IM-16 Hardware

The Vocia Interface Module 16 (IM-16) is designed to supplement the Vocia LSI-16. The IM-16 offers an additional sixteen Control Inputs which can be configured in the Vocia software as Alarm, Fault or Reset inputs. An LSI-16e contains an IM-16 module by default.

All software configuration of the IM-16 is performed with the LSI-16 Dialog Windows.

Please review the IM-16 input wiring section to review supported wiring and interfacing.

Please refer to the IM-16 Manual for more details.

IM-16 Pin Outs

IM-16 pinouts on life safety interface 16 rear panel

Pin	Option A Function	Option B Function
1	Chassis Ground / Shield	Chassis Ground / Shield
2	Control Input 1	Control Input 9
3	Control Input 2	Control Input 10
4	Isolated Ground	Isolated Ground
5	Control Input 3	Control Input 11
6	Control Input 4	Control Input 12
7	Isolated Ground	Isolated Ground
8	Control Input 5	Control Input 13
9	Control Input 6	Control Input 14
10	Isolated Ground	Isolated Ground
11	Control Input 7	Control Input 15
12	Control Input 8	Control Input 16
13	Isolated Ground	Isolated Ground
14	24V (60mA total across all inputs in Option slot A & B)	24V (60mA total across all inputs in Option slot A & B)

IM-16 Pinout Table

Connections and Input Types

External Connections

Both Chassis Ground () and Isolated Ground () are provided on the IM-16 connectors.

By default, all input circuits should be isolated with respect to the ground. Any external input connections must be logic referenced to the Isolated Ground. This configuration allows external equipment to be interconnected to the LSI-16 without ground current interaction between devices.

The IM-16 Chassis ground appears on a single terminal (Pin 1) on each of the two connector banks (‘Option A’ and ‘Option B’). This should only be used if circuit isolation is not required and should only be connected to the cable screen.

For ease of wiring each connector, every Control Input pair has an Isolated Ground connection adjacent to it however the Isolated grounds are all connected internally so any could be used.

Types of Input Circuit

The logic level of each input may be independently determined in the Vocia software to operate one of three ways. These are;

TTL (2v to 5v logic sense) - To enable a TTL input, apply a TTL logic high with respect to Isolated Ground. This can be configured in Software to reference 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 reference 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, open circuit or over-voltage. 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 IM-16 will sense open circuits on the line between its input and the terminating resistor. A 6k8Ω resistor should be used. 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. This is fixed in software to reference a low to high transition (to enable the monitoring circuit).
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 review the IM-16 Wiring Inputs section for physical wiring details.

Sourcing 24v DC for High Range Inputs

The High Range logic inputs should be driven from a contact closure (relay or switch) in connected equipment The High range inputs expect to sense a voltage of 24V DC. A 24V Logic High Reference output voltage is provided by the IM-16 for this purpose.

Alternatively an external 24V reference may be used. If an external supply is used, the ground connection must be wired to the IM-16 Isolated Ground.