Fluid Components International CMU - Manual (Page 48)

CMM, CMB, CMU with limit circuit and WAGO terminals
For the terminal assignment, see Section 11.5.1 CT connections
Cable glands: See also 10.1 “Installation conditions and cable glands” at page 40.
11.5.3 HART
®
A number of options are available for HART ® communication. However, for all these options loop resis-
tance must be less than the maximum load specified in Section 8.3 Load (on page 39). The HART ® inter-
face is connected via terminal 11 and 12 or 41 and 42 with a minimum load impedance of 250 ohms.
For information regarding operation of the transmitter using the HART
®
hand-held terminal, see “Opera-
tion of the CT transmitter using the HART ® hand-held terminal.”
11.5.4 Communication via SensorPort
SensorPort is the configuration software that is used to operate HART ® or Profibus PA compatible de-
vices.
To connect a desktop or laptop computer to the CT, a HART
® interface is required in addition to commu-
nication software such as SensorPort. The HART ® interface, which has two connections, converts the
levels of the RS 232 interface into an FSK signal (frequency-shift keying). These connections consist of
9-pin sockets at the interface for the RS 232 connection, as well as a two-core cable with two mini termi-
nals for current loop 1 in the transmitter.
The interface can be also installed in a separate control cabinet.
Page 48 of 112
CMU & CT OPERATING MANUAL