ModbusTCP ⇔ ModbusRTU/ASCII
(LAN ⇔ RS-422/485)
Interface Converter


●Connects 10Base-T/100Base-TX by auto-detection.
●Supports Modbus TCP master mode and Modbus TCP slave mode
●When master mode, you can register up to 8 IP addresses of Modbus TCP slave for the range of Modbus ID with which it connects.
●When slave mode, it connects up to 10 Modebus TCP master devices simultaneously to share the control of the access.
●Automatic register-scanning function of the slave mode makes the response for request by the master more quick.
●Can be used in the temperature between -25 and 75 degree Celsius.
●Low power consumption. It supports DC5 to 30V wide input.
●Supports installation by the wall bracket, the magnet, and installation to 35mm DIN rail.

Specifications (Interface Converter SI-485MB)
Conversion Modbus TCP <-> Modbus RTU/ASCII 
Serial Interface RS-422/485
6 pole terminal block (Press-to-screw pitch type), Fitness wire AWG24-14/2.5mm2
Termination resistor can be set.
Synchronous Method Asynchronous
Baud Rate (bps) 300/600/1200/2400/4800/9600/19200/38400/57600/115200
Data Frame Structure Data(7 or 8) + Parity(Even, Odd or None) + Stop(1 or 2)
Protocol Modbus RTU, Modbus ASCII
Surge protection 15KV ESD
LAN Interface Ethernet IEEE802.3, RJ-45 connector, 10BASE-T/100BASE-TX
Protocol Modbus TCP
LED display 10BASE-T, 100BASE-TX, Activity, Link, Full/Half duplex
Transformer insulation 1500V
Configuration By Web Manager or by Telnet
Power Supply AC adapter or
Terminal block: DC5 to 30V from 6th pin
Consumption 1.5W
Temperature*1 Operating: -25 to 75 degree Celsius
Storage: -25 to 85 degree Celsius
Humidity 5 to 95% RH (no condensation)
Size 65 x 90 x 24 mm (W x D x H), About 200g
Accessories AC adapter*2, Utility CD-ROM, Instruction manual*3, Warranty
*1: Temperature specification of the AC adapter (GF12-US0618) is 0 to 40 degree Celsius and AC adapter (VFN650B) is -10 to 50 degree Celsius.
*2: VFN-650B is attached froom August 2023. (Changed from GF12-US0618)
*3: Only in Japanese