Lake Shore Model 370 AC Resistance Bridge User’s Manual ! " #Alarm Relays.bmp Temrinal Block.epsPin Description123456LNO Low Alarm Relay Normally OpenLCOM Low Alarm Relay CommonLNC Low Alarm Relay Normally ClosedHNO High Alarm Relay Normally OpenHCOM High Alarm Relay CommonHNC High Alarm Relay Normally ClosedFigure 8-10. ALARM RELAYS Terminal BlockSerial Connector.bmpModel 370 AC Resistance Bridge Typical ComputersDE-9P (DTE) DB-25P (DTE) DE-9P (DTE)Pin Description Pin Description Pin Description1 No Connection 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 Ground (GND) 6 DSR (in) 5 GND6 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 No Connection 20 DTR (out) 8 CTS (in)9 No Connection 22 Ring in (in) 9 Ring in (in)Figure 8-11. RS-232 (DTE) Connector DetailsService 8-13
