Input circuit wiring – Keri Systems EP1501 User Manual

Page 6

EP1501

DOC 10107-0036

REV 1.07

Page 6

Reader Port 1 - OSDP Protocol Devices (2-Wire RS-485)

8. Input Circuit Wiring:

Typically, these inputs are used to monitor door position, request to exit, or alarm contacts. Input circuits
can be configured as unsupervised or supervised. When unsupervised, reporting consists of only the
open or closed states.

When configured as supervised, the input circuit will report not only open and closed, but also open
circuit, shorted, grounded*, and foreign voltage*. A supervised input circuit requires two resistors be
added to the circuit to facilitate proper reporting. The standard supervised circuit requires 1k ohm, 1%
resistors and should be located as close to the sensor as possible. Custom end of line (EOL)
resistances may be configured via the host software.

* Grounded and foreign voltage states are not a requirement of UL 294 and therefore not verified by UL.

The input circuit wiring configurations shown are supported but may not be typical:

VO (12 Vdc)

GND

DAT

CLK

OSDP PROTOCOL DEVICE

9600 BAUD

ADDRESS 0

BZR

GND

VIN

DAT/D0

CLK/D1

LED

BZR

OSDP PROTOCOL DEVICE
ADDRESS 1
9600 BAUD

REFER TO THE APPROPRIATE REMOTE SERIAL I/O DEVICE INSTALLATION MANUAL FOR ADDRESS

AND BAUD RATE SETTINGS. DO NOT TERMINATE ANY OF THE DEVICES ON THE RS-485 MULTI-DROP
COMMUNICATION BUS. EACH OSDP DEVICE MUST BE CONFIGURED WITH AN UNIQUE
COMMUNICATION ADDRESS. A MAXIMUM OF TWO OSDP DEVICES MAY BE CONNECTED TO READER

PORT 1.

(DEFAULT)

TB4

TB3

TB2

FIRST READER PORT

TR+

TR-

FIRST READER PORT

1K,1%

Standard Supervised Circuit,
Normally Closed Contact

Standard Supervised Circuit,

Normally Open Contact

Unsupervised Circuit,
Normally Open Contact

Unsupervised Circuit,
Normally Closed Contact

IN2

IN1

TB
1

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