TERMBOX‑1222 has two 12 V signal line protectors that can be used with RS‑485, RS-232C, LON, and leased-line modems. The signal ground and chassis ground are isolated from each other by a 53 V gas‑filled surge arrester.
The signal grounds are connected to common ground using a gas discharge tube.
- 1
- AC power connections
- 2
- AC power overvoltage protector
- 3
- Mounting screws
- 4
- Signal line connections/protectors