Models 4351A, 4351B, 4352A, 4352B, 4353, 4354 serial port 4, RS-232/RS-485 port, DB-9 connector network port 2, 10/100BaseT Ethernet port, RJ-45 connector (models 4351A, 4351B, 4353) 2, fiber mode Ethernet port MT-RJ connector with 62.5/125 um optical cable (models 4352A, 4352B, 4354) port isolation 500 supports Jet Direct (network printing) Modbus function 01- Read coil status 06- Modify register content 02- Read input status 07- Read abnormal status 03- Read hold register 08- Loopback diagnostic test 04- Read input register 15- Force multiple coils 05- Modify coil status 16- Preset multiple register communication speed Copper Ethernet port: 10/100 Mbps (model 4353 only supports 100 Mbps) Fiber optic Ethernet port: 100 Mbps Serial port: Up to 115.2 Kbps per port Status indicators Pass, Fault, Active, Solid Link -1 per network port, TX (send) -1 per port, RX (receive) -1 per port, manufactured by TRICONEX