Sierra Instruments Instruction Manual
Smart-Trak
®
2 Series 100
20
Analog Output Signals:
•
Output Signal—Voltage:
Measure the voltage output signal across the red (pin 2)
wire and any of the analog grounds: brown (pin 1), orange (pin 3) or gray (pin 10).
The minimum load is 1000 Ohms. We recommend pin 1. DO NOT USE THE SAME
ANALOG GROUND FOR CURRENT OUTPUT, SETPOINT OR RS232.
•
Output Signal—Current:
Measure the current output signal, 4-20 mA or 0-20 mA,
across the red/white stripe (pin 14) wire and any of the analog grounds: pin 1, 3, or
10. The maximum load is 500 Ohms. We recommend pin 1. DO NOT USE THE
SAME ANALOG GROUND FOR VOLTAGE OUTPUT, SETPOINT OR RS232.
For Mass Flow Controllers, the following analog features are also
available at the HD DB-15 connector:
Setpoint:
To transmit an analog setpoint, supply the voltage or current signal (check
the data label and/or setting) across the blue (pin 8) wire and pin 10.
Valve Close
: To force the valve closed, connect the black (pin 12) wire to pin 10
Purge:
To force the valve to its maximum open position which we call “Purge,”
connect the pink (pin 4) wire to the white (pin 11) wire. Note that this will allow
much greater flow than the rated full-scale value.
For Digital Communication Using Your Personal Computer:
You can communicate with your instrument using the Smart-Trak 2 Software
package and
your PC running the Windows operating system. Simply connect the light green (pin 7)
wire, the brown/white stripe (pin 13) wire and one of the analog grounds (pin 1,3, or 10)
to a standard DB-9 connector according to Figure 2-6: Digital Communication.
Figure 2-6: Digital Communication
RS-232 Transmit (pin 7)
to
DB-9 pin #2
RS-232 Receive (pin 13)
to
DB-9 pin #3
Analog ground (pin 3)
to
DB-9 pin #5