SMC Networks HRSH Series, Operation Manual

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HRX-OM-Q033
Chapter 3 Serial communication
HRSH Series 3.1 Precautions wiring communication
3-1
Chapter 3 Serial communication
Serial communication (RS-485/RS232C) enables the remote control of
run/start of the product, temperature setting and details of product condition,
and alarm condition can be obtained.
The operating state of the product (run/stop) and the temperature setting can
be monitored by sending a request message made by the program of the
host computer (e.g. PC).
MODBUS communication and simple communication protocol can be
selected as the serial communication protocol. This chapter illustrates the
common specifications of serial communication. Chapter 4 and 5 illustrate
each protocol.
3.1 Precautions wiring communication
○
Communication wiring
A communication cable that connects the product and customer system is
not included with the product. Please prepare a cable, referring to 3.3
‘’Connected explanation’’ In order to avoid malfunction, do not connect to
any place other than those shown in 3.3
‘’Connected explanation’’.
3.2 Communication specification
Table 3.2-1 Serial communication specification
Item Specification
Connector type (for the product) D-sub9P type Female connector(Mounting screw:M2.6
×
0.45)
Standard Select from EIA RS-485
／
RS-232C
Circuit type Half duplex Half duplex
Transmission type Start-stop
Protocol
MODBUS terminal

1
／
Simple communication protocol
Terminal resistance
Select from with terminal resistance
（
120Ω
）／
Without terminal
resistance
：
Default setting

1
：
Refer to Modicon Co. protocol specifications "PI-MBUS-300 Rev.J".