SMC Networks HRSH150-A*-40 Series - RS-485 Communication Wiring

HRX-OM-Q026
Chapter 3 Transport and Setting Up
3.3 Installation HRSH Series
3-26
3.3.8 RS-485 communication wiring
Serial communication RS-485, operation Start/Stop, setting and reading of
circulating fluid temperature, and reading of alarm condition can be
performed by remote control.
Refer to Operation Manual Communication Function for more details.
 Wiring of interface communication cable

Connecting to PC
RS-485 cannot be directly connected to a normal PC. Use an
RS-232C/RS485 converter which is available on the market.
Be sure to follow the wiring procedure shown below for connecting multiple
thermo-chillers.

Configuration of connection
One thermo-chiller for one host computer, or multiple thermo-chillers for one
host computer.
(31 thermo-chillers can be connected at maximum.)
Fig. 3-14 Connection of RS-485
[Tips]
Both ends of the communication connection (the end nodes) need to be
connected to the host computer.
With or without the terminating resistor (120Ω) of this product can be set by
the operation display panel. Refer to “5.22 Communication Function”.
1
SD+
5
SG
9
SD-
SD+
SD- SG
Terminal
resistance
Master This product
(first slave)
1
SD+
5
SG
9
SD-
This product
（second slave）
1
SD+
5
SG
9
SD-
This product
（31
st
slaves）
Terminal
resistance120Ω
Be sure to turn OFF the breaker of the facility power supply (the
user's machine power supply) before wiring.