Modbus Emulation
Part No.: 4417589_Rev13 Protocol Manual - CIU Emulation
CIU 888 3 - 3
Modbus Slave and Modbus Emulation (see figure 3-2). Refer to
Table 3-1 for more details on Modbus mode property.
FIGURE 3-2 Modbus Emulation - Service Tool
3.1.2 Modbus Mode
When host port is configured for Modbus RTU protocol, Modbus Mode
property indicates the operation mode for the host port. Refer to the
Table 3-1 for the supported operation modes.
TABLE 3-1 Modbus Operation Modes
Modbus Mode Description
Modbus Slave This mode is used when Entis Pro, other DCS /
SCADA / PLC is connected to CIU 888 and request-
ing for tank data.
This is CIU 880 compatible Modbus mode. In this
mode, CIU 888 acts a Modbus slave and services the
Modbus requests similar to that of CIU 880.
Modbus Emulation This mode is used when TankMaster Winsetup is
connected to CIU 888 to service Emerson Rex
gauges.
In this mode, CIU 888 acts as a transparent Modbus
tunnel and passes all the Modbus requests from
TankMaster Winsetup to the field Emerson Rex
gauges.
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