How to wire Power, Grounding, EIA-485, and Ethernet

Power and Grounding (ESCU / Net DCD-n and EDCD)

The PS1 Power Supply includes a line conditioner for the EIA-485 (RS-485) chain that is important to get optimal distance and baud rate for the EDCDs.

The ESCU / Net DCD-n and EDCDs must share standard Power GNDs.

If the number of devices connected to the power supply is ten or fewer, may use a smaller cable.

Local electrical codes may require plenum-rated cable or conduit.

Always check local codes before running any cable.

For UL Listed systems, the power supply shall wire through a conduit.

EIA-485 (RS-485) (ESCU and EDCD)

The ESCU and EDCD use Half Duplex EIA-485 (RS-485). Connect to J1, as shown in Figure 3-2. Use shielded twisted pair cable with the shield grounded to chassis ground at one end only. (Recommended to use equivalent to Belden 3106A.

 

The ESCU / Net DCD-n and EDCDs must share common EIA-485 GNDs.

EIA-485 Specifications

The maximum Speed, Cable Length, and Number of EIA-485 nodes are dependent upon each other and

many other factors.

less than 5-10 feet, preferably about 3 feet. More extended stubs will attenuate the signals if the node’s connection point (stub) is excessively long. A long stub causes a significant impedance mismatch and signal reflections. Should keep all stubs as short as possible.

  • The maximum cable length is 4000 feet (1200 M).

 The baud rate is a function of the quality of the EIA-485 (RS-485) wiring:

  • Distance
  • Cable type (twisted pair, shielded)
  • Wire gauge
  • Number of T-taps
  • Number of EDCDs.

 Possible need for termination. A termination resistor of 120 ohms on each end across the Data+ and Data- pins on long cable runs can improve the signal distortion.

Ethernet (ESCU and Net DCD-n Only)

Network Adapter in J13 supports:

  • 10/100 bits/sec. Use minimum CAT 5, CAT 5E preferred.
  • Auto Speed detect
  • Auto Crossover detect
  • Half duplex.
  • Yellow LED indicates Carrier connection. No communication will occur unless the YEL LED is lit.
  • Green LED indicates TCP/IP activity over Ethernet.

ESCU, EDCD, and Net DCD-n Install Guide 3–5

How to Wire Readers, Inputs, Outputs

This section describes how to wire the following supported Reader interfaces:

 Wiegand Signaling (Data 1 and Data 0)

 Magnetic ABA Signaling (Clock and Data)

 MARLOK Signaling (Clock with two Data tracks)

Readers - Wiegand signaling

J6 has the Power, Data One, and Data Zero signals. Power can be either 12VDC or 5VDC. For UL compliance, the recorded range for compatibility on the outputs is 5 – 13VDC.

J1 has Red and Green LED drives. (GND when true)

J7 provides for the REX input if required.

Readers - Magnetic signaling (ABA Track 2)

  • J6 has the Power, Clock, and Data signals. Power can be either 12 VDC or 5 VDC. Reader Power has PTC short circuit protection at 200mA.
  • J1 has Red and Green LED drives. (GND when true)
  • J7 provides for the REX input if required.

Readers - MARLOK Signaling

UL DID NOT EVALUATE the MARLOK wiring setup and shall not be enabled in a UL 294 compliant system.

J6 has the Clock and Data signals.

J5 has Power (MAR VSOL), the VSOL signal and the Green MAR VLED drive.

Connect access control System reader device to Door Control Device (DCD) board.

Use six-conductor Leader Cable, supplied by Millennium access control Group for Keyloks and Keyreaders (unshielded).

May also use the unshielded Millennium access control Group leader cable with specific Wiegand devices and card readers that do not require SHIELDED cable.

Recommended cable length for Keyreaders and Keyloks is 15 feet–maximum.

Length MUST NOT exceed 35 feet. To avoid interference at this higher limit, must run the cable. Separately—not bundled with other wires.

Inputs

  • Inputs 1 through 4 are supervising with 1K ohm resistors, a
  • Inputs 5, 6, and 7 are non-supervised, Normally Closed circuits. Input 7 is used for the Door State Monitor (DSM) and can use inputs 5 or 6 for a UPS battery low signal. There is a particular input for the External Tamper. Use any one of the GND Returns for the External Tamper Return.

Relays (Outputs)

J2 and J3 provide the Common (C), Normally Closed (NC), and Normally Open (NO) pins for the two relays.

These Dry relays (Dry = requires external power) are typically used for the Door Latch and possibly an

automatic door opener.

For UL 294compliance, the relays are to be loaded to a maximum of 24VDC, 4 Amps. (Suitable for inductive loads.)

Relays are rated at 10 Amps with PTC thermistor over current protection at 4 Amps.

Use the Suppression Kit supplied with EDCDs to provide strike protection.

Install a diode across the door lock if the power supply is DC to suppress the energy surge. The cathode must be on the positive side of the strike.

If the power supply is AC, install a varistor across the door electric strike.

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