Multi-Tech Systems Modem Module MT3334SMI - Manual (Page 38)

ModemModule Developer’s Guide
MT3334SMI 38
Table 3-2. Single-Page Class 1 Transmit Example
Action by Action by
Command Respone Local Modem Remote PC
AT+FCLASS=1 OK Set Class 1
ATD<string> Dial and send CNG Answers
Look for V.21 Sends CED, V.21
Detect flags Sends HDLC flags
CONNECT Detect flags
<NSF frame> Get CSI Send CSI packet
<DLE><ETX> Send NSF packet
OK
AT+FRH=3
CONNECT Detect flags
<CSI frame data> Get CSI Send CSI packet
<DKE><ETX> Get FCS
OK Accept FCS Check FCS
AT+FRH=3
CONNECT Detect flags
<DIS> frame data Get DIS Send DIS packet
<DKE><ETX> Get CRC
OK Accept FCS Check FCS
AT+FRH=3 NO CARRIER Detect loss of carrier Drop carrier
AT+FTH=3 Send V.21 carrier Detect carrier
CONNECT Send flags Detect flags
Send TSI frame Get TSI frame
<TSI frame data> Send FCS
<DLE><ETX> CONNECT Send flags
Send DCS frame Send DCS frame
<DCS frame data> Send FCS, flags
<DLE><ETX> OK Drop carrier
AT+FTS=8; +FTM=96 Wait 80 msec
CONNECT Send V.29 carrier Detect carrier
<TCF data pattern> Send TCF data Get TCF data
<DLE><ETX> OK Drop carrier
AT+FRH=3 Detect carrier Send V.21 carrier
CONNECT Detect flags Send flags
<CFR frame data> Get CFR frame Send CFR frame
<DLE><ETX> Check FCS Send CRC
OK Accept FCS
AT+FRH=3 NO CARRIER Detect loss of carrier Drop carrier
AT+FTM=96 CONNECT Send V.29 carrier Detect carrier
<page image data> Send page data Receive page
<DLE><ETX> OK Drop carrier
AT+FTS=8; +FTH=3 Wait 80 msec
Send V.21 carrier Detects carrier
CONNECT Send flags Detects flags
<EOP frame data> Send EOP frame Receives EOP
<DLE><ETX> Send FCS
OK Drop carrier (Final frame)
AT+FRH=3 Detect carrier Send V.21 carrier
CONNECT Detect flags Send flags
<MCF frame data> Get MCF frame Send MCF frame
<DEL><ETX> Check FCS Send FCS
OK Accept FCS
AT+FRH=3 NO CARRIER Detect carrier loss Drop carrier
AT+FTH=3 Send V.21 carrier Detects carrier
CONNECT Send flags Detect flags
<DCN packet> Send DCN frame Receives DCN
<DLE><ETX> Send FCS
OK Drop carrier
ATH0 OK Hang up Hangup