12
INPUT
OUTPUT
Relay 1 Input (C)
Relay 1 COM, Relay 1 N.C., Relay 1 N.O. (R)
Relay 2 Input (C)
Relay 2 COM, Relay 2 N.C., Relay 2 N.O. (R)
Relay 3 Input (R)
Relay 3 COM, Relay 3 N.C., Relay 3 N.O. (C)
Relay 4 Input (R)
Relay 4 COM, Relay 4 N.C., Relay 4 N.O. (C)
LED Input (C)
LED Output (R)
Aux Input (R)
Aux Output (C)
The Cypress SPX-7500 provides additional data channels to support access control hardware such as door strikes,
tamper alarms, request to exit status, etc. These signals are sent to and from the Central and Remote units without the
need to run additional wiring. We refer to these data channels as Accessory I/O. Accessory I/O data channels include
Relay 1, Relay 2, Relay 3, Relay 4, LED, and AUX. Refer to the following pages (14-21) for details of each Accessory I/O
operation and connection. Below is a table of the Accessory I/O pairs.
Relay I/O
The Relay I/O use active low inputs. When the Relay Inputs are floating (nothing connected) the inputs are set at 5V and
the corresponding Relay Outputs will have continuity between COM and N.C. When the Relay Input is set to 0Volts
(Ground) the input will activate the corresponding Relay Output. The Relay Outputs will have continuity between COM
and N.O. when the relay is activated and will hold this state for as long as the Relay Input is set to 0Volts. The Relay
Inputs can be tested by making a jumper connection to ground and monitoring the change in continuity of the Relay
Outputs.
Relay 3 functions as an Supervision relay when DIP switch 4 is on in Run Mode; a Supervision relay monitors the
condition of the communication link between the Central and Remote units. While in Supervision mode, Relay 3 is
activated when the communication link between the Central and Remote is established and functioning. Relay 3 will
deactivate(Alarm condition) when either the Relay 3 Input on the remote is active (pulled low) OR the Remote unit is
unable to communicate with the Central unit. See APPLICATION NOTE FOR DETAILS.
LED and AUX I/O
The LED and AUX I/O use active low inputs. When the inputs are floating (nothing connected) the associated output will
be set to a high level (5V). When the input is set to 0Volts (Ground) the input will activate its associated output. All
Accessory outputs are Open Collector type and will switch to Ground when activated and will hold this state as long as
the input is set to 0Volts. Each input will have an associated output. Inputs can be tested by making a jumper connection
to ground and monitoring the associated output.
Cypress Suprex® RS-485 Series - Accessory I/O - Overview
Accessory I/O Pairs
(C) or (R) denotes which board the pin is located on.
