Belkin PP4.0 Universal KVMs feature an RS232 port on the Console section that allows connecting to serial control devices to remotely control channel switching on the KVM. A USB to RJ11 cable is needed to connect your KVM to your external control devices and custom commands used.
Applicable to:
- All Belkin 2nd Gen Universal Secure KVM models
USB to RJ11 Serial Cable Pinout
For convenience, Belkin manufactures an RJ11 to USB-A cable, F1DN-RC-USB-CBL, for use with the KVM. Custom cables can be made using the pin-out chart below.
RJ11 To USB Pinout
| RJ11 Connector | USB Connector | Functionality Comment |
| PIN 1 | PIN 1 | +5V Power |
| PIN 2 | Not Applicable | TTL From Remote to SKVM |
| PIN 3 | Not Applicable | TTL From SKVM to Remote |
| PIN 4 | PIN 6 | Ground / Power Drain (Shield) |
| PIN 5 | PIN 4 | RS232 From SKVM to Remote |
| PIN 6 | PIN 5 | RS232 From Remote to SKVM |
RJ11 To DB9 Pinout
| RJ11 Connector | DB9 Connector | Functionality Comment |
| PIN 1 | Not Applicable | +5V Power |
| PIN 2 | Not Applicable | TTL From Remote to SKVM |
| PIN 3 | Not Applicable | TTL From SKVM to Remote |
| PIN 4 | PIN 5 | Ground / Power Drain (Shield) |
| PIN 5 | PIN 3 | RS232 From SKVM to Remote |
| PIN 6 | PIN 2 | RS232 From Remote to SKVM |
RS232 Serial Commands
Switching channels utilizes the command #AFP_ALIVE (COMMAND), replacing (COMMAND) with the channel you would like to switch to.
Example:
To switch to channel 5, you would send #AFP_ALIVE EF.
Channel Switching Command Table
| Switch To | Command |
| Channel 1 | FE |
| Channel 2 | FD |
| Channel 3 | FB |
| Channel 4 | F7 |
| Channel 5 | EF |
| Channel 6 | DF |
| Channel 7 | BF |
| Channel 8 | 7F |
RS232 Serial Baud Rate
Baud: 115200
