Note 1: The exact meaning of the Signal Quality Measure <SQM> shall be
manufacturer defined. The lowest quality reported by SQM shall be defined as
value: 00. The highest quality reported by SQM shall be defined as value: 31.
Cellular AT Command Extensions In Support Of Voice Services Table
These commands allow the data terminal to be used as an automatic dialer for
voice calls. The format of these commands is shown in the following table:
Command
Description
+CHV<value>
†
Hang Up Voice
0: Hang up voice call
1-255: Reserved
+CDV<dial string>
†
Dial Command For Voice Calls
The format of <dial string> is identical to that for the
ATD command. This command does not cause the MT2
to change to the online state.
13.0 Layer 1 (Hardware) Communications
This section covers the basic Layer 1 protocols for hardware integration of the modem
with your DTE. Depicted below are the pinouts of the data communications ports of these
two modems.
13.1 RS-232 Serial Port Integration Parameters
You can use the guide below to design serial cables to integrate the
CDM819i and CDM820i into your systems.
Standard RS-232 DB-9 Pinout:
Pin
Name Direction
Description
---------------------------------------------------------
1
CD
«—
Carrier Detect
2
RX
«—
Receive Data
3
TX
—»
Transmit Data
4
DTR —»
Data Terminal Ready
5
GND
System Ground
6
DSR «—
Data Set Ready
7
RTS —»
Request to Send
8
CTS «—
Clear to Send
9
RI
«—
Ring Indicator
Note: Direction is DTE relative DCE.
Below you will find pinouts of the RS-232 DB-9 Male and Female connectors:
