MKS 651D Series, User Manual, Page: 44 / 162

Rear Panel Components Chapter Three: Overview
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Rear Panel Components
Valve Transducer RS-232 Serial Line Voltage
Connector Connectors Interface Connector Selector Switch
Interface I/O Power On/Off Fuse Holder
Connector Switch
Figure 9: Rear Panel of the 651 Controller
Valve Connector - Slot 4
The 9-pin female Type “D” connector is used to attach either a 653 or 253 throttle valve to the
651 controller. Refer to Table 10 on page 23, for the Valve connector pinout.
Transducer Connectors - Slot 3
The 15-pin female Type “D” connectors are used to attach transducers to the 651 controller.
Refer to Table 9, on page 22 for the Transducer connector pinout.
Interface Connector - Slot 2
The 37-pin female Type “D” Interface (I/O) connector provides access to the set points, process
limit relays, softstart control, and the valve control functions. Refer to Table 8, for the Interface
connector pinout.
RS-232 Serial Interface Connector - Slot 1
The 9-pin male Type “D” RS-232 Serial Interface connector provides an interface for RS-232
communications. Refer to Table 7, on page 20, for the RS-232 Serial Interface connector pinout.
Power ON/OFF Switch
This switch turns power to the 651 unit on and off.