I/O and digital communication for Model 1700 transmitters (continued)Table 11-2:
Description
Model 1700
with output
code
A D
HART/RS-485, Modbus/RS-485:
• One RS-485 output can be used for direct connection to a HART or Modbus
host system; accepts data rates between 1200 baud and 38.4 kilobaud
• HART revision 5 as default, selectable to HART revision 7
✓
(3)
HART/Bell 202:
• HART Bell 202 signal is superimposed on the primary milliamp output, and is
available for host system interface. Frequency 1.2 and 2.2 kHz, Amplitude: to
1.0 mA, 1200 baud, Requires 250 to 600 ohms load resistance
• HART revision 5 as default, selectable to HART revision 7
✓ ✓
(1) If communicating with HART a minimum of 250 ohms and 17.75 V supply is needed .
(2) Absolute minimum = 100 ohms for V
supply
< 25.6 volts.
(3) Except when ordered with display code 8
I/O and digital communication for Model 2700 transmittersTable 11-3:
Description
Model 2700 with
output code
A
2
B
C
3
D
4
E
G N
• One active 4–20 mA output, not intrinsically safe:
- Isolated to ±50 VDC from all other outputs and Earth ground
- Maximum load limit: 820 ohms
- Can report mass flow, volume flow, density, temperature, or drive gain
- Output is linear with process from 3.8 to 20.5 mA, per NAMUR NE43
Version 03.02.2003
• One active frequency/pulse output, not intrinsically safe:
- Can report mass flow or volume flow, which can be used to indicate
flow rate or total
- Independent of mA output
- Scalable to 10,000 Hz
- Voltage is +24 VDC ±3% with 2.2 kohm internal pull-up resistor
- Linear with flow rate to 12,500 Hz
- Configurable polarity: active high or active low
- Can be configured as a discrete output to report five discrete events,
flow direction, flow switch, calibration in progress, or fault.
✓
Specifications
Installation Manual 107
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