February, 2018
eMAX-EP4502 - Manual
Page 7 of 11
7. Reader Wiring:
Each reader port supports Wiegand, magnetic stripe, and 2-wire RS-485 electrical interfaces. Power to the
reader is selectable: 12 Vdc (VIN must be greater than 20 Vdc), or power is passed-through (PASS) from the
input voltage of the eMAX-EP4502 (TB1-VIN) and is current limited to 180 mA for each reader port. Readers
that require different voltage or have high current requirements should be powered separately. Refer to the
reader manufacturer specifications for cabling requirements. In the 2-wire LED mode, the Buzzer output is
used to drive the second LED. Reader port configuration is set via the host software.
Data1/Data0 - Clock/Data
Reader
2-wire RS-485
Device
8. Input Circuit Wiring:
There are eight (8) inputs that are typically used to monitor door position, request to exit sensors or alarm
contacts. Input circuits can be configured as:
•
Unsupervised alarm (2 states); reporting as open or closed contact.
•
Supervised alarm (6 states); reporting as open or closed contact, open circuit, shorted circuit, grounded
circuit *, or foreign voltage*.
A supervised input circuit requires adding two resistors with value of 1k ohm, 1% to the circuit to facilitate proper
reporting 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.
GND
DAT/D0
CLK/D1
BZR
LED
VO
TB8 OR TB9
POWER
TR+ (B)
TR- (A)
GND
GND
DAT/D0
CLK/D1
VO
TB8 OR TB9
GND
DAT/D0
CLK/D1
BUZZER
LED
POWER
1K,1%
1K,1%
1K,1%
1K,1%
Standard Supervised Circuit,
Normally Closed Contact
Standard Supervised Circuit,
Normally Open Contact
Unsupervised Circuit,
Normally Open Contact
Unsupervised Circuit,
Normally Closed Contact
Terminal Blocks
TB4 Through TB7
