4
10. DC power input port
11. Mat
12. Installation aligning plug
IT-SDS-304-T-4D -4DI
（
RS-485
）：
Back view
1. Power indicator
2. Running statues indicator
3. Network connection/statues indicator
4. Factory default button (DEF)
5. COM1~COM4 receive data statues indicator
6. COM1~COM4 transmit data statues indicator
7. Company name, products series
8. Ethernet RJ45 port
9. Serial port: COM1~COM4
10. DC power input port
11. Mat
12. Installation aligning plug
