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I NTEGRATED C IRCUITS D IVISION
AT Command Set
CPC2400E
Command
H Hook
Function and Description
H0 Hang up the telephone line.
H1 Go off hook without answering a telephone call. This may be disabled in countries prohibiting its use.
&HT
I
PTT Test
Command
Identi?cation
The &HT command causes the modem to transmit tones for PTT testing. The test tone is generated until a character
is typed on the modem’s terminal. The country con?guration may disable this command. The modem returns an
ERROR result if this command is issued.
&HT0-9 EMMF tone for digit n where the command was &HTn.
&HT10 EMMF tone”*”
&HT11 EMMF tone “#”
&HT12 EMMF tone “A”
&HT13 EMMF tone “B”
&HT14 EMMF tone “C”
&HT15 EMMF tone “D”
&HT16 V.21 channel 1 mark
&HT17 V.21 channel 2 marks
&HT18 V.23 1200bps marks
&HT19 V.23 75bps marks
&HT20 V.21 channel 1 spaces
&HT21 V.21 channel 2 spaces
&HT22 V.23 1200bps spaces
&HT23 V.23 75bps spaces
&HT24 V.22 originate mode
&HT25 V.22 answer mode
&HT26 V.22bis originate mode
&HT27 V.22bis answer mode
&HT28 V.25 calling tone
&HT29 550Hz guard tone
&HT30 1800Hz guard tone
&HT31 Silence
The I command asks the modem for information that can be used to determine the modem’s compatibility with other
software and to ensure the modem is operating properly.
I0 Display product code. The modem reports its product code to the terminal. The modem produces
information text dependent upon its features and capabilities.
I1 Display ROM checksum. The modem reports the value of its ROM checksum. The decimal number
displayed is the eight bit sum (from 0 to 255) of all the bytes in ROM.
I2 Test the ROM checksum. The modem checks its ROM to ensure it is correct. The modem reports a
result code indicating whether the ROM is OK or in ERROR.
I3 Display Software Versions. The modem reports the modem controller and data pump software
versions, and the modem controller software release date, to the terminal.
I4 Display Modem Identi?cation. The modem reports a con?gurable identi?cation message to the
terminal.
10
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