2
Power 24 Vac ±10% (21.6—26.4 Vac), 50–60 Hz, 8.4 VA, 350 mA,
single Class 2 source only, 100 VA or less
or
26 Vdc (24 Vdc min, 30 Vdc max), 7.41 W, 285 mA
Local Access port For system start-up and troubleshooting
Rnet port The RC642D Room Controller supports up to 4 RS Standard
room sensors for averaging or high/low select control.
The RC642 supports up to 3 RS Standards and one RS Plus,
RS Pro, or RS Pro-F sensor.
Inputs 4 inputs configurable for thermistor or dry contact. Inputs 3
and 4 are also configurable for 0–5 Vdc.
Input resolution 10 bit A/D
Input pulse frequency 10 pulses per second. Minimum pulse width (on or off time)
required for each pulse is 50 msec.
Digital outputs 6 digital outputs, relay contacts rated at 1 A max @ 24 Vac.
Configured normally open.
Analog outputs 2 analog outputs, 0–10 Vdc (10 mA max)
Output resolution 8 bit D/A
Microprocessor High speed 16-bit microprocessor with ARCNET
communication co-processor
Memory 512 kB non-volatile battery-backed RAM, 1 MB Flash
memory, 16-bit memory bus
Real-time clock Battery-backed real-time clock keeps track of time in event
of power failure
Battery 7-year Lithium BR2330 battery provides a minimum of
10,000 hours of data retention during power outages
Protection Incoming power and network connections are protected by
non-replaceable internal solid-state polyswitches that reset
themselves when the condition that causes a fault returns to
normal. The power, network, input, and output connections
are also protected against voltage transient and surge
events.
BT485 connector You attach a BT485 (not included) to a controller at the
beginning and end of a network segment to add bias and to
terminate a network segment.
Status indicators LED's indicate status of operation, errors, and power
Environmental operating
range
32–122°F (0–50°C), 10–90% relative humidity, non-
condensing
Physical Plastic enclosure, removable screw-type terminal blocks
Overall dimensions Width:
Height:
6 3/4 in. (17.2 cm)
4 1/4 in. (10.8 cm)
Weight 10.6 oz. (0.3 kg)
Specifications
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