Modbus digital input and output points

Modbus digital point syntax

Telem_Server_<ScopeName>:%<OutstationFullName>;<PointType>;<PointAddress>;<BitOffset>;<BitCount>{;[<PointName>]}

• PointType: DI or DO

• PointAddress: a 5 or 6 digit decimal number, depending on the Point Address Range setting of the outstation, which is set through the Telemetry Server dashboard. The default setting is 5 digits. The range of valid addresses vary by point type and maps to the "Address" field in the Telemetry Server dashboard.

• BitOffset: a decimal number between 0 and 15. This number maps to the "BitOffset" field in the Telemetry Server dashboard. The maximum offset varies and depends on the bit count.

• BitCount: a decimal number between 1 and 3. This number maps to the "BitCount" field in the Telemetry Server dashboard.

• PointName (optional): a descriptive name for the point, for example, LiftStationPump_01. If specified, the PointName must be enclosed in brackets. If point name is not specified, the point is assigned a default name that uses point type and point address, in the format PointType_PointAddress, for example, DI_30001.

  • If PointName is not specified, the point is assigned a default name that uses point type and number, in the format PointType_PointAddress, for example, DI_30001.

  • If you want to create the new point in a different group than the Outstation group, include the group name: GroupName.PointName.

Digital reference examples

Without optional PointName:

Telem_Server_<ScopeName>:%Group.Modbus_RTU;DI;30001;0;1

References the 1-bit digital input point mapped to the least significant bit of input register 30001, which is given the name DI_30001

With optional PointName:

Telem_Server_<ScopeName>:%Group.Modbus_RTU;DI;30001;0;1;[Tag_Name]

References the 1-bit digital input point mapped to the least significant bit of input register 30001, which is named Tag_Name