| Command | What's it Do? | What it Means? |
| %C0 | Data compression disable | Compression selection |
| %C1 | MNP5 enable | |
| &C0 | DCD Always On | Data Carrier Detect |
| &C1 | Modem Controls DCD | |
| &D0 | Ignore DTR |
Select modem reaction to DTR. Works with &Q command |
| &D1 | On-Line Command Mode | |
| &D2 | DTE Controls DTR | |
| &D3 | Reset modem | |
| &F | Load Factory Defaults |
Load Factory Default |
| &F0 | Load Factory 0, no FC | |
| &F1 | Load Factory 1, HW FC | |
| &F2 | Load Factory 2, SW FC | |
| &Q1 | Synch mode 1 |
Rockwell asynch/synch mode |
| &Q2 | Synch mode 2, dial stored number when DTR makes transition | |
| &Q3 | Synch mode 3, manual dialing | |
| &Q4 | Reserved | |
| &Q5 | Reliable Asynch mode | |
| &Q6 | Normal Asynch mode | |
| &S0 | DSR Always On | USR |
| &S1 | Modem Controls DSR | |
| X1 | Dial straight through without waiting for dial tone. | |
| X2 | Wait for tone before dialing | |
| X3 | Ignore dial tone | |
| X4 | Wait for tone, detect dialtone and report busy |