ECO Meter Pinouts

ECO sensors use am MCBH-6-MP bulkhead connector. Input power of 7–15 VDC is applied to pin 4. The power supply current returns through the common ground pin. The input power signal has a bi-directional filter, which prevents external power supply noise from entering the ECO. It also prevents internally generated noise from coupling out onto the external power supply.

WARNING!
If you are going to build or use a non-WET Labs-built cable, do NOT use the wire from pin 3 or the meter will be damaged.

ECO bulkhead connector diagram

Pin	Function	Diagram
1	Ground
2	RS-232 RX
3	Reserved
4	V in
5	RS-232 TX
6	Analog out

ECOs with internal batteries have a second bulkhead connector that comes with a jumper plug (marked with blue rubber coating) to supply power to the unit.

ECO with internal batteries bulkhead connector diagram

Socket	Function	Diagram
1	V in
2	N/C
3	Battery out