real time control systems, Modbus RTU devices, low cost I2C I/O modules, free BASIC compiler software, motor controllers, controllers with color graphic displays

Microva Modbus RTU modules are factory configured as Modbus server (slave) devices and do not require programming or even connecting to a computer for device installation. They are designed to be mounted side-by-side and connected over a ribbon cable as shown below. Use the MB102 module to connect several modules to the Modbus RTU network. The individual module node number, data format and baud rate can be configured using the PGM switch on the PCB by counting the number of blinks of the green LED. See the device data sheet for the flow chart. Those settings can also be changed over the Modbus network using the free Microva BASIC compiler software which includes a simple Modbus network interface for reading or writing to any Modbus RTU devices on the network- whether they are made by Microva or other manufacturers. Microva Modbus RTU devices can also be programmed to be stand alone Modbus client (master) controllers using the Microva BASIC programming software.

MB122 Two Analog Inputs, Two 4/20mA Outputs, Two Logic Outputs

Data Sheet

• RS-485 with Modbus RTU
• two 4/20mA or 0/10V inputs
• two 4/20mA outputs
• two logic outputs
• industrial range power supply

MB123 Two Logic Inputs,
Two Output Relays

Data Sheet

• RS-485 with Modbus RTU
• two logic inputs
• two relay outputs with LED status
• industrial range power supply

MB127 Isolated mV Input With Programmable Gain and
Isolated 4/20mA Input

Data Sheet

• RS-485 with Modbus RTU
• isolated mV input
• programmable gain amplifier
• amperometric sense input resistors
• isolated 4/20mA input
• industrial range power supply

MB128 Isolated High Impedence mV Input, Isolated Resistive Sensor Input, Two 4/20mA Inputs

Data Sheet

• RS-485 with Modbus RTU
• isolated high impedence mV input
• mV input optimized for pH/ORP sensors
• isolated resistive sensor input
• reads water temperature with thermistor
• two 4/20mA inputs
• industrial range power supply

MB129 Two Isolated 4/20mA Inputs, Two Isolated 0/10V Inputs,
Isolated 24V Output Power Supply

Data Sheet

• RS-485 with Modbus RTU
• two isolated 4/20mA inputs
• two isolated 0/10V inputs
• isolated 24V output for powering sensors
• over current protection for sensors
• industrial range power supply

MB124 Two Analog Inputs, Two 4/20mA Outputs, Two Output Relays

Data Sheet

• RS-485 with Modbus RTU
• two 4/20mA or 0/10V inputs
• two 4/20mA outputs
• two relay outputs with LED status
• industrial range power supply

MB181 Eight Opto-Isolated Inputs With
Counters and Pulse Rate Measurement

Data Sheet

• RS-485 with Modbus RTU
• eight opto-isolated inputs
• up to four counters
• up to four pulse rate measurements
• inputs can source or sink current
• industrial range power supply

MB130 Isolated Conductivity Probe and Isolated Resistive Sensor Inputs

Data Sheet

• RS-485 with Modbus RTU
• isolated conductivity probe input
• isolated resistive sensor input
• reads water temperature with thermistor
• industrial range power supply

MB141 Thermocouple Input,
Two Resistive Sensor Inputs,
One Output Relay

Data Sheet

• RS-485 with Modbus RTU
• thermocouple input with fault detection
• reads all common thermocouple types
• two resistive sensor inputs
• reads thermistors, pots, LDRs, others
• one relay output with LED status
• industrial range power supply

MB122 Two Analog Inputs, Two 4/20mA Outputs, Two Logic Outputs

MB123 Two Logic Inputs,
Two Output Relays

MB114 Four 4/20mA Outputs

MB127 Isolated mV Input With Programmable Gain and
Isolated 4/20mA Input

MB128 Isolated High Impedence mV Input, Isolated Resistive Sensor Input, Two 4/20mA Inputs

MB129 Two Isolated 4/20mA Inputs, Two Isolated 0/10V Inputs,
Isolated 24V Output Power Supply

MB124 Two Analog Inputs, Two 4/20mA Outputs, Two Output Relays

MB181 Eight Opto-Isolated Inputs With
Counters and Pulse Rate Measurement

MB130 Isolated Conductivity Probe and Isolated Resistive Sensor Inputs

MB141 Thermocouple Input,
Two Resistive Sensor Inputs,
One Output Relay

MB104 Four Output Relays

MB108 Eight Output Relays

MB122 Two Analog Inputs, Two 4/20mA Outputs, Two Logic Outputs

MB123 Two Logic Inputs, Two Output Relays

MB114 Four 4/20mA Outputs

MB127 Isolated mV Input With Programmable Gain and Isolated 4/20mA Input

MB128 Isolated High Impedence mV Input, Isolated Resistive Sensor Input, Two 4/20mA Inputs

MB129 Two Isolated 4/20mA Inputs, Two Isolated 0/10V Inputs, Isolated 24V Output Power Supply

MB124 Two Analog Inputs, Two 4/20mA Outputs, Two Output Relays

MB181 Eight Opto-Isolated Inputs With Counters and Pulse Rate Measurement

MB130 Isolated Conductivity Probe and Isolated Resistive Sensor Inputs

MB141 Thermocouple Input, Two Resistive Sensor Inputs, One Output Relay

MB104 Four Output Relays

MB108 Eight Output Relays

MB123 Two Logic Inputs,
Two Output Relays

MB127 Isolated mV Input With Programmable Gain and
Isolated 4/20mA Input

MB129 Two Isolated 4/20mA Inputs, Two Isolated 0/10V Inputs,
Isolated 24V Output Power Supply

MB181 Eight Opto-Isolated Inputs With
Counters and Pulse Rate Measurement

MB141 Thermocouple Input,
Two Resistive Sensor Inputs,
One Output Relay