ES-8621 Rev.9

GR8-EM

Communication Adaptor GR8 Series

Ethernet/RS-485 Adaptor

(Modbus use)
Functions & Features
• Bidirectional protocol converter for Modbus/TCP (Ethernet) and Modbus RTU (RS-485)
• Fast response time thanks to the Cache function
• Available the type designed to connect to DL8 and R8 series modules

MODEL: GR8–EM–[1]-R

ORDERING INFORMATION

• Code number: GR8–EM-[1]-R
Specify a code from below for [1].
(e.g. GR8-EM-D-R)

[1] INSTALLATION

S: Single Use
D: Coupled with DL8
* The internal bus of DL8 is not connected although coupled with DL8.

POWER INPUT

DC Power
R: 24 V DC
(Operational voltage range 24 V ±10 %, ripple 10 %p-p max.)

GENERAL SPECIFICATIONS

Connection
•Power input: Euro type connector terminal
Applicable wire size: 0.2 - 2.5 mm²
Stripped length: 7 mm
•RS-485: Tension clamp (Front Twin connection)
Applicable wire size: 0.2 - 1.5 mm²
Stripped length: 10 mm
•Ethernet: RJ-45 connector
Housing material: Flame-resistant resin (black)
Isolation: Ethernet to RS-485 to power supply to FE1
DIP SW Setting: Selection of IP Address and Maintenance/Normal mode
Configurator (IP Address and baud rate)
Settings from Web browser (provided by user)
Compatible terminal, browser
Windows PC (Windows 7, 8.1, 10):
   Internet Explorer 11.0.47
   Firefox 62.0.3
   Chrome 69.0.3497.100
   Edge 44.17763.1.0
Smart Phone, Tablet PC (iOS 11.4.1, Android 8.0.0)
   Safari 11.4.1
   Chrome 69.0.3497.100
Status indicator LED: RUN, ERR, RD, SD, LINK, LK100
■ Modbus RTU
•Supported Commands
Read Coil Status (01)
Read Input Status (02)
Read Holding Registers (03)
Read Input Registers (04)
Force Single Coil (05)
Preset Single Register (06)
Diagnostics (08)
Fetch Comm. Event Counter (11)
Fetch Comm. Event Log (12)
Force Multiple Coils (15)
Preset Multiple Registers (16)
Report Slave ID (17)
■ Cache Commands
Following commands are valid for Cache function.
Read Coil Status (01)
Read Input Status (02)
Read Holding Registers (03)
Read Input Registers (04)
(Up to 100 queries)

Ethernet, Modbus/TCP

Standard: IEEE 802.3u
Transmission type: 10BASE-T, 100BASE-TX
Transmission speed: 10 / 100M bps
(Auto Negotiation)
Protocol: TCP/IP
Number of connections: 8
Transmission media:
10BASE-T (STP cable; Category 5)
100BASE-TX (STP cable; Category 5e)
Maximum segment length: 100 meters
Communication configuration: with Web browser
IP address: 192.168.0.1 (factory default setting)
Subnet mask
Default gateway
Port No.: 502 (factory default setting)
User name, password
Modbus exception response
Connection time out

RS-485, Modbus-RTU

Protocol: Modbus RTU
Configuration: Bus type multi-drop
Standard: Conforms to TIA/EIA-485-A
Communication: Half-duplex, asynchronous, no procedure
Transmission media: Shielded twisted-pair cable (CPEV-S 0.9 dia.)
Communication configuration: with Web browser
Baud rate: 2.4, 4.8, 9.6, 19.2, 38.4(*), 57.6, 115.2 kbps
  Parity bit: None, Odd(*), Even
  Stop bit: 1(*), 2
  Read response timeout: 1000 msec.(*), 10 - 10 000 msec.
  Write response timeout: 1000 msec.(*), 10 - 10 000 msec.
  Cache function: Enabled(*), disabled
Inter-frame interval: 10 msec.(*), 0 - 500 msec.
  (*)Factory default setting
Terminating resistor: Built-in 110 Ω (DIP Switch, default: enabled)

INSTALLATION

Power consumption
• DC: ≤ 1.5 W 24 V DC
Operating temperature: -10 to +55°C (14 to 131°F)
Operating humidity: 10 to 90 %RH (non-condensing)
Mounting: DIN rail
Weight: 120 g (0.26 lb)