CLMod – RS485 to current loop converter

Overview

CLMod is an RS485 to 20 mA current loop converter. CLMod can remotely gather data from electricity meters. This converter was developed to read multiple meters of data over a 20mA current loop interface with long-distance lines up to 2km. CLMod with 6 current loop interfaces is capable of reading data up to 30 meters (5 meters per single current loop). CLMod is protocol agnostic you can use any type of serial protocol.

Features

6 independent 20mA current loop interfaces
Galvanic 3kV(rms) isolation
LED indication of data transmission on every current loop interface
Supports 5 meters per current loop (30 meters total)
Baud rates: 1200 to 9600
Automatic open-loop detection and disconnection
Fail indication for each current loop
Integrated current loop protection
Compatible with Elgama Elektronika meters
RS485 interface for RTU/Datalogger
Operating temperature: -40°C +80°C
Dimension 101x119x17.5mm

Communication

Communication standard: RS485
Communication protocol: Modbus (RTU), DLMS/Cosem and IEC 62056-21
Speed: 1200 – 9600 baud

Electrical characteristics

Termination resistor: Software selectable, 120Ω
Power supply: 24VDC / 21.6-26.4VDC (full range)
3kV galvanic isolation with isolated DC/DC power supply inside(RS485 and power supply is isolated from current loop interfaces)
Integrated current loop protections:
- Rated current: 0,2A
- Max pulse discharge current (8/20 µs): 10kA
- Reaction time in µs: 1

Specifications

Device data
Article number	CLMOD
Product description	RS485 to current loop converter. With 6 independent current loop 20mA interfaces.
Configuration software	Not required
Warranty	2 years
Interfaces and functions
Meter interfaces	6 independent current loop interfaces (20mA)
interface capacity	5 meters per interface (where voltage drop per meter <2VDC)
Total meters	up to 30 (6×5 meters)
Interface protection	>3 kV individual isolation of each interface
Max pulse discharge current	up to 10kA (8/20 µs)
Reaction time	>=1µs
Cut off current	> 200mA
Max input voltage	33 VDC
Interface and communication
RS485 interface	ANSI/TIA/EIA-485-A-1998
Communication protocols	Protocol agnostic (transparent) tested with: – Modbus RTU; – DLMS/COSEM; – IEC 62056-21; – IEC 62056-31.
Baudrate	1200 – 9600
Parity	None, Even, Odd
Terminating resistors	120 Ohm (configurable)
Current loop interface	6 independent interfaces
Galvanic isolation	3 kV
Max distance	<2 km per interface
Max meters	up to 5 meters per interface
Protection	on every current loop interface independent
Power supply
Auxiliary power supply	9-33VDC (full range)
Power consumption	40mA @ 12VDC, 20mA @ 24 VDC
Insulation voltage	3 kV
Operating conditions
Operating temperature	-40°C … 55°C
Storage temperature	-40°C … 85°C
Relative humidity	max. 95 % (non condensing)
Protection class	IP20
Dimensions and installation instructions
Case height x width x depth	119 x 17.5 x 101 mm
Installation type	DIN Rail mounting