SPECIFICATIONS
Except where noted all specifications apply to operation at +25°C.
General

Input/Output: Modbus RTU RS-485
Display: 0.56" (14.2 mm) red LED, 6 digits; displays from -199999 to 999999, automatic leading zero blanking
Display Intensity: Eight user selectable intensity levels
Decimal Point: Up to five decimal places: d.ddddd, dd.dddd, ddd.ddd, dddd.dd, ddddd.d, or dddddd
Front Panel: NEMA 4X, IP65; panel gasket provided
Programming Methods: Four front panel buttons or via Modbus registers (Slave mode only)
Scaling: Input may be scaled from -199,999 to 999,999
Function: Linear, square root, or programmable exponent from 0.50000 to 2.99999
Multi-Point Linearization: 2 to 16 points
Noise Filter: Programmable 2 to 199 (0 will disable filter)
Bypass: 0.2 to 99.9% of full-scale
Cutoff: 0 to 999999; 0 disables cutoff
Display Update Rate: Master: 10/sec to 1 every 25.5 seconds;
Slave: Dependent on master device (PLC, DCS, etc)
Overrange: Display flashes 999999
Underrange: Display flashes -199999
Max/Min Display: Stored until reset by user or meter is turned off; user can reset by front panel buttons or via Modbus registers.
Password: Restricts modification of programmed settings.
Non-Volatile Memory: Settings stored for a minimum of 10 years.
Power Options: 85-265 VAC, 50/60 Hz; 90-265 VDC, 20 W max or 12-36 VDC; 12-24 VAC, 6 W max.
Required Fuse: UL Recognized, 5 A max, slow-blow; up to 6 meters may share one fuse.
Normal Mode Rejection: 64 dB at 50/60 Hz
Transmitter Supply: Isolated 24 VDC ±10% @ 200 mA max
Isolation: 4 kV input/output-to-power line, 500 V input-to-output or output-to-24 VDC supply
Operating Temperature: 0 to 65°C
Storage Temperature: -40 to 85°C
Relative Humidity: 0 to 90% non-condensing
Connections: Removable screw terminals accept 12 to 26 AWG
Enclosure: 1/8 DIN, high impact plastic, UL 94V-0, color: gray
Weight: 9.7 oz (275 g) (including options)
UL File Number: E160849; 508 Industrial Control Equipment
Warranty: 3 years parts & labor
Extended Warranty: 1 or 2 years, refer to Price List for details.

Operating Modes
Master: Processes data read from a Modbus RTU slave device (only one parameter at a time can be programmed for reading).
Slave: Processes data sent from a Modbus RTU master device
Note that the relays and the 4-20 mA output are functional in either mode.

Master Mode Settings
Function Code: Select which Modbus function code (03 or 04) to use
Register Number: 1 to 65536. Specifies which register(s) to read in the slave device. Register number is preceded by register type (3xxxxx or 4xxxxx). Five or six digit register number allowed.
Data Type: Select the data format that the slave device uses; select between
Short (2 byte) and Long (4 byte), Integers or Floating point (4 byte), Signed or Unsigned (integer only), and byte order (big-endian vs little-endian).
Slave Response Timeout: 0 to 25.5 seconds, limited by Poll Time value. This is the time allowed for slave to respond to a command.
Poll Time: 0.1 to 25.5 seconds between read commands.


Relays
Rating: 2 Form A (SPST) standard; 2 Form C (SPDT) optional; rated 3 A @ 30 VDC or 3 A @ 250 VAC, resistive loads
High or Low Alarm: User may program any alarm for high or low
Deadband: 0-100% FS, user selectable
Relay Operation:
   1. Automatic (non-latching)
   2. Latching
   3. Pump alternation control (up to 4 relays)
Relay Reset: Selectable via front panel or Modbus registers
   1. Automatic reset only (non-latching)
   2. Automatic plus manual reset at any time (non-latching)
   3. Manual reset only, at any time (latching)
   4. Manual reset only after alarm condition has cleared (latching)
Automatic Reset: Relays reset when input passes the reset point
Manual Reset: Front panel button, Modbus registers (Slave only)
Time Delay: 0 to 199 seconds, on and off delays, programmable and independent for each relay
Fail-Safe Operation: Programmable, independent for each relay
Communications Break: No change, Relay on, or Relay off. Controls the condition the relay goes to when a slave device does not reply (Master mode only).
Auto Initialization: When power is applied to the meter, relays will reflect the state of the input to the meter.


Serial Communications
Compatibility: EIA-485
Protocol: Modbus RTU
Address: 1 to 247. Specifies the address of the slave device (Master mode) or the address of the PD865 (Slave mode).
Baud Rate: 300 to 19,200 bps
Data: 8 bits (1 start bit, 1 stop bit; 1 or 2 stop bits with no parity)
Parity: None, even, or odd
Byte-to-Byte Timeout: 0.01 to 2.54 seconds
Turn Around Delay: Less than 2 ms (fixed)


Isolated 4-20 mA Transmitter Output
Scaling Range: 1.000 to 23.000 mA; reverse scaling allowed.
Calibration: Factory calibrated 4.000 to 20.000 mA
Accuracy: ±0.1% FS ±0.004 mA
Recalibration: Recommended at least every 12 months.
Temperature Drift: 50 PPM/°C
Transmitter Supply: Isolated 24 VDC ±10% @ 200 mA max
Isolation: 500 V input-to-output or output-to-24 VDC supply; 4 kV output-to-power line
External Loop Power Supply: 35 VDC maximum
Output Loop Resistance:

	Loop Resistance
Power Supply	Minimum	Maximum
24 VDC	10 Ω	700 Ω
35 VDC (external)	100 Ω	1200 Ω

Data Source: Display value, maximum display value, minimum display value, or Modbus register
Overrange: Programmable mA output for overrange condition
Underrange: Programmable mA output for underrange condition
Communications Break: Programmable mA output when a slave device does not reply within the Slave Response Timeout
Maximum Output: Programmable absolute maximum mA output
Minimum Output: Programmable absolute minimum mA output


Disclaimer
The Information contained in this document is subject to change without notice. Precision Digital Corporation makes no representations or warranties with respect to the contents hereof, and specifically disclaims any implied warranties of merchantability or fitness for a particular purpose.

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