EnOcean RCM 255 User manual

Universal 1-channel switching receiver
RCM 255
User Manual V1.12
January 2007

Revision History
The following major modifications and improvements have been made to the initial version of
the document (User Manual V1.0):
Version Subject (major changes since last version)
V1.1 Relay output switching capabilities added (chapter 1.5)
V1.11 Power dissipation added
V1.12 Relay switching capabilities corrected
Published by EnOcean GmbH, Kolpingring 18a, 82041 Oberhaching, Germany
www.enocean.com, [email protected], phone ++49 (89) 6734 6890
© EnOcean GmbH, All Rights Reserved
Important!
This information describes the type of component and shall not be considered as assured characteristics. No
responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change
without notice. For the latest product specifications, refer to the EnOcean website: http://www.enocean.com.
As far as patents or other rights of third parties are concerned, liability is only assumed for modules, not for the
described applications, processes and circuits.
EnOcean does not assume responsibility for use of modules described and limits its liability to the replacement of
modules determined to be defective due to workmanship. Devices or systems containing RF components must meet
the essential requirements of the local legal authorities. The approval requirements described in this document are of
best knowledge without any warranty.
The modules must not be used in any relation with equipment that supports, directly or indirectly, human health or life
or with applications that can result in danger for people, animals or real value.
Components of the modules are considered and should be disposed of as hazardous waste. Local government
regulations are to be observed.
Packing: Please use the recycling operators known to you. By agreement we will take packing material back if it is
sorted. You must bear the costs of transport. For packing material that is returned to us unsorted or that we are not
obliged to accept, we shall have to invoice you for any costs incurred.
©EnOcean GmbH, A. Anders Page 2 of 18 RCM 255 User Manual V1.12

Table of Contents
1. GENERAL DESCRIPTION________________________________________________________________ 4
1.1 Basic Functionalities ________________________________________________________________ 4
1.2 Typical Applications _________________________________________________________________ 4
1.3 Features Overview __________________________________________________________________ 5
1.4 Physical Dimensions ________________________________________________________________ 6
1.5 Relay output switching capabilities ________________________________________________ 8
1.6 Terminal Block and Wiring Description ____________________________________________ 9
1.7 Environmental Conditions __________________________________________________________ 9
1.8 Ordering Information _______________________________________________________________ 9
2. FUNCTIONAL DESCRIPTION __________________________________________________________ 10
2.1 Block Diagram ______________________________________________________________________ 10
2.2 Wire Description ___________________________________________________________________ 10
2.3 Operating Mode ____________________________________________________________________ 11
2.4 Learning of Radio Transmitters ___________________________________________________ 11
2.5 Selective Deleting __________________________________________________________________ 12
2.6 Clear All_____________________________________________________________________________ 12
3. APPLICATIONS INFORMATION _______________________________________________________ 13
3.1 Installation _________________________________________________________________________ 13
3.2 Mounting RCM 255 Near To Metallic Objects _____________________________________ 14
3.3 Transmission Range _______________________________________________________________ 14
3.4 FCC/IC Approval ___________________________________________________________________ 16
3.5 cCSAus Approval ___________________________________________________________________ 17
3.6 Field Intensity Meter EPM 100 ____________________________________________________ 17
4. CERTIFICATE OF CONFORMITY _______________________________________________________ 18
©EnOcean GmbH, A. Anders Page 3 of 18 RCM 255 User Manual V1.12

1. GENERAL DESCRIPTION
The 1-channel switching receiver RCM 255 is a RF receiver designed to switch various
120V electronic loads such as incandescent lamps, high-voltage halogen lamps, electronic
ballast and inductive loads upon receipt of authenticated radio packets sent by EnOcean
transmitters. An EnOcean transmitter can simultaneously control an unlimited number of
receivers. Each transmitter has its own fixed 32-bit address. The RCM 255 ‘LEARNS’ the
address of transmitters that are assigned to the receiver.
1.1 Basic Functionalities
Each RCM 255 can operate as either a Push Button Switch receiver (by LEARNING EnOcean
PTM Switches) or a Magnet Contact Receiver (by LEARNING EnOcean STM 250 magnet
contacts), but not a mix of devices. The RCM 255 can LEARN either a maximum of 30
EnOcean PTM’s or up to 2 EnOcean STM 250’s. The memory of the receiver is empty when
delivered. By assigning the first transmitter the operating mode (push button switch or
magnet contact) is defined. The operating mode can only be changed after deleting all learned
transmitters with the CLR button.
a) Mode ROCKER SWITCH: Each assigned transmitter can be used to change the
switching state of the receiver. It is possible to switch ON (button I) with one switch
and to switch OFF (button O) with another switch. When learning a radio switch with
2-rockers, only the rocker which has been pressed is learned by the receiver.
b) Mode WINDOW CONTACT: If at least one of the assigned window contacts is
open, the switching state of the receiver is ON. If both contacts are closed the state
is OFF. The window contacts transmit a ‘supervisory signal’ approx. every 15min. If
there has been no supervisory signal for more than 60 minutes, the RCM255
considers the contact closed.
Figure 1: 1-channel switching receiver RCM255
1.2 Typical Applications
• Building installation
• Industrial automation
• Consumer Electronics
©EnOcean GmbH, A. Anders Page 4 of 18 RCM 255 User Manual V1.12

The RCM switching receiver is part of a powerful RF system solution from EnOcean for
operation and control applications. Because the RF transmitters are self-powered (no
batteries), maintenance-free RF systems can be implemented.
The RCM switching receiver operates together with the following further EnOcean components:
PTM (batteryless radio switches), STM 250 (batteryless radio window contact), CTM (remote
control) and TCM (bi-directional IT interface)
1.3 Features Overview
Power Supply: ......................................................................................120 VAC, 60 Hz
Power Dissipation: ................................................................................ 1300mW max.
Relay Output: ..................................................maximum load 1100VA resistive (cosφ=1)
200W tungsten (incandescent lamp), 140W ballast with cosφ=0.4 – 0.6 (fluorescent lamp)
Radio Frequency: ................................................... 868.3 MHz (stabilized by crystal PLL)
Channel Bandwidth / Sensitivity: ..................................................... 280 kHz / -95 dBm
Antenna:...................................................................................... internal whip antenna
Control Inputs: ....... 2 pushbuttons LRN (set receiver into learning mode) and CLR (clear all)
Learning Mode Indication: ............................ acoustic feedback (switching noise of relay)
Number of RF transmitters learnable: .........up to 30 switches or up to 2 magnet contacts
Note: either PTMs or either STM250s can be learned, not mixed (for priority reasons)
Figure 2: RCM 255 housing (without wiring)
©EnOcean GmbH, A. Anders Page 5 of 18 RCM 255 User Manual V1.12

1.4 Physical Dimensions
Dimensions of housing: ............................................................. 48.4 x 37.1 x 32.4 mm
Tolerance values of the following outline drawings: .................................. +/- 0.2 mm
Please note: The following drawings are without the factory installed wiring!
Total depth of both holes from box top to pushbutton: 1.0 mm
Travel of pushbutton: 0.5 to 1.0 mm
Figure 3: RCM 255 top view
©EnOcean GmbH, A. Anders Page 6 of 18 RCM 255 User Manual V1.12

Figure 4: RCM 255 front view
Figure 5: RCM 255 side view
©EnOcean GmbH, A. Anders Page 7 of 18 RCM 255 User Manual V1.12

1.5 Relay output switching capabilities
Kind of load Maximum Load Electrical life
2 x 100W 20.000 (according to EN60669) Incandescent lamp 120V AC
Gas discharge lamps / HQL-HQI / not
compensated*
60W 20.000
Gas discharge lamps / HQL-HQI /
compensated*
50W (14µF) 20.000
EGC Dynamic / dimmer* 1 x 18W
1 x 36W
25.000
Halogen lamp 120V AC 80W 20.000
12 x18W 25.000
4 x 36W 25.000
Not
compensated
cosϕ0,4 – 0,6 2 x 58W 25.000
2 x 18W 20.000Compensated
with capacitance
in parallel 1 x 36W 20.000
2 x 18W 20.000
Fluorescent lamp
120V AC
with conventional
ballasts
Compensated
fluorescent
DUO-circuit 1 x 36W 20.000
4 x 18W 20.000
2 x 36W 20.000
Fluorescent lamp
120V AC
with electronic
ballasts
Siemens /
Osram
EVG 1 x 58W 20.000
10A Min. 50.000 Resistive load
120V AC
cosϕ=1
Max. capacitance at 120V AC 14 µF Min. 5.000 (according to
EN60669)
Max. inrush current for max. 20ms at
120V AC
40 A see above loads
©EnOcean GmbH, A. Anders Page 8 of 18 RCM 255 User Manual V1.12

1.6 Terminal Block and Wiring Description
Terminal Block: .................................................... 4 pole, terminal screw with wire guard
Rated torque/ screw size: ..................................................................... 0,4 Nm / M2,6
Max. rated cross section - Single wire (solid): ............................................... 1.5 mm2
Max. rated cross section - Stranded wire (flex.): ........................................... 1.0 mm2
Max. rated cross section - Stranded wire with ferrules: ................................0.75 mm2
For easiest installation the RCM 255 is delivered with factory installed wiring as follows:
Wiring: ................................. 4 wires, stranded, gauge AWG16 (1.3mm), length 7” (18cm)
Color of wires: ............black for Hot, red for Load, 2 x white for Neutral (internally coupled)
The wire ends do have the plastic sheathing cut and partially pulled, but not fully removed to
prevents the fraying of wires: Wire ends pre-stripped 0.6" (16mm) with ends left on, blank
cable core 0.2" (5mm)
terminal
screw
insulator
wire guard
terminal
block
Figure 6: RCM 255 terminal block
1.7 Environmental Conditions
Operating Temperature:..................................................................... -10 up to +45 °C
Storage Temperature:........................................................................ -25 up to +80 °C
Humidity:...................................................................... 0 % to 95 % r.h., no condensing
1.8 Ordering Information
Type EnOcean Ordering Code Remarks
RCM 255 H5002-B255 120 VAC / 60Hz
©EnOcean GmbH, A. Anders Page 9 of 18 RCM 255 User Manual V1.12

2. FUNCTIONAL DESCRIPTION
2.1 Block Diagram
Figure 7: Block diagram of RCM 255
2.2 Wire Description
Symbol Wire Color Function Operational characteristics
F red Fixture Relays output switched to Hot
S black Hot Power Supply 120 VAC, 60 Hz
N white Neutral Power Supply 120 VAC, 60 Hz
N white Neutral Internally coupled to second white wire
©EnOcean GmbH, A. Anders Page 10 of 18 RCM 255 User Manual V1.12

2.3 Operating Mode
Each RCM 255 can operate as either a Push Button Switch receiver (by LEARNING EnOcean
PTM Switches) or a Magnet Contact Receiver (by LEARNING EnOcean STM 250 magnet
contacts), but not a mix of devices. The RCM 255 can LEARN either a maximum of 30
EnOcean PTM’s or up to 2 EnOcean STM 250’s. The memory of the receiver is empty when
delivered. By assigning the first transmitter the operating mode (push button switch or
magnet contact) is defined. The operating mode can only be changed after deleting all learned
transmitters with the CLR button.
a) Mode ROCKER SWITCH: Each assigned transmitter can be used to change the switching
state of the receiver. It is possible to switch ON (button I) with one switch and to switch OFF
(button O) with another switch. When learning a radio switch with 2-rockers, only the rocker
which has been pressed is learned by the receiver.
Initialization: After Power-up and Learning Phase the relays output is open (“off”). At
least one of the learned radio switches have to be operated to switch the output.
b) Mode WINDOW CONTACT: If at least one of the assigned window contacts is open the
switching state of the receiver is ON. If both contacts are closed the state is OFF.
Time Out: If at least one of the assigned window contacts is open, the switching state
of the receiver is ON. If both contacts are closed the state is OFF. The window contacts
transmit a ‘supervisory signal’ typically every 15 min (5…30 min). If there has been no
supervisory signal for more than 60 (± 10%) minutes, the RCM 255 considers the
contact closed.
Potential reasons the supervisory signal is not received include: The energy store of the
window contact is empty, make sure the solar cell receives sufficient light, the radio
channel is disturbed by interference or obstructions, the window contact has been
removed, or the contact is broken
Initialization: After Power-up and Learning Phase the module output OUT_0 is
inactive (“off”). At least one of the learned magnet contacts have to be opened to
release the output immediately (before first incoming presence signal).
2.4 Learning of Radio Transmitters
1.) For programming the RCM255 must be connected to power. The programming is
retained when power is disconnected. To prevent LEARNING unintentional switches,
when in Programming mode, the receiver sensitivity is reduced to approximately 5
meters from the switch.
2.) Operating the LRN or CLR pushbutton should be done by pushing a non-metallic
insulated probe (e.g. plastic ballpoint pen) carefully through the small hole in the
housing onto the pushbutton behind.
3.) Press and hold the LRN button approximately 0.3 seconds until Programming mode
activates which is confirmed by 1 second cyclic switching of the output relays
(“Toggling”): A light connected to the power output will be switched on and off every
second. In quiet environments the Toggling of the relay can be heard.
©EnOcean GmbH, A. Anders Page 11 of 18 RCM 255 User Manual V1.12

4.) Transmitters can now be LEARNED: By pressing one of the rockers of a PTM radio
switch or by pressing the learn button inside the back cover of the STM250 magnet
contact, the transmitter is assigned to the switching receiver, and the relay stops
Toggling for about 4 seconds. The relay status confirms that the transmitter has been
saved (contact remains on for 4seconds ) or a previously learned transmitter is deleted
(contact 4s off).
5.) As soon as the Toggling of the relays resumes, additional transmitters can be LEARNED
or deleted. If the RCM255’s memory is full (30 EnOcean PTM 250 radio switches or 2
EnOcean STM 250 radio window contacts) the receiver terminates Programming mode
and returns to operating mode during an attempt to enter another transmitter. In this
case at least one ID has to be deleted before LEARNING a new transmitter.
6.) To exit Programming mode, re-press the LRN button, or after 30 seconds of no activity
the receiver automatically exits Programming mode.
2.5 Selective Deleting
A transmitter that has been LEARNED can be selectively deleted. The Programming mode is
activated by pressing the LRN button. Then actuate the rocker or learn button of a previously
learned transmitter, it is now UNLEARNED. Exit Programming mode by repressing the LRN
button.
2.6 Clear All
If the CLR key is pressed and held for approx. 2 seconds the memory is deleted completely
(condition upon delivery). Then the RCM255 receiver enters Programming mode which is
signalled by the Toggling output relays. Programming mode is left manually by pressing the
LRN button.
©EnOcean GmbH, A. Anders Page 12 of 18 RCM 255 User Manual V1.12

3. APPLICATIONS INFORMATION
3.1 Installation
1.) WARNING: To avoid fire, shock, or death: TURN OFF POWER at circuit breaker or fuse
and test that power is off before wiring!
2.) For in-wall mounting an outlet box must be used. For best performance do not mount
the receivers close to the floor or near to wall niches. Do not mount the receiver into a
metal housing.
3.) Prepare wires: Pull off pre-cut insulation from RCM255 leads. Make sure that the wires
are not frayed, cut if necessary removing 5/8” (1.6cm) of insulation from each wire.
4.) Connect wires per EXAMPLE CIRCUIT as follows: Both white wires are coupled internally
(N). Screw wire nuts on clockwise making sure no bare conductors show below the wire
connectors. Secure each connection with electrical tape.
5.)
Installation may now be completed by carefully positioning all wires and stowing the
receiver box. Restore power.
Figure 8: RCM 255 Example Circuit
The integrated ¼-wave whip antenna enables a very compact receiver unit with good radio
reception characteristics. For good receiver performance take attention to the factors
restricting transmission range mentioned in the next both chapters.
Please note that the best range performance can be received by facing EnOcean
©EnOcean GmbH, A. Anders Page 13 of 18 RCM 255 User Manual V1.12

transmitters to the RCM 255 receiver casement top position (see antenna marking on
cap). This is a result of the internal antenna position that can be seen in the following picture:
Far end of
the whip
Figure 9: Internal position of the RCM 255 whip antenna
3.2 Mounting RCM 255 Near To Metallic Objects
For range performance a minimum distance of 1 cm, better 2 cm, should be given
from the whole length of the antenna to any conductive objects. Mainly the far end
of the whip should be mounted as far away as possible from all metal parts.
The internal position of the antenna is shown in Figure 9.
Please note that large metallic parts or conductive objects in the transmission direction causes
shading of the radio waves that could result in range reduction. Using a suited placed repeater
is a prospective remedial measure.
Do not mount the receiver into an enclosed metal housing.
3.3 Transmission Range
Since the radio signals are electromagnetic waves, the signal is attenuated on the way from
the transmitter to the receiver. This means that the field intensity diminishes as the distance
between the transmitter and the receiver increases, and radio range is restricted. Obstacles
between devices can also reduce the range.
In practice, this means that the materials used in the building play an important role when an
assessment of the radio range is made. Some standard values for helping in assessing the
environment:
• Line-of-sight connections: Typically 30m range in corridors, up to 100m in halls
• Plasterboard walls / dry wood: Typically 30m range, through max. 5 walls
• Brick walls / aerated concrete: Typically 20m range, through max. 3 walls
• Ferroconcrete walls / ceilings: Typically 10m range, through max. 1 ceiling
©EnOcean GmbH, A. Anders Page 14 of 18 RCM 255 User Manual V1.12

• Fire-safety walls, elevator shafts, staircases and supply areas should be
considered as screening.
Other factors restricting transmission range:
• Switch mounted on metal surfaces (up to 30% loss of transmission range)
• Hollow lightweight walls filled with insulating wool on metal foil
• False ceilings with panels of metal or carbon fiber
• Lead glass or glass with metal coating, steel furniture
• Mounting transmitter or receiver on the floor, or close to the floor, or at
wall niches
• Humidity in materials
• Devices transmitting RF signals such as computers, audio and video
equipment, or electronic gear controls for lamps. A minimum distance of
0.5m should be kept
The angle at which the transmitted signal hits the wall is very important. The effective wall
thickness – and with it the signal attenuation – varies according to this angle. Signals should
be transmitted as directly as possible through the wall. Wall niches should be avoided.
Figures 10 and 11: Obstacles reducing the transmission range
Please note: 868 MHz frequency range is used by Trunk Radio in the US. Since a clear
reduction of transmission range is to be expected near to trunk radio stations, range
tests at the system’s target location should categorically be performed before
notification of a particular range in the US and Canada!
©EnOcean GmbH, A. Anders Page 15 of 18 RCM 255 User Manual V1.12

3.4 FCC/IC Approval
This device complies with Part 15 of the FCC Rules and with RSS-210 of Industry Canada. If
this device is operated in compliance with the following requirements it can be operated
without notification and free of charge in the area of the United States of America
and in Canada.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that
may cause undesired operation.
This device complies with Part 15 of the FCC Rules and with RSS-210 of Industry
Canada. Operation is subject to the following two conditions. (1) this device may not
cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
FCC ID: SZV-RCM255
IC: 5713A-RCM255
Trade Name: RCM 255
Model No: RCM 255
Warning: Changes or modifications made to this equipment not expressly approved
by EnOcean may void the FCC authorization to operate this equipment.
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential installation.
This equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio
communications.
However, there is no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
Due to FCC 15.231 operational and timing requirements the PTM switch device must not be
operated more than 1088 times per hour (pushed or released as one operation each):
• Total duration of transmissions must not exceed more than two seconds per hour
• PTM 200 packet length is 0.7 ms, max. 5 redundant packets, tolerance of 5% in packet
length, 50% on average packet Ton/Toff ratio
©EnOcean GmbH, A. Anders Page 16 of 18 RCM 255 User Manual V1.12

Due to FCC 15.231 operational and timing requirements, the STM 250 magnet contact
must not be operated more than 1414 times per hour (opened or closed):
• Total duration of transmissions must not exceed more than two seconds per hour
• STM250 packet length is 0.9 ms, 3 redundant packets, tolerance of 5% in packet
length, 50% on average packet Ton/Toff ratio
3.5 cCSAus Approval
This device complies with CSA C22.2 No.14 and UL 508. It can be operated without notification
in the area of the United States of America and in Canada
3.6 Field Intensity Meter EPM 100
The EPM100 is a mobile field-intensity meter that helps the engineer to find the best
installation positions for sensor and receiver. It can also be used to check disturbances in links
to already installed equipment. The EPM 100 can be used to identify 868 MHz trunk
radio!
The EPM100 displays the field intensity of received radio telegrams and interfering radio
signals in the 868MHz range.
The simplest procedure for determining
the best installation positions for the
radio sensor/receiver:
• Person 1 operates the radio
sensor and generates pushbutton
radio telegrams.
• Person 2 checks the received field
intensity on the meter display to
find the optimal installation
position.
Figure 12: EPM 100 helps to qualify installation positions
©EnOcean GmbH, A. Anders Page 17 of 18 RCM 255 User Manual V1.12

4. CERTIFICATE OF CONFORMITY