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AY-K20C  

Multi Format Proximity Card Reader

 

 

INTRODUCTION & KEY FEATURES 

The AY-K20C Series Prox Readers are RFID proximity card readers 

to be installed for use with access control systems. This instruction 

manual contains information regarding the features, mounting, 
wiring, operating instructions and warranty details for the AY-K20C 

series readers. 

 

GENERAL FEATURES 

 

SelectableWiegand 26-Bit, Wiegand 37-Bit, or Seriel RS232 

 

Reads EM 4102 or Rosslare Format Cards 

 

Waterproof 

 

Green LED control line 

 

Red LED control line 

 

Buzzer control line 

 

Hold control line 

 

Optical tamper sensor 

 

Tamper output line 

 

UV Protected olycarbonate housing 

 

Mounting Template for quick installation 

 
 
 
 
 
 
 
 
 
 
 
 

MOUNTING INSTRUCTIONS 

 

To mount the Reader, perform the following: 

1.

 

Determine an appropriate mounting position for the Reader. 

2.

 

 Peel off the back of the self-stick mounting label template 

included with the unit and place at the desired mounting 

position. 

3.

 

Using the template as a guide, drill two holes (hole size is 

4.

 

indicated on mounting template) for mounting the Reader 

to the surface. 

5.

 

Drill a 7/16" (10mm) hole for the cable. If mounting on metal, 
place a grommet or electrical tape around the edge of the 

hole. 

6.

 

Route the interface cable from the Reader to the Controller. 

A linear type power supply is recommended. 

Note: The prox reader can also be mounted using epoxy glue. 
After application, the reader should be firmly held in place 
until the glue dries. 
Note: Card Readers are to be used with control panels whose power 
supply is UL Listed Class 2 or equivalent. 

WIRING INSTRUCTIONS 

The Prox Reader is supplied with an 18-inch pigtail, having a 6-

conductor cable. To connect the Reader to the Controller, 

perform the following steps: 

1.

 

Prepare the Reader cable by cutting the cable jacket back 
1 inches and strip the wires inch. 

2.

 

Prepare the Controller cable by cutting the cable jacket 

back 1 inches and strip the wires inch. 

3.

 

Splice the Reader pigtail wires to the corresponding 
Controller wires and cover each connection (see Figure 2). 

4.

 

If the tamper output is being utilized, connect the purple 

wire to the correct input on the Controller. 

5.

 

Trim and cover all conductors that are not used.  

 

 

 

 
 

 

 

 
 

WIRE COLOR 

WIEGAND 26-

BIT OUTPUT 
MODE 

WIEGAND 37-

BIT OUTPUT 
MODE 

SERIEL 

(RS232) 
OUTPUT 

MODE 

Red +DC +DC +DC 

Black  Ground Ground Ground 

Green Data 

0  Data  RS232 

White Data 

1 Clock 

Orange 

Green LED 

Green LED 

Green LED 

Brown 

Red LED 

Red LED 

Red LED 

Yellow  Buzzer Buzzer Buzzer 

Blue Hold Hold Hold 

Purple  Tamper Tamper Tamper 

Grey Connected 

to GND 

Open Input 

Connect to 

+DC 

OPERATION INSTRUCTIONS 

TESTING THE READER AND CARD READING 

The Reader should be tested after wiring it to a power supply and 

the Controller. Do this by performing the following steps: 
1.

 

Power up the Reader. The LED and Beeper will activate one 

time. This indicates that the Reader is working properly. 

2.

 

Present the appropriate type of proximity card to the 

Reader. The LED will momentarily flash green and a short 
beep will be emitted. This indicates that the card was read 

properly by the Prox Reader. 

3.

 

After the card data is processed by the Controller, the 

Controller can then turn the LED green. Refer to the 
Controller description of the LED operation if the Reader LED 

is controlled by the Controller. 

OUTPUT SELECTION 

ForWiegand 26-bit operation the grey wire should be connected 
to the ground, for Wiegand 37-Bit operation the grey wire should 

be held not connected, for Serial RS232 operation the grey wire 

should be held to +DC (VIN). 

LED CONTROL 

If the LED control wires (orange and brown) are not used (open) 
the reader LED will remain red continuously and when successfully 

reading a card the reader will flash the LED green momentarily. 

The Bi-Color LED color can be controlled using the orange and 

brown wires. When the orange wire is held to ground the LED will 
be green; when the brown wire is held to ground the LED will be 

red; when both the brown and orange wires are held to ground 

the LED will be amber. 

BUZZER CONTROL 

If the buzzer control wire (yellow) is not used (open) the buzzer will 

beep only when a card is read successfully. The buzzer can also 

be controlled using the yellow wire. When the yellow wire is held 

to ground the buzzer will sound. 

HOLD CONTROL 

The reading of cards can be disabled using the hold wire (blue). If 

the blue wire is held to ground the reader will ignore all cards 

placed in its field. If the blue wire is open the reader will read 

cards normally. 

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