Modbus Gateway

Modbus Gateway (1)

AKCP’s family of sensor and control systems developed over the last 30 years are widely used in industrial applications. Anywhere you need to monitor sensors and control systems our network enabled devices are the first choice.

The sensorProbe+ series is a cost effective and robust solution that can act as a Modbus RTU <-> TCP/IP as well as Modbus RTU or TCP/IP <-> SNMP gateway. It can function as either Master or Slave through the addition of the optional Modbus EXP port on all SP2+ and SPX+ units.


Modbus Gateway is available on both the SPX+ and the SP2+ base units.

sensorProbeX+ (SPX+) comes in a variety of standard configurations to suit your monitoring needs. Additional modules can be added or a complete custom unit can be built so you get only the features you want. Add a Modbus EXP port to monitor third party Modbus devices. 

sensorProbe2+ (SP2+) is a compact device, with 4 sensor ports and Modbus TCP/IP support. Upgrade to the SP2+X and change 1 sensor port to an Expansion port which supports Modbus RTU.


General Specifications  
Modbus RTU Modbus RTU connects through the Expansion port (EXP) as a 2-wire connection.
Speed 9600, 19200, 38400, 57600 and 115200
Parity None, Even, Odd
Stop Bit 1, 2
Databit 8
Modbus TCP/IP  
Host IP Address
Port 502, 1024-65535
Modbus Slave  
  Support Modbus Slave RTU and TCP/IP
  Can poll up to 32 values with Virtual sensors and up to 3 PMS.
Functions 0x01 - Read Coil Status
  0x02 - Read Input Status
  0x03 - Read Holding Registers
  0x04 - Read Input Registers
Data Type 16 bits unsigned int
  16 bits signed int
  32 bits unsigned int
  32 bits signed int
  32 bits IEEE floating point
Data ordering low byte first, low word first
  low byte first, high word first
  high byte first, high word first
  high byte first, low word first
Power Meter Sensor (PMS)
The SPX+ and SP2+ include a specific interface to online up to three AKCP's Power Meters via Modbus RTU
  3rd Party Power Meters support is also possible but requires the purchase of a licences.
Modbus Notifications The SPX+ and SP2+ support Modbus Write commands via the Notification feature *
Functions 0x05 - Write Single Coil
  0x06 - Write Single Register
  0x0F - Write Multiple Coils (32 bits maximum)
  0x10 - write Multiple Registers (2 registers maximum)
  * Feature available soon
Modbus Master  
  Support Modbus Master RTU and TCP/IP
Functions 0x03 - Read Holding Registers : 32 bits IEEE floating point value
  0x04 - Read Input Registers : 32 bits signed int value
Register Address List All sensors monitored by the SPX+ or SP2+ have a Modbus register automatically assigned, and the user can edit the Modbus register assigned to the sensors.
  The register list can be consulted on the unit's WebUI page, in System >> Modbus