Extended AT commandsCommand Function&C_ &C0 Force Carrier Detect Signal High (ON)&C1 Turn on CD when remote carrier is present&D_ &D0 Modem ignores the DTR signal&D1 Modem returns to Command Mode after DTRtoggle&D2 Modem hangs up, returns to the CommandMode after DTR toggle&D3 Resets modem after DTR toggle&F_ &F Recall factory default configuration&G_ &G0 Guard tone disabled&G1 Guard tone disabled&G2 1800 Hz guard tone&K_ &K0 Disable flow control&K3 Enable RTS/CTS hardware flow control&K4 Enable XON/XOFF software flow control&K5 Enable transparent XON/XOFF flow control&K6 Enable both RTS/CTS and XON/XOFF flowcontrol&M_ &M0 Asynchronous operation&P_ &P0 US setting for off-hook-to-on-hook ratio&P1 UK and Hong Kong off-hook-to-on-hook ratio&P2 Same as &P0 setting but at 20 pulses perminute&P3 Same as &P1 setting but at 20 pulses perminute&R_ &R0 Reserved&R1 CTS operates per flow control requirements&S_ &S0 Force DSR Signal High (ON)&S1 DSR off in command mode, on in on-linemode&T_ &T0 Ends test in progress&T1 Perform Local Analog Loopback Test&T3 Perform Local Digital Loopback Test&T4 Grant Remote Digital Loopback Test requestby remote modem&T5 Deny Remote Digital Loopback Test request&T6 Perform a Remote Digital Loopback Test&T7 Perform a Remote Digital Loopback Test andSelf-Test&T8 Perform Local Analog Loopback Test andSelf-Test&V &V0 Displays Active and Stored ProfilesAppendix D. Manual modem commands 51
