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Modbus & Serial Output Transmitter for Load Cell or Microvolt Input
Powers up to four 350 ohm load cells in parallel. DIN Rail mounted.
Digitally programmable. Exceptional accuracy at high update rates.
Key Features
- 20, 50, 100, 250 & 500 mV full-scale ranges
- 4 or 6-wire hookup to avoid supply and lead resistance effects
- Digital span adjust from 0 to ±99,999
- Digital zero adjust from -99,999 to +99,999
- Accuracy to 0.01% of full scale.
- RS232 or RS485 serial communications, half or full duplex, isolated
- Transmits power factor from 1.000 to 0.000 with sinusoidal signals
- Modbus RTU, Modbus ASCII or Laurel ASCII protocol
- Output update rate to 60/sec
- Easy setup with PC-based Instrument Setup Software
- DIN rail mount housing only 22.5 mm wide
| Analog Input |
Range |
Resolution |
Input Ohms |
| Load Cell |
±20.000 mV
±50.0000 mV
±100.00 mV
±250.00 mV
±500.00 mV |
-99,999 to +99,999
zero adjust,
0 to ±99,999
span adjust |
1 GΩ |
| Microvolt Meter |
±20.000 mV
±50.0000 mV
±100.00 mV
±250.00 mV
±500.00 mV |
1 µV
2.5 µV
5.0 µV
12.5 µV
25 µV |
1 GΩ |
Input Resolution
Input Accuracy
Update Rate, Max
Max Applied Voltage | 16 bits (65,536 steps)
±0.01% of full scale ± 2 counts
50/sec at 50 Hz, 60/sec at 60 Hz.
100 V |
| Transducer Excitation Output (standard) |
Output Levels
Output Isolation |
5V@100 mA, 10 @120 mA, 24V@50 mA (jumper selectable)
50V from signal ground |
| Serial Data Output (standard) |
Signal levels
Data Rates
Output Isolation
Serial Protocols
Devices on RS-485 Line
Modbus Addresses
Modbus Modes
Modbus Compliance |
RS232 or RS485 (half duplex)
300, 600, 1200, 2400, 4800, 9600, 19200 baud
250V rms working, 2.3 kV rms per 1 min test
Modbus RTU, Modbus ASCII, Laurel ASCII (selectable)
32 max without a repeater.
247 max
RTU or ASCII, 2-wire.
Modbus over Serial Line Specification V1.0 (2002) |
| Dual Relay Output (standard) |
Relay Type
Load Rating |
Two solid state relays, SPST, normally open, Form A
120 mA at 130 Vac or 170 Vdc, 28 ohms series resistance |
| Analog Output (standard) |
Output Levels
Compliance, 4-20 mA
Compliance, 0-10V
Output Resolution
Output Accuracy
Output Isolation |
4-20 mA, 0-20 mA, 0-10 Vdc (jumper selectable)
10V ( 0-500 Ω load )
2 mA ( 5 kΩ load or higher)
16 bits (65,536 steps)
0.02% of output span plus conversion accuracy
250V rms working, 2.3 kV rms per 1 minute test |
| Power Input |
Standard Power
Low Power Option
Power Frequency
Power Isolation
Power Consumption |
85-264 Vac or 90-300 Vdc (DC operation not UL approved)
10-48 Vdc or 12-32 Vac
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test
2W typical, 3W with max excitation output |
| Mechanical |
Dimensions
Mounting
Electrical Connections |
129 x 104 x 22.5 mm case
35 mm rail per DIN EN 50022
Plug-in screw-clamp connectors |
| Environmental |
Operating Temperature
Storage Temperature
Relative Humidity
Cooling Required | 0°C to 55°C
-40°C to 85°C
°C, non-condensing
Mount transmitters with ventilation holes at top and bottom.
Leave 6 mm (1/4") between transmitters, or force air with a fan. |
Pinout
Laureate Modbus & Serial Output Transmitter, Load Cell or Microvolt Input
Load Cell Transmitter Connections
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In 4-wire connection, the excitation and sense lines are tied together. The meter can make ratiometric corrections for supply voltage variations, but not compensate for variations in lead resistance. This connection is often used with short cable runs. |
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In 6-wire connection, the sense lines are separate from the excitation lines, thereby eliminating effects due to variations in lead resistance. This allows long cable runs in outdoor environments with temperature extremes. |
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For large scales, up to four 350 ohm load cells in parallel can be powered by a single Laureate transmitter at 5V excitation. The excitation and sense points of the four bridges are connected in parallel through a summing box. |
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