FlexStat (General)
6
Application Guide, Rev L
IN4
IN3
GND
IN2
NOTE: Custom programming is required
Inputs
250 ohms
4–20
mA DC
(–)
(+)
4–20 mA Current Input
To use a
4–20 mA current input
:
1. Connect an
external
250 ohm resistor from input to ground. (Do not
install the resistor inside the FlexStat’s case since the heat generated
by the resistor may skew the temperature readings.) The resistor
converts the 4–20 mA current input to a 1–5 VDC voltage that can be
read by the thermostat’s analog-to-digital converter.
2. Set the corresponding pull-up switches to the
0–12 VDC
position.
3. Using BACstage or TotalControl, configure the input device type for a
4–20 mA source.
1
2
3
4
5
6
3
4
3
4
IN4 =
5
6
10K
Ω
0-12 V
5
6
IN3 =
7
8
7
8
IN2 =
7
8
EOL =
Pushed Left
Pushed Right
1
2
ON
OFF
1
2
10K
Ω
0-12 V
10K
Ω
0-12 V
Analog Input Configuration (in BACstage)
External 250 Ohm Resistor for 4–20 mA Current Inputs
Input Pull-Up Switches Set to 0–12 VDC
