Laurel Electronics Ethernet-to-RS485 Converter Board for Laurel Electronics 1_8 DIN Instruments - Manual (Page 2)

LAUREL ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 2
The Modbus TCP protocol is fully supported. Conversion to
Modbus TCP is provided transparently by Laurel Nodes so
that an Ethernet application program can use the Modbus TCP
protocol while the meters use the Modbus RTU or Modbus ASCII
protocol. The Laurel ASCII protocol, which supports up to 31
digital addresses, can also be used if the only devices on the
data line are Laureate meters.
Instruments from other manufacturers can be operated on
the RS485 bus under control of our LTNET485 Ethernet-to-Serial
Device Server if the host computer supplies commands and
accepts responses suitable for these instruments.
The Ethernet-to-RS485 Converter Board can be ordered as
an option for Laurel digital panel meters, counters and timers.
It cannot be ordered as a stand-alone product.
Laurel's separate Ethernet board can be used as an alternative
to the server board for connecting meters to a network. Each
meter will then need to be connected to the network via an
Ethernet router, switch or hub, and its own Ethernet cable.
Electrical Specifications
Ethernet Board Specifications
Data rates
Devices per Ethernet line
Ethernet connector
Ethernet cable
Ethernet compliance
Devices per RS485 line
RS485 connector
RS485 compliance
Isolation
ESD Protection
EMI Immunity
EFT Protection
Short Circuit Protection 300, 600, 1200, 2400, 4800, 9600, 19200 bps
1 Node plus up to 31 on RS485 bus
RJ45 jack
10/100Base-T
IEEE 802.3
Up to 31 including the host meter
RJ11 jack
EIA/TIA-485
250V rms working, 2.3 kV rms per 1 min test
15 kV per IEC 1000-4-2
10 V/m per IEC 1000-4-3
2 kV per IEC 1000-4-4
Continuous
Protocol Specifications (implemented on the meter main board)
Modbus RTU
Standards Compliance
Data Formats (selectable)
Applicable Interface Boards
Conversion to Modbus TCP Modbus over Serial Line Specification V1.0 (2002)
1. No parity, 8 data bits, 2 stop bits
2. Odd parity, 8 data bits, 1 stop bit
3. Even parity, 8 data bits, 1 stop bit
Ethernet, USB, RS232, RS485, RS485 Modbus
Automatic
Modbus ASCII
Standards Compliance
Data Formats (selectable)
Applicable Interface Boards
Conversion to Modbus TCP Main Modbus over Serial Line Specification V1.0 (2002)
1. No parity, 7 data bits, 2 stop bits
2. Odd parity, 7 data bits, 1 stop bit
3. Even parity, 7 data bits, 1 stop bit
Ethernet, USB, RS232, RS485, Modbus RS485
Automatic
Laurel ASCII
Data Format
Protocol
Applicable Interface Boards No parity, 8 data bits, 1 stop bit
Laurel Laurel ASCII
Ethernet, USB, RS232, RS485, RS485 Modbus