MKS Mass-Flo 1479A, Instruction Manual, Page: 30 / 72

Electrical Connections Chapter Three: Overview
20
15-Pin Type “D” Connector
Table 4 lists the pinout of the 15-pin Type “D” connector for the 1479 mass flow controller.
15-Pin Type “D” Connector Pinout
Pin Assignment Pin Assignment
1 MKS Test Point 9 No Connection
2 Flow Signal Output
(0 to +5 VDC)
10 Optional Input
3 Valve Close
(TTL low)
11 Signal Common
4 Valve Open
(TTL low)
12 Signal Common
5 Power Supply Common 13 No Connection
6 -15 VDC 14 No Connection
7 +15 VDC 15 Chassis Ground
8 Set Point Input
(0 to +5 VDC)
Table 4: 15-Pin Type “D” Connector Pinout
Note
1. The “No Connection” pin assignment refers to a pin with no internal
connection.
2. The 0 to 5 VDC flow signal output comes from pin 2 and is
referenced to pin 12 (signal common).
3. Any appropriate 0 to 5 VDC input signal of less than 20K ohm
source impedance referenced to pin 12 can be used to supply a set
point signal to pin 8.