General purpose 4-port RS485 HUB with optical isolation.
| Specification | FBs-CM5H |
| Function | General purpose 1 to 3 RS485 HUB |
| Indicators | Each port has its own independent TX, RX LED indicator |
| External power | 24VDC, -15%/+20% |
| Wiring mechanism | 7.62mm fixed terminal block |