Schematic Diagram Of A Pcd7.Lrxx-P5 Room Controller In An Rs-485 Bus With Terminating Resistors - SBC PCD7.LR P5 Series Manual

Saia-Burgess Controls AG
1
LEDs for RS-485 port 1 and port 0
The LEDs shown above indicate the data communication on the RS-485 port
in question.
Tx = send
Rx = receive
(x stands for the port number)
Ensure that the AC cables are separated from the signal wiring!
5.3.1 Schematic diagram of a PCD7.LRxx-P5 room controller in
an RS-485 bus with terminating resistors
An RS-485 bus must be terminated at both ends of its cable with terminating re-
sistors (see following figure). Since the PCD7.LRxx-P5 devices do not provide this
termination, it must be provided using other devices.
S-Bus cables must be connected in a line topology. Stubs are not allowed, and
both ends of the cable must be terminated with a resistor (approx. 120 Ω) between
the D and /D cables. The best signal quality is achieved through active bus termi-
nation, each with a resistance to +5 V and GND.
Devices that can do this on both sides of the S-Bus cable without much effort are:
► All Saia PCD
► Termination boxes PCD7.T161 (230 VAC) or PCD7.T162 (24 V DC)
► Third-party devices with this function are suitable for this purpose.
Hardware manual PCD7.LRxx-PG5 room controller │ Document 27-653; version ENG07 │ 2019-03-21
20 21 22
/DA+ DB- GND
26 27 28 29 30 31
23 24 25
Sylk Bus
RS485 / Port 1
0-10V
V
Power Supply
--- 24 VAC In
230 V In 24 VAC Out
1 2
3 4
L N
24V~ 24V0
3 4
2
CPUs
®
32 33 34 35 36
AO0... UI0...
RS-485 interfaces (ports 0 + 1) in general
GND GND
TN T~ TO0 TN TO1
!
T1 R1 T0 R0
5 6 7 8 9 10 11
TN T~ TO0 TN TO1 RO3 IN3
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
37 38 39 40 41 42
Communication
RS485 / Port 0
Dig. NTC 0-10 V
V
RUN/HALT
RO3 IN3 RN RN IN0 RO0 IN1 RO1 IN2 RO2
12 13 14 15 16 17 18
RN RN IN0 RO0 IN1 RO1 IN2
/D A +
D B -
USB
19
RO2
5
5-5