MKS 1253D, Инструкция по эксплуатации

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Chapter Three: Overview Internal Controls on the 153/1253 Controller
35
Explanation of the Dipswitch Settings
Dipswitch OFF (Open) ON (Closed)
8 Position Controller Pressure Controller*
7 Digital Set Point Analog Set Point*
6 Standard RS-232 Protocol Terminal Protocol*
5 No Parity* Even Parity
4 1200 Baud 9600 Baud*
3 CR Delimiter* CR-LF Delimiter
2 Set Point entry (Sxxx.x) Set Point entry (S1xxx.x)*
1 Reverse Control Normal Control*
* Indicates default switch settings as shipped from factory
Table 10: Explanation of the Dipswitch Settings
Switch 8:
Selects the method of control. When OFF, the 153/1253 unit acts as a position
controller. When the switch is ON the valve acts as a pressure controller.
Switch 7: This switch selects the source of the set point signal. When the switch is OFF, the
153/1253 controller expects to receive the set point signal via the RS-232 interface. When ON,
the 153/1253 controller expects the set point signal to be an external analog voltage on the
INPUT connector. You can override the analog set point by sending an RS-232 signal to the
153/1253 controller. Use the standard protocol “A” command to revert back to an analog set
point.
Switch 6: Establishes the RS-232 protocol. When OFF, the protocol is standard. When ON,
the 153/1253 controller uses the portable terminal (PT-1) protocol.
Switch 5: Toggles the parity setting. The OFF setting selects no parity. The ON setting
selects even parity.
Switch 4:
Sets the baud rate. When OFF, the baud rate is 1200. When ON, the baud rate is
9600.
Switch 3: S
elects the end-of-line delimiter. When OFF, the delimiter is a Carriage Return
(CR). When ON, the delimiter is a Carriage Line Feed (CRLF).
Switch 2: Controls the RS-232 compatibility for the set point entry. When OFF, the set point
entry command is Sxxx.x. When ON, the set point entry is S1xxx.x. The extra 1 makes this
entry compatible with other MKS instruments (ex. Types 152, 153A, and 112).
Switch 1:
Selects the set point control action. When the switch is OFF, a zero to full scale set
point produces an open to close valve action (normal control). When ON, a zero to full scale set
point produces a closed to open valve action (reverse control).