RFT9739 Rack-Mount Transmitter Instruction Manual
85
RFT9739 Specifications
continued
Optocoupler output
The optocoupler is an externally powered output. Signal voltage: low
level 0-2 VDC, high level 16-30 VDC. Maximum signal current 0.01 amp.
Maximum capacitive load 150 nF at 10 kHz. Output is derived from the
primary frequency, and represents the same process variable as the
frequency/pulse output. The output complies with VDE/VDI 2188.
Control
One control output can represent flow direction, fault alarm, zero in
progress, event 1 or event 2. Internally powered, digital level, 0 or 15 V,
2.2 kohm pull-up, galvanically isolated to ±50 VDC. In open collector
configuration: sinking capability, 0.1 amps in "on" condition (0 volt level),
30 VDC compliance in "off" condition.
Communication
Switch allows selection of preset or user-defined settings.
• Default preset-settings: HART protocol over Bell 202, on the primary
mA output, 1200 baud; Modbus protocol in RTU mode, on the RS-485
output, 9600 baud; 1 stop bit, odd parity.
• Default user-defined settings: HART protocol, on the RS-485 output,
1200 baud, 1 stop bit, odd parity.
Bell 202 signal is superimposed on primary variable mA output, and
available for host system interface. Frequency 1.2 and 2.2 kHz,
amplitude 0.8 V peak-to-peak, 1200 baud. Requires 250 to 1000 ohms
load resistance.
RS-485 signal is a ±5 V square wave referenced to transmitter ground.
Baud rates between 1200 baud and 38.4 kilobaud can be selected.
Additional outputs
Sensor frequency
For use with Micro Motion peripheral devices, 8 V peak-to-peak at
sensor natural frequency, referenced to sensor ground, 10 kohm output
impedance.
Sensor temperature
For use with Micro Motion peripheral devices, 5 mV/°C, referenced to
signal ground, 10 kohm output impedance.
Summary of Contents for Fisher Rosemount RFT9739
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