Communication Function Contact Input/Output Item Specifications Connector type M3 terminal block Input signal Insulation method Photocoupler Rated input voltage 24 VDC Operating voltage range 21.6 to 26.4 VDC Rated input current 5 mA TYP Input impedance 4.7 kW Contact output signal Rated load voltage 48 VAC or less/30 VDC or less Maximum load current 500 mA AC/DC (resistance load) Minimum load current 5 VDC 10 mA Output voltage 24 VDC ±10% 500 mA MAX (No inductive load) Circuit diagram To the thermo-chiller User’s equipment side 24 VDC Contact output signal 1 Contact input signal 2 Contact output signal 3 Contact output signal 2 24 VCOM Contact input signal 1 4.7 kΩ 4.7 kΩ 1 kΩ 1 kΩ Alarm status signal output Run/stop signal input Operation status signal output Remote status signal output . Signal description Default setting 0 8 1 9 2 10 3 11 4 12 13 14 15 7 5 6 24 VDC output (500 mA MAX) 24 VCOM output Internal circuit * The pin numbers and output signals can be set by user. For details, refer to the Operation Manual for communication. Item Specifications Connector type D-sub 9-pin, Female connector Protocol Modicon Modbus compliant/Simple communication protocol Standards EIA standard RS-485 EIA standard RS-232C Circuit diagram 1 9 Internal circuit To the thermo-chiller User’s equipment side SD+ SG SD. 5 2 3 5 To the thermo-chiller User’s equipment side RD SD SG Internal circuit * The terminal resistance of RS-485 (120 W) can be switched by the operation display panel. For details, refer to the Operation Manual for communication. Do not connect other than in the way shown above, as it can result in failure. Serial Communication The serial communication (RS-485/RS-232C) enables the following items to be written and read out. For details, refer to the Operation Manual for communication. Writing Run/Stop Circulating fluid temperature setting (SV) Please download the Operation Manual via our website, http://www.smcworld.com Readout Circulating fluid present temperature Circulating fluid discharge pressure Status information Alarm occurrence information 21 Series HRSH Inverter Type a