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SIT SITRANS RD300RANS RD300
Page 100
SITRANS RD300 – OPERATING INSTRUCTIONS
A5E31917845
Isolated 4-20 mA Transmitter Output
OUTPUT
SOURCE
Rate/process, total, grand total, max, min, set points 1-8, or
manual control mode
SCALING RANGE
1.000 to 23.000 mA for any display range.
CALIBRATION
Factory calibrated: 4.000 to 20.000 = 4-20 mA output
ANALOG OUT
PROGRAMMING
23.000 mA maximum for all parameters:
Overrange, underrange, max, min, and break
ACCURACY
± 0.1% FS ± 0.004 mA
TEMPERATURE
DRIFT
0.4 µA/
C max from 0 to 65
C ambient,
0.8 µA/
C max from -40 to 0
C ambient
Note: Analog output drift is separate from input drift.
ISOLATED
TRANSMITTER
POWER SUPPLY
Terminals I+ & R: 24 VDC
10%. May be used to power the
4-20 mA output or other devices. All models rated @ 40 mA
max.
EXTERNAL LOOP
POWER SUPPLY
35 VDC maximum
OUTPUT LOOP
RESISTANCE
Power supply
Minimum
Maximum
24 VDC
10
700
35 VDC (external)
100
1200
Modbus
®
RTU Serial Communications
SLAVE ID
1 – 247 (Meter address)
BAUD RATE
300 - 19,200 bps
TRANSMIT
TIME DELAY
Programmable between 0 and 199 ms
DATA
8 bit (1 start bit, 1 or 2 stop bits)
PARITY
Even, Odd, or None with 1 or 2 stop bits
BYTE-TO-BYTE
TIMEOUT
0.01 – 2.54 second
TURN AROUND
DELAY
Less than 2 ms (fixed)
Note: Refer to the SITRANS RD300
Modbus Register Tables located at
www.siemens.com for details.