A Gateway is a media using which a remote instrument can be communicated irrespective of the communication standard of the remote instrument. A Gateway has intelligence in it to converter the proprietary data to standard protocol format. The gateway can be used for data acquisition and control from remote location. . This can be used as slave to slave modbus communication also.
ACON AG-02 is a device, which is used as a Protocol converter between any to serial devices. (Modbus RTU to Modbus ASCII)
The model ACON E-02 is high speed RS 232 to RS 485 converter. It supports auto baud rate. It allows RS232 device to transmit data over 1.2 km distance to increase networking capability. The optical isolation protects one segment of your network from problems that arises on the other. The model ACON E-02 supports RS485- 2 /4 wires. (It requires no DIP switch setting just connect 2 wire or 4 wire, it will automatically detect configuration)
EI_EBI Interface is a device, which is used as a Protocol converter between EBI (Scada) and EI Readers. EBI communicate in PCSC protocol whereas EI readers communicate in Smax protocol. EI EBI interface receives Query from EBI in PCSC protocol on COMA port and sends respective query to EI reader connected at COMB port in Smax protocol. The response received from EI reader is send to EBI.