supplied accessories


Left in an "out of the box" state, when no additional termination to the CI-1 has been applied, the LSI-16 will report multiple faults in Vocia Software, as seen under LSI-16 > Configuration > Alarms & Logs:

Faults.JPG

LSI-16 Alarms & Logs without terminating resistors

CI-1 with termination resistors

As mentioned above, there are five I/O pins at the CI-1 that require for external terminating resistors if those pins are not wired to an external device. All of these resistors can be connected to the +24V reference voltage, provided by the CI-1 itself:

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Connecting scheme for required resistors, assuming all five ports are unused

Applied to the actual CI-1 hardware, the finished wiring of the circuit would look similar to the following example:

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Termination resistors installed on a CI-1

With all resistors in place and a 24V backup power source being connected to the CI-1, the software will now clear all faults at the LSI-16 Alarms & Logs section, as long as no other emergency device within the same World is in a fault state.

Further reading

More information on interfacing logic inputs and outputs with third-party emergency equipment can be found here:

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