DM300004-1 Microchip Technology, DM300004-1 Datasheet - Page 85

• Manufacturer Part Number: DM300004-1
• Description: BOARD DEMO DSPICDEM.NET 1
• Manufacturer: Microchip Technology
• Series: dsPIC™r
• Type: Microcontrollerr

Specifications of DM300004-1

• Contents: *
• Mcu Supported Families: DsPIC30F
• Supported Devices: DsPIC30F6014
• For Use With: PIC30F5013
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: FCC/JATE PSTN, Ethernet NIC
• Lead Free Status / RoHS Status: na, Lead free / RoHS Compliant
• Other names: DM300004-1R; DM300004-1R

6.8
 2004 Microchip Technology Inc.
TROUBLESHOOTING THE CONNECTION
TABLE 6-2:
The dsPIC30F Soft Modem has undergone multiple levels of testing, ranging from
extensive bench testing using standard, off-the-shelf reference modems to full ITU-T
compliance testing. The reference modems used in the testing are listed in Table 6-3.
Reference modems are not all equal in terms of data pump (DP) modulations they
support as power-on default. For example, the US Robotics External 56K modem,
model 5686E, supports V.21 and V.23, but only if it is enabled via suitable AT
commands. Attempts to connect with V.21 and V.23 will fail until these DP modulations
have been enabled.
Also the US Robotics External 56K modem, model 5686E, does not support V.32 9600
bps (NTCM). The modem will disconnect after the rate exchange sequence during the
V.32 hand shake, since this is an invalid speed setting in V.32 mode. It connects at
9600 bps (TCM) in V.32bis mode.
This troubleshooting section does not address every specification or operational
feature of the reference modems. It is intended to be a starting point should you
experience some basic connection issues.
S0
S1
S6
S7
S91
+++
ATSn=x
ATSn?
Command
AT COMMAND SET FOR dsPIC30F SOFT MODEM (CONTINUED)
V.22bis Soft Modem Demonstration
S-Registers
These registers are used set some of the simple modem configurations.
Command writes the value ‘x’ to the specified S-register (n).
Command displays the value of S-register (n)
Ring to Auto-answer On
Sets the number of rings required before the modem answers.
Auto answer ring count.
Default Value: S0 = 1
Ring Counter
Counts and stores the number of rings from an incoming call.
Wait Before Dialing
Sets the number of seconds the modem waits for dial tone before dialing.
Default Value S6 = 1
Wait for Carrier After Dial/Answer
Sets the number of seconds the modem waits for a carrier or answers
before returning on-hook and sending a NO CARRIER result code.
Default Value S7 = 60
Transmit Signal Level
This register is used to specify the transmit signal level in –dBm value.
Default Value S91 = 12 (-12 dBm)
Escape Sequence
This is a three character escape code used to enter into the command
mode from the data mode.
Description
DS51471A-page 81