When using an Active Cable SI_SCOPE defaults to sending your keystrokes to both devices on the communication line you are monitoring. At times you may want only one device to receive any keyboard activity. To direct keyboard activity to only one device open the functions menu and choose the "Keyboard Settings" option. A small sub menu will appear with four options. Simply choose the setting you want or press escape to exit.
Note that SI_SCOPE will not send any keystrokes that it recognizes as a command to the communications line. No keystrokes pressed while the ALT key is down will be sent to the line. To send ASCII control codes use the following key sequences:
| CODE NAME | HEX VALUE | KEYSTROKE |
| NULL | 00 | CTRL_@ |
| SOH | 01 | CTRL_A |
| STX | 02 | CTRL_B |
| ETX | 03 | CTRL_C |
| EOT | 04 | CTRL_D |
| ENQ | 05 | CTRL_E |
| ACK | 06 | CTRL_F |
| BEL | 07 | CTRL_G |
| BS | 08 | CTRL_H |
| HT | 09 | CTRL_I |
| LF | 0A | CTRL_J |
| VT | 0B | CTRL_K |
| FF | 0C | CTRL_L |
| CR | 0D | CTRL_M |
| SO | 0E | CTRL_N |
| SI | 0F | CTRL_O |
| DLE | 10 | CTRL_P |
| DC1 | 11 | CTRL_Q |
| DC2 | 12 | CTRL_R |
| DC3 | 13 | CTRL_S |
| DC4 | 14 | CTRL_T |
| NAK | 15 | CTRL_U |
| SYN | 16 | CTRL_V |
| ETB | 17 | CTRL_W |
| CAN | 18 | CTRL_X |
| EM | 19 | CTRL_Y |
| SUB | 1A | CTRL_Z |
| ESC | 1B | CTRL_[ |
| FS | 1C | CTRL_\ |
| GS | 1D | CTRL_] |
| RS | 1E | CTRL_^ |
| US | 1F | CTRL__ |