Lakeshore Learning Materials 642 - Manual (Page 105)

Lake Shore Model 642 Electromagnet Power Supply User’s Manual
Service 7-13
7.10.4 Power Supply Connector
The Power Supply connector provides the means to connect a water control valve (24 VAC) and an associated water
flow switch (closed during flow) to protect the Model 642 from loss of water flow. Pins 1 & 2 must be closed for normal
operation. Pins 3 & 4 supply 24 VAC at 1 A for operation of a water control valve.
4
1
Pin Name
1 Flow Switch (Com)
2 Flow Switch
3 Power Supply Water Valve A
4 Power Supply Water Valve B
Figure 7-10. Power Supply Connector Details
7.10.5 RS-232C Serial Interface Connector
This connector provides one of two means of computer interface. Command descriptions are found in Section 5.
9
6
5
1
Model 642 Electromagnet Power Supply Typical Computers
DE-9P (DTE) DB-25P (DTE) DE-9P (DTE)
Pin Description Pin Description Pin Description
1 NC 2 TD (out) 1 DCD (in)
2 Receive Data (RD in) 3 RD (in) 2 RD (in)
3 Transmit Data (TD out) 4 RTS (out) 3 TD (out)
4 Data Terminal Ready (DTR out) 5 CTS (in) 4 DTR (out)
5 Chassis-common 6 DSR (in) 5 GND
6 Data Set Ready (DSR in) 7 GND 6 DSR (in)
7 Data Terminal Ready (DTR out) (tied to 4) 8 DCD (in) 7 RTS (out)
8 NC 20 DTR (out) 8 CTS (in)
9 NC 22 Ring in (in) 9 Ring in (in)
Figure 7-11. RS232C (DTE) Connector Details