The document discusses options for installing a CRC220 or CRC221 network access controller, including enclosure types, communication methods, and cabling requirements. It provides guidelines for setting up an RS485 or TCP/IP network with the controllers and connecting various components like readers, locks, door contacts and inputs. Wiring diagrams demonstrate proper installation of the controllers, readers, locks and other devices. Information on addressing nodes and configuring inputs is also included.

1. CRC220
Network
Installation

2. Equipment Options
2 reader 2 door (CRC220) or 2 reader single door
controllers (CRC221)
PCB only (TCP or 485) – For replacement or if specific
PSU is required
Plastic Enclosure – light to fit, 1/2/4 door configuration,
TCP or 485
Metal enclosure – traditional metal case 1/2/4 door
configuration TCP or 485
TCP and 485 replacement Interface boards are
available

3. Communications Network
Products are available with either RS485 or
TCP/IP connectivity
TCP controllers have RS485 network output
A USB to RS485 converter is required if
TCP/IP is not used
Several USB or TCP/IP comm ports can be set
up with up to 32 controllers on each
Overall limit is 128 controllers

4. RS485 Only
PC running Norpass Up to 1200m of Belden 9729 or CAT5-Shielded
Software
USB/ RS485
RS485
USB/ RS485
RS485
If required, every controller could
be on it’s own comm port

5. TCP/IP
PC running Norpass
Software
Each TCP controller has an RS485
network available for connecting
further controllers if required
RS485
TCP/IP
LAN/WAN
RS485
TCP/IP

6. Mixed TCP/IP and RS485
USB/ RS485
RS485
RS485
TCP/IP
LAN/WAN
RS485
TCP/IP

7. RS485 Correct Configurations
Terminate
Terminate
Terminate Terminate

8. RS485 Incorrect Configuration

9. TCP/IP Correct Configurations
Terminate
TCP/IP
TCP/IP Terminate
Controller
Terminate TCP/IP Terminate
Controller
TCP/IP

10. RS485 - Cabling
Maximum distance between
Fit Jumper
1st and last device = 1,200m to terminate
Use 2 twisted pair screened at this
controller
cable such as Belden 9729 or
CAT5-Shielded
Use 1 twisted pair for D+ and
D- and the other twisted pair
for signal ground
Belden 9729
Or CAT5-Shielded

11. TCP - Terminating Resistors
TCP/IP Network
LTRX XPort
Fit the 120R resistor across
D+ and D- . You will also
have to fit the jumper at the
controller situated at the
other end of the RS485
network.
Twisted Pair
Other Cores for
signal GND

12. Checking the data cable
At one end of the cable, ensure the resistance
between the wires carrying D+ and D- is
between 60 – 80 ohms if there are any shorts,
check the cable, if the resistance is much
higher, check the terminating jumpers or
resistors are fitted.
Check there is no short between either data
core and the shield
Check the shield is continuous and connected
to earth at one end

13. RS485 - Shielding Examples
All shields connected through and earthed at one end
Each shield earthed at one end only

14. CRC220 Installation

15. Locating the Enclosures
Find a suitable site for mounting the enclosure
Must be inaccessible from the unsecured side
of the door
A fused spur connection will be required
As close to the controlled door as possible
(Nortech recommendation)
Remember 1200m RS485 constraint
If necessary use more than one network

16. CRC22x Capacity
Each Interface Card can operate 2
independent doors (CRC220) or a single door
with two readers (CRC221)
If read in/read out is required with accurate
reporting then each interface can only control
one door (CRC221)
If in/out reading is required, but reporting for
that door will not require in/out activity, then the
interface can control two doors, but using up to
4 readers (CRC220)
Additional readers are connected in parallel to
standard ones

17. CRC221-1 Usage

18. CRC220-2 Usage

19. CRC221-2 Usage

20. CRC220-4 Usage

21. CRC220 Wiring
Mains cable termination
Additional individually
fused 12VDC supplies
Battery backup facility
Remove Tab and posts
if required

22. Fuse Board
The Fuse board has a contact for providing power to 4 of the
fuses
This contact can be passed through a fire alarm relay to directly
drop power from the door magnets
Switched outputs
Link

23. CRC22x Wiring – RS485
RS485 Network Connection
(option for TCP/IP thin server)

24. CRC22x Wiring – TCP
RS485 Network Connection
Off back of TCP board

25. CRC22x Wiring - Readers
Reader Interfaces
Power Reader 1
0V
Clock/D1
Data/D0
LED Reader 2
Capture
Set jumpers to select correct
reader voltage

26. Nortech Reader Wiring
EM2100SL
Connect to 12VDC for Wiegand output
Connect to 0V for Clock & Data output
12VDC
0V
Clock/D1
Data/D0
LED/Buzzer
Yellow for LED control (normal)
Brown can be connected if Buzzer is
required while door is unlocked.

27. Locks
Choice of lock will depend on the type of installation
Mag Lock are always Power to Lock (Fail Safe) so
require battery back up to maintain security in event of
a power fail
Mag locks are simple to add to an existing door
Electric strikes can be Power to Lock or Power to
Unlock (Fail Secure). Power to unlock (fail secure)
does not require battery back up to maintain security in
a power failure, but may need a mechanical override
for H&S reasons
Strike locks require more knowledge of Door furniture
and are more difficult to fit

28. Connecting Locks
As with all systems, back EMF devices MUST
be fitted correctly
We always recommend using a DIODE
MOV’s or capacitor/resistor networks can be
used for AC applications, however they are not
as effective as diodes and can fail in the field
with no indication. (This means protection will
stop)
As the output is a voltage free relay, it can be
used for Fail Safe or Fail Secure installations

29. CRC220 Wiring
Relay 2 Relay 1
Output Relays
Comm
N/O
N/C
Relay
operated
LED
Always fit back EMF protection
across inductive loads

30. Connecting Locks
12V DC Strike Lock
12V DC (Fail Secure)
Mag Lock
(Fail Safe)
Diode Diode
CRC220 Relay
CRC220 Relay
Diode Must be as close to
the lock as possible
Ground Ground

31. Door Monitor and REX
Door 1
Door 2
0V
REX
Contact
For monitoring Doors, we do not
recommend monitored Mag-
locks. These do not monitor the
door position, only the lock
status. This compromises
security and is not good for
reporting

32. Door Monitor and REX
Rex Button must be Normally OPEN
Ground is common
Door Contacts must be OPEN when
door is OPEN

33. CRC220 Nodes
Switch Settings
Node Address: SW1-5
Each controller connected to a comm port must have a unique node
Each comm port can support Nodes 0-31

34. CRC220 Nodes
Switch Settings
Node = 0
3
4
2
1

35. CRC22x Inputs
Inputs 1 – 4 are pre configured
1= Tamper
2,3 = Reader arming
4 = Fire Alarm input
Inputs 5 – 8 are configurable
Each can be assigned a
message, however this message
is then applied to all controllers

36. CRC22x Fire Input
Fire Alarm
Fire Alarm will Open all doors when it is grounded
All inputs will report Open or Grounded states

37. CRC22x Outputs
Outputs are ‘Open Collector’ capable
of sinking 200mA of current each
Output 1 follows door 1 left open and
Tamper faults and is latched on by
Door 1 Forced Open
Output 2 follows Door 2 left Open and
is latched on by door 2 Forced Open
Output 3 and 4 can be configured in the message table

38. CRC22x Outputs
12 or 5V dc
Relay/LED/Buzzer etc