Table 184: RS-232 pin assignments (DB25 PC
signal set) (older desktops only)
Pin Connection
Pin 8
Received line Signal Detector
(Data Carrier Detect)
Pin 20 Data Terminal Ready
Pin 22 Ring Indicator
The connector on the PC has Male pins, therefore the mating cable needs to terminate in a DB25/F
(Female pin) connector.
Table 185: RS-232 pin assignments (DB9 PC
signal set) (most laptops)
Pin Connection
Pin 1
Received line Signal Detector
(Data Carrier Detect)
Pin 2 Recieved Data
Pin 3 Transmit Data
Pin 4 Data Terminal Ready
Pin 5 Signal Ground
Pin 6 Data Set Ready
Pin 7 Request To Send
Pin 8 Clear To Send
Pin 9 Ring Indicator
The connector on the PC has male pins; therefore, the mating cable needs to terminate DB9/F
(female pin) connector.
Figure 85: Communications block diagram
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center200
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