AT Commands Reference Manual - wireless netcontrol GmbH

Chapter 3: AT Commands Reference
The modem is able to support GSM full rate speech version 1, GSM full rate speech version 2
(EFR), GSM half rate speech version 3 (AMR Half Rate) only:
• GSM full rate speech version 1 is the first priority
• GSM full rate speech version 2 (EFR) is the second priority
• GSM half rate speech version 3 (AMR Half Rate) is the third priority
The GSM half rate speech version 1 and GSM full rate speech version 3 (AMR Full Rate) will not
be supported by the modem.
+MTTY, Motorola TTY Configuration
This AT command selects the TTY (Tele Typewriter) mode. This command only selects the TTY
mode. Activation of TTY is done by AT+MAMOD=6 (See +MAMOD for activation or
deactivation of TTY).
Note: Tele-typewriter or Teletype, a typewriter with an electronic communication. TTY is an
electronic device for text communication via a telephone line, used when one or more of
the parties have hearing or speech difficulties.
Command
Type Syntax Response/Action Remarks
Set AT+MTTY= OK
or:
+CME ERROR:
Read AT+MTTY? + MTTY :
OK
or:
+CME ERROR:
Test AT+MTTY=? +MTTY : (1-3)
OK
or:
+CME ERROR:
The SET command is used for setting
the current TTY mode.
The READ command returns the
current TTY mode .
The Test command returns the possible
value’s range.
The following table shows the +MTTY parameters.
Table 3-21: +MTTY Parameters
Description
1 Full TTY mode (both uplink and downlink support TTY data; used when both
side parties are deaf).
2 VCO mode (Voice Carry Over- uplink is voice active downlink is TTY).
3 HCO mode (Hearing Carry Over-downlink is voice active uplink is TTY).
Value is saved in NVM.
Notes:
VCO: Voice Carry Over is intended for people who cannot hear but are able to speak
clearly. During a VCO relay call, the Deaf or Hard-of-Hearing caller speaks directly to
the person they are conversing with. When that person responds, a Communication
April 15, 2010 H24 - AT Commands Reference Manual 3-43