Zeta Alarm Systems.
ZNDC Installation and Operation Manual
Revision 1.0
Part # MAN-ZNDC-01
Page 3
2. Specifications
2.1 Electrical Specifications
All circuits are supervised and Power Limited.* Zeta Alarm Systems requires that the ZNDC be
mounted inside one of our UL listed enclosures, and be powered from an IPB-3 (Inline Power
Booster), Sigma Mk II or Classic 2000 Mk II continuous 24VDC output.
Power Requirements:
Voltage:
24VDC (22-28VDC)
Current:
Nominal
Max
56mA
76mA
Network: RS-485, 9600 baud (Sigma Mk II) or 19200 baud (Classic 2000 Mk II)
*Note: Phone lines are supervised but not power limited.
2.2 Wiring Specifications
2.2.1 Electrical Wiring
Please adhere to the following guidelines for wiring the ZNDC:
Recommended Wire Type: 14 – 22 AWG shielded, twisted-pair
Maximum Cable Length: 8000 ft. (@16 AWG) ***See Note***
Maximum Total Cable Resistance: 50
Ω
. ***See Note***
Maximum Cable Capacitance: 0.3
µ
F. ***See Note***
Wiring should not cross or rest on the circuit board.
Note: The above cable length is actually the maximum length for the RS485 Network com-
ing off the Classic 2000 Mk II or Sigma Mk II Control Panels, and thus would apply to the
ZNDC only if it is the last device on the network, and no other devices were attached.
The most important thing to remember when wiring a device is to make sure that the cable
does not exceed maximum capacitance and resistance. The levels of capacitance and
resistance can be affected by the gauge and the quality of the cable being used. Cable will
be specified by the manufacturer according to capacitance and resistance per foot. To
accurately figure cable length, divide the Maximum Capacitance by the cable’s Capaci-
tance-Per-Foot. This will give you the maximum length of cable you can use before you
exceed the Maximum Capacitance. (Likewise with resistance.)
2.2.2 Telephone Wiring
Use 4-pair, straight through, standard telephone cabling. RJ45 connectors are supplied in the
installation kit. See section 3.5 for wiring diagram.
2.3 Environmental Specifications
To prevent water damage, please observe the following restrictions when mounting the ZNDC:
Do not mount directly on exterior walls, especially masonry walls, due to condensation.
Do not mount directly on exterior walls below grade due to condensation.
Indoor use only.
Protect from plumbing leaks.
