Application notes
Version 8 dated 15.03.00 177
Siemens Information and Communication Products
A
8.3.3 SW download
8.4 Serial interface configuration
The serial interface to the M20/M20 Terminal has to be initialized as follows:
19200,8,N,1 (baud rate 19200, data bits: 8, parity: no, stop bit: 1)
A serial interface configuration file for a Windows 95/98/NT Hyperterminal program (file: m20.ht) can be found on the
11 +CLCK: 1,4 /
Outgoing fax call
barred
AT+CLCK="AO",0,"<c
ode>",7 /Unlock all
services, <code> availa-
ble from
Network provider
(barring services)
12 No VOICE
call
possible
No Carrier M20 active, boo-
ked into net (M20
idle), VOICE
number exists
M20T LED ON
ATD<num>
; Semicolon
is last cha-
racter!
Otherwise
DATA call
OK Check if <num> exists,
<num> has to
include AREA CODE
13 No DATA
call
possible
No Carrier M20 active, boo-
ked into net (M20
idle), DATA
number exists
M20T LED ON
SIM card must have activated
DATA number
SIM card DATA number
available from Network
provider
14 ATD<num>
NO Semico-
lon as last
character!
Otherwise
VOICE call
OK SIM card must have acti-
vated DATA number
15 No FAX call
possible
No Carrier M20 active, boo-
ked into net (M20
idle), FAX num-
ber exists M20T
LED ON
SIM card must have activated
FAX number
SIM card must have acti-
vated FAX number
16 Distorted or no speech from
the far end during an active
call
M20: microphone externally biased and not DCde-
coupled from M20
Couple microphone li-
nes to M20 with
capacitors, Bias micro-
phone balanced to GND
No Fault Error
Message
Status Check SW response /
comment
Action
1 No SW download after power
up
M20T: LED on/
blinking
Bootcode enable must be high
during power up
Bootcode enable must
be high together with po-
wer on and needs to
remain high for at least 1
second. If initialisation
correct; M20T LED
stays dark after power on
2 Ignition must be set high during
complete download
Ignition must be set high
during complete down-
load
3 M20T: LED Off,
power is on
PCload32.exe does no download See chapter on SW
download
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