Paxton Net2 RS485 high speed repeater User Manual
Paxton, Pc acu, Technical support
Ins-30069 Net2 RS485 high speed repeater
27/06/2011
Technical Support
Technical help is available: Monday - Friday from 07:00 - 19:00 (GMT)
Saturday from 09:00 - 13:00 (GMT)
01273 811011
Documentation on all Paxton products can be found on our website - http://www.paxton.co.uk/
The 1 Km Rule
The Net2 data line uses RS485 data signalling. This specifies that the data line is connected to the units as a series
of point-to-point nodes, NOT as a star, ring or multiple line network. Each cable must be terminated at each end
and the total length of any single line must not exceed 1000 metres.
Without termination, reflections of these fast signals will cause data propagation (multiple signals) resulting in
some data corruption. Star and ring layouts do not allow correct termination and so are not allowed because of
these signal reflections.
Termination
No individual data cable can be longer than 1000 metres as this is limited by the power of the data converter. By
using a repeater we can originate another 1000 metre data line from any point. For example, if we require a data
line of 1500 metres, the repeater can be placed anywhere within 1000 metres of either end of the data line.
The two sections become individual data lines and therefore both must be terminated at each end.
This is done on many units with a switch or jumpers. If not, free resistors are provided with the data converter.
A
B
C
D
SCRN
A
B
C
D
SCRN
Orange
White/Orange
Green
White/Green
ALL OTHER SPARE CORES
ALL OTHER SPARE CORES
White/Green
Green
White/Orange
Orange
Termination
resistors
12v
0v
Existing network
Additional network
Red 12v dc
Brown
Orange
Green
Yellow
Blue
Mauve
Black/White
Brown
Yellow
Reader 1
Orange
Keypad 1
+12v
0v
N.C.
N.O.
Com
N.C.
N.O.
Com
Alarm Output
0v
Contact
0v
Exit
0v
Tamper
PSU
Rx
Tx
Relay 1
Relay 2
Exit
Contact
Tamper
PSU
OK
5v
12v
Red
Br
own
Orange
Gr
een
Yellow
Blue
Mauve
Black/White
Br
own
Yellow
Orange
Reader 2
Keypad 2
Power
Relay 1
Relay 2
Inputs
Network
CA
T5 cable coding
White/Green
Green
White/Orange
Orange
1
2
3
4
Screen or spare cores
from network cable
CAUTION: for 12v d.c. r
eaders only
. For
corr
ect connection of old 5v r
eaders, r
efer to
instructions.
Serial number
241821
Test ID: 012345678901
z-1440
3
2
4
8
9
8
0
0
0
0
0
4
Up to 5 repeaters can be used on a data network. This gives a maximum distance of 6000 metres for a data line
with a repeater placed every 1000 metres down the line.
The repeater 'direction' must be wired as above.
Although the repeater is a bi-directional unit, the LED indications will be incorrect if this is not done.
Mark 2 PCB: Red = 12V (always on); Green = PC data (flashes if data is received from PC direction);
Yellow = ACU data (flashes if data is received from ACU direction - ACU's are responding to the PC data)
Mark 1 PCB: Green = 12V (always on); Red = PC data (flashes if data is received from PC direction);
Yellow = ACU data (flashes if data is received from ACU direction - ACU's are responding to the PC data)
See also:
AN1087 - How to create multiple data lines and side spurs with a repeater. < http://paxton.info/876 >
This unit has onboard resistors which can be put into circuit by putting the jumper across the 2 pins.
A
B
C
D
SCRN
A
B
C
D
SCRN
Termination
Resistor jumpers fitted
Termination
Greater than 1000 metres
PC
ACU
Paxton