Emerson 3812 User Manual

March 2013

3-9000-765 Rev D

Connectivity protocols

One serial RS-232/RS-485 port (115 kbps baud rate) (Modbus RTU/ASCII)

•

(1) Serial Port A  

(RS-232/RS-485 Full Duplex/RS-485 Half Duplex)

One Ethernet Port (TCP/IP) 100 BaseT 

•

Modbus TCP

Device compatibility

FloBoss 103, FloBoss S600 flow computer, ROC 107 

Digital Input(s) 

(Selectable)

(1) Single polarity (for flow calibration gating - contact closure)

•

Single input for starting and stopping

•

Four pulse configurations available

Analog Input(s) 

(2) 4-20 mA

•

AI-1 Temperature

•

AI-2 Pressure

Note:  The analog-to-digital conversion accuracy is within ±0.05% of full scale over the operating 

temperature range. 

Note:   AI-1 and AI-2 are electronically isolated and operate in sink mode. The input contains a 

series resistance so HART® Communicators can be connected to configure sensors. 

 

A 24 Volt DC power supply is available to provide power to the sensors.