Digital Output - Seametrics AG3000p Instructions Manual

CONFIGURATION
Analog Output (4-20mA) Configuration. Since the
meter's analog output is isolated and passive, loop power
must be supplied externally as shown previously. (In
addition, an external resistor R
the loop current to voltage for voltage-only input devices.)
The meter's loop transmitter minimum voltage drop is
6Vdc which, with wiring resistance and loop power supply
voltage, will determine the maximum resistance for R
flow rates corresponding to 4 and 20mA can be set by the
user via the SET 4 and SET20 tabs on the meter's setup
menus.
Note: As configured by the factory, any alarm state will
force 22.8mA on the loop. This can be changed to 3.2mA
- see Technical Bulletin, 'iMAG4700/AG3000: Changing the
4-20mA Alarm'.
Modbus Serial Communication Configuration (factory
®
configured). These connections provide a half-duplex,
isolated, RS485 serial communications port using the
Modbus messaging protocol. The TXD connection is the
transmitted data output from the meter and RXD is the
received data input to the meter. See Seametric's Modbus
Interface Description, LT-103393 (available at www.
seametrics.com) for supported Modbus message protocol
and electrical interface specifications.
Digital Output (High Frequency) Configuration.
outputs are electrically similar to the Pulse Output described
above except they are capable of output frequencies up to
Seametrics • 253.872.0284
will be needed to convert
L
. The
L
These
10kHz. The frequency output scaling can be set by the user
via the SETF tab on the meter's setup menus. Selections
are: 500Hz and 1, 2, 5 and 10 KHz at maximum flow rate.
DOUT1 Pulses in forward direction
DOUT2 Pulses in reverse direction
K-Factors for High Speed Digital Output (High Frequency)
Size 500
3" 41.55
4" 23.35
6" 10.38
8" 5.837
10" 3.736
12" 2.594
Page 18
AG3000p INSTRUCTIONS
SETF (Hz)
1K 2K 5K
83.10 166.2 415.51
46.69 93.39 233.5
20.75 41.51 103.8
11.67 23.35 58.37
7.471 14.94 37.36
5.188 10.38 25.94
10K
831.02
466.9
207.5
116.7
74.71
51.88
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