15-Pin Accessory Connector (Optional) Pinout - Thermo NESLAB HX 150 Service Manual

15 pin Accessory
Connector (Optional)
Units with digital controllers may be modified with a 15 pin accessory
connector. To enable the connector slide the LOCAL/REMOTE switch on the
temperature controller to the REMOTE position. The pin out information is
listed below.
8 7 6
15 14
15 pin D-subminiature female receptacle
Pin # Function
1 Chassis ground.
2 No connection.
3 Span +. Indicates the maximum setpoint value the unit can be set
to operate. The temperature scale is 10mV/°C, referenced to analog
ground, pin 6(example: +350mV = +35.0°C).
4 Span -. Indicates the minimum setpoint value the unit can be set
to operate.
analog ground, pin 6 (example: +50mV = +5.0°C).
5 No connection.
6 Analog ground. The analog ground is physically separated from
the power ground throughout the unit. To prevent offsets that result from
ground currents, the analog and power grounds are only connected at the
unit's power supply. Analog ground should only be used as a reference pin .
7 Sensor temperature (current limited through 2.7K OHM resistor).
The fluid temperature, as measured by the controller's sensor located in the
reservoir, can be read at this pin. The temperature scale is 10mV/°C,
referenced to analog ground, pin 6 (example: +150mV = +15.0°C).
8 Setpoint out. The present temperature setpoint can be read at
this pin. The temperature scale is 10mV/°C, referenced to analog ground, pin
6 (example: +150mV = +15.0°C).
9 Power Ground.
10 Heater output. Will source 3V at 6mA.
11 No connection.
12 Digital display (input only). An external voltage can be displayed
on the operator panel digital display by applying the voltage to this
pin. The display has a low input resistance and a full scale rating of
±1.99VDC. Input is referenced to analog ground, pin 6. The maximum
voltage applied to the display should be limited to 2VDC.
13 - 5V. Power supply of -5VDC (15mA maximum).
14 +5V. Power supply of +5VDC (15mA maximum).
15 Setpoint in. The temperature setpoint can be controlled by
applying a known voltage to this pin. The temperature scale is 10mV/°C,
referenced to analog ground, pin 6 (example: +230mV = +23.0°C).
50
5 4 3 2 1
13 12 11 10 9
The temperature scale is 10mV/°C, referenced to