MKS Instruments UK Ltd
Cirrus2 Hardware Manual – SP101017.100 June 2011
15
Digital I/O Connector
See Interfacing Notes on Page 16 before making connections to this interface.
A standard 25-way D-type socket used for interfacing with external equipment. This may be already in use depending on
the type of RGA system purchased, otherwise it is used to connect accessories such as a Remote Vacuum Controller.
The Digital I/O connector can also be used to provide alarm output signals and process trip signals.
This interface offers the following functionality:
16 configurable I/O lines
+3.3V power output fused at 120mA, fuses are self resetting
±
15V power output fused at 120mA, fuses are self resetting
+24V power output fused at 120mA, fuses are self resetting
Note: The total power consumption on each rail (+3.3V,
±
15V & +24V) for both the Analog and Digital I/O ports must not
exceed 120mA.
Pin
Function
Description
1
Multiplier Trip
Dedicated to Multiplier Trip
2
PA1
3
PA3
4
PA5
5
PA7
6
PB1
7
PB3
8
PB5
9
PB7
10
0V Digital
11
0V Analogue
12
-15V
-15V supply output, fused at 120mA
13
+15V
+15V supply output, fused at 120mA
14
PA0
15
PA2
16
PA4
17
PA6
18
PB0
19
PB2
20
PB4
21
PB6
22
+3.3V fused
+3.3V supply output, fused at 120mA
23
Not Connected
24
GND
25
+24V
+24V supply output, fused at 120mA
