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J22 Power Input:
J23, J24 Communi-
cation inputs:
Relay Outputs 1-4:
SHDN jumper
EOL Resistors 1-4:
Power Connections
The 301C requires a power range of 17-27 Vac, 50/60 Hz (8.64 VA),
18-36 Vdc, 350 mA @24 Vdc (8.4 VA). Polarization is not important in
either AC or DC mode. The system must be grounded on the
transformer and a dedicated circuit breaker must be used.
Communication Connections
Communication cables must be grounded using the shield terminal,
using twisted and shielded pair Belden 2-24 AWG #9841 cable (or
equivalent).
The network cabling can extend up to a limit of 2000 feet (609 m) per
channel.
The length of a T-tap can reach 65 feet (20 m), up to a maximum of
130 feet (40 m) for all T-taps.
The 301C controller communicates with gas sensors over a Modbus
RS-485 network. This transmission line requires that 120Ω termination
resistors be fitted at both ends of each network segment to absorb the
Connect the power supply to the controller
(see Wiring Details for cabling diagrams)
Connect communication cables to channels 1
through 3.
Depending on the desired configuration,
connect the relay cables to either N.O. or N.C.
Relays 1 and 2 are commandable by either
internal events or by BACnet; relays 3 and 4
are driven only by internal events.
Place the jumper over the Shutdown header
pins to reset or restart the system.
Place the jumper over the header pins to
include resistors to attenuate communication
echoes.
13
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