SI3015-FS Silicon Laboratories Inc, SI3015-FS Datasheet - Page 32

• Manufacturer Part Number: SI3015-FS
• Description: SI2400 ISOMODEM LINE-SIDE
• Manufacturer: Silicon Laboratories Inc

Specifications of SI3015-FS

• Data Format: V.90
• Interface: Serial
• Voltage - Supply: 3.3 V ~ 5 V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Baud Rates: -

Si2400
The economy of the # commands is clearly evident from
this example. One caveat when using the # commands
is that the ASCII equivalents of the response can be
displayed as special or graphic characters when using a
terminal emulator program such as HyperTerminal.
However, in an embedded system, it is easy to send
non-ASCII characters.
m# Command Monitor S-Register
This command is similar to the r# command but is
repeated at the DTE rate until a new byte is transmitted
to the modem. The modem will echo the register
contents to the display as the ASCII equivalent of the
hexadecimal value of the contents. This command
executes immediately and does not require a carriage
return. Modem result codes must be disabled by setting
S14[7] (MRCD) = 1b when using this command to
ensure that the host does not confuse a result code with
data.
q# Command Read S-Register with 0x5500 Offset
This command is the same as the r# command except
that the response from the Si2400 is formatted as the
hexadecimal value 0x55aa where aa is the hexadecimal
value of the S-register contents. From a terminal, the #
following q is the ASCII equivalent of the hexadecimal
address of the S-register. This command executes
immediately and does not require a carriage return. The
0x5500 offset in the value of the register contents
prevents confusion between data and result codes and
permits the result codes to remain enabled.
Z
The “Z” command causes a software reset to occur in
the device whereby the registers will return to their
default power up value with the exception of E0, E2,
E4–E7, F8, and F9. These registers are not reset, so
the Si2400 will maintain its current DTE settings, GPIO
definitions, tone detect and transmit settings, and
overload and billing tone detection status. The hardware
reset pin, RESET (Si2400, pin 8), is used to reset the
Si2400 to factory default settings. If other commands
follow on the same line, another AT is needed after the
“Z” (e.g., ATZATS07=06<CR>).
32
ATS34=58S34
Terminal
ATw4Xr4
?<CR>
Entry
Software Reset (upper-case Z)
3D 35 38 53 33
41 54 77 34 58
41 54 53 33 34
Modem (hex)
34 3F 0D
Sent to
72 34
Response
35 38
(hex)
58
Display
58
X
Rev. 1.1
z
The Si2400 enters a low-power mode wherein the DSP
and microcontroller are powered down. The serial
interface also stops functioning. In this mode, only the
line-side chip (Si3015) and the ISOcap communication
link function. An incoming ring signal or line transient
causes the Si2400 to power up and echo an “R”.
Without a ring signal, the host must perform a hardware
reset (Si2400, pin 8) to power up the Si2400. Return
from wake-on-ring can also be set to trigger the ALERT
pin by setting S62[4] (WOR) = 1b.
Alarm Industry AT Commands
The Si2400 supports a complete set of commands
necessary for making connections in security industry
systems. The Si2400 is configurable in three modes for
these applications. The first mode, DTMF send and
receive, is selected with the “!1” command. The second
mode uses FSK transmit with a tone acknowledgement
and is selected with “!2”. Finally, “!7” is selected for the
tone-on/tone-off mode.
The following are a few general comments about the
use of “!” commands. Specific details for each command
is given below. The first instance of the “!” must be on
the same line as the ATDT or ATDP command. DRT
must be set to data mode (SE4[5:4] (DRT) = 0b) before
attempting to send tones after a “!” command. The three
data-mode escape sequences (“+++”, “escape” pin and
“ninth-bit”) only function in “!2” mode. However, using
the “+++” or “ninth-bit” is not recommended because
characters could be sent to and misinterpreted by the
remote modem. Only the “escape pin” (Si2400, pin 14)
is recommended for use in the “!2” mode. The “!1” and
“!7” modes have special escape provisions described in
their respective sections below. The AT commands for
Alarm Industry applications are described in Table 19.
In the Si2400 Rev G, executing the !3 to !6 commands
causes the Si2400 to overwrite the S36 and S38
registers prior to entering the !7 protocol states.
Effectively, the !3 to !6 protocols treat the !7 protocol as
a procedure call, using the S36 and S38 registers for
parameter passing. When the !7 protocol is entered
through the !3 to !6 entry points, the interface (e.g.,
result codes) is designed to be identical to the Si2400
Rev C !3 to !6 implementation. As such, many
applications using !3 to !6 will not need to be rewritten.
There is one deviation between the Si2400 Rev C and
Rev G, and this is related to the re definition of the S38
register. Si2400 Rev C applications writing the S38
register (Interround Time) prior to executing !3 to !6
protocols will notice that Si2400 Rev G effectively
ignores the host application's intention to modify the
interround time. For these cases, the host will need to
Wakeup on Ring (lower-case z)