Instructions

39. WIEGAND OUTPUT FORMATS

The Timing and Electrical Manner of The Wiegand Data Output

Wiegand is a common medium in the communication between readers and controller in access control. The Wiegand

data from the keypad unit provides a level of compatibility for readers and controller that can be used by consultants

in custom project development.

The Wiegand interface uses three wires, one of which is a Common Ground and two of which are data transmission

wires called DATA 0 and DATA 1. When no data is being sent both DATA 0 and DATA 1 are at high voltage. When a

“0” is sent the DATA 0 is at low voltage while the DATA 1 stays at a high voltage. When a “1” is sent DATA 1 is at the

low voltage while DATA 0 stays at the high voltage.

The high voltage level in the keypad unit is +5VDC to accommodate for long cable runs (approximate 500 feet) from

it to the associated controller typically located in a secure closet.

0 1 0 1

+5V

Data 0 Line

Data 1 Line

2 mS pulse interval

50 uS pulse

Wiegand Data 26-Bit, 34-Bit or 37-Bit Selection

The Wiegand data output is programmable to 26-bit, 34-bit or 37-bit standard format for EM Cards and user codes

on LOCATION 93.

26-Bit Wiegand Data Output

Bit 1: Even Parity Bit (bit 2 – bit 13)

Bit 2 – Bit 25: 24 Bit ID Number

Bit 26: Odd Parity Bit (bit 14 – bit 25)

34-Bit Wiegand Data Output

Bit 1: Even Parity Bit (bit 2 – bit 17)

Bit 2 – Bit 33: 32 Bit ID Number

Bit 34: Odd Parity Bit (bit 18 – bit 33)

37-Bit Wiegand Data Output

Bit 1: Even Parity Bit (bit 2 – bit 19)

Bit 2 – Bit 36: 35 Bit ID Number

Bit 37: Odd Parity Bit (bit 19 – bit 36)