Apc Backups Be350C,be500C,es 550 Pinout Diagram @ Pinoutguide – Usb To Rj45 Wiring Diagram Apc The diagram to get USB cable can help if there’s an problem with it. Knowledge on recommending parts of USB is going to aid consumer in finding out that part that needs to be adjusted. UPS Communications Cable Smart Signalling 6'/2m - DB9 to RJ45. UPS Cables that provide dedicated connections between APC UPSs and desktops, workstations, and servers.
| Pin | Signal | Description |
| 1 | Shut Down (dumb mode) / RS-232 RX In (smart mode) | Set high for 1-5 sec to activate shutdown. |
| 2 | Line Fail (dumb mode) / RS-232 TX Out (smart mode) | On-battery power (normally low but goes high when the UPS switches to batteries) |
| 3 | Line Fail signal | Mains down (normally low but goes high when line fail) |
| 4,9 | GND | Ground, chassis |
| 5 | Low battery signal | (normally low but goes high when low battery) |
| 6 | Line fail signal | Inverse of pin 2 Line Fail signal |
| 7 | UPS Turn-on/off signal | (on advanced UPSes only) |
| 8 | Unregulated +24 Vdc Out ?? |
connector or cable wiring original 940-0128A and analogue of the940-0128A
9 pin D-SUB female connectorto the computer
10 pin RJ50(10P10C) male connector to the UPS
If you have a BackUPS CS, you are probably either using it withthe USB cable that is supplied or with the 940-0128A supplied byAPC, which permits running the UPS in dumb mode. By building yourown cable, you can now run the BackUPS CS models (and perhaps alsothe ES models) using smart signalling and have all the sameinformation that is available as running it in USB mode.The jack inthe UPS may be easily use a 8 pin RJ45 connector. It is easy toconstruct the cable by cutting off one end of a standard RJ45-8ethernet cable and wiring the other end (three wires) into astandard DB9F female serial port connector.
| PC Signal | PC pin | UPS Pin | UPS signal |
|---|---|---|---|
| RxD | 2 | 2 | TxD |
| TxD | 3 | 8 | RxD |
| GND | 5 | 7 | Ground |
| FG | Shield | 4 | Frame Ground |
Cached
Though these UPSes are USB UPSes, APC supplies a serial cable(typically with a green DB9 F connector) that has 940-0128A stampedinto one side of the plastic serial port connector.Here issuggested scheme of original 940-0128A cable