User guide

S-Register Definitions
270 Chapter 3 Modem Emulation Commands
S14 General Options Status. Indicates the status of
command options.
• Default: 138 (8Ah) (10001010b)
• Bit 0: Ignored.
• Bit 1: Command echo (En):
0 = Disabled (E0).
1 = Enabled (E1). (Default.)
• Bits 2 and 4: Quiet mode (Qn):
0 = Display result codes (Q0). (Default.)
1 = Do not display result codes (Q1).
2 = Disables “CONNECT” result codes (Q2).
3 = Disables “CONNECT” result codes on incoming
connections (Q3).
• Bit 3: Result codes (Vn):
0 = Display numeric result codes (V0).
1 = Display verbose result codes (V1). (Default.)
• Bits 5-7: Ignored.
138 (8Ah)
S21 General Options Status. Indicates the status of
command options.
• Default: 52 (34h) (00110100b)
• Bits 0 - 2: Ignored.
• Bits 3-4: DTE’s DTR behavior (&Dn):
0 = DTR drop is ignored (&D0).
1 = DTR drop causes a transition from data to
command mode without hanging up an existing
connection (&D1).
2 = DTR drop hangs up the existing connection
(&D2) (Default.)
3 = DTR drop causes the modem to do a soft reset if
the ATZ command was executed (&D3).
• Bit 5: Modem’s DTR behavior:
0 = The modem’s DTR remains on at all times
(&C0).
1 = The modem’s DTR follows the state of the TCP
connection (&C1). (Default.)
• Bits 6-7: Ignored.
- - 52 (34h)
S25 Delay to DTR Off. The amount of time that the modem
will delay before taking the action specified by the
AT&Dn command.
0-255 s or 0.01 s 5
Register Function Range Units Default