Serial Interface Configuration - Siemens M20 Terminal Technical Description

Siemens Information and Communication Products
11
12 No VOICE No Carrier
call
possible
13 No DATA No Carrier
call
possible
14
15 No FAX call No Carrier
possible
16 Distorted or no speech from
the far end during an active
call
8.3.3 SW download
No Fault Error
Message
1 No SW download after power
up
2
3
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
Version 8 dated 15.03.00
M20 active, boo- ATD<num>
ked into net (M20 ; Semicolon
idle), VOICE is last cha-
number exists racter!
M20T LED ON Otherwise
DATA call
M20 active, boo- SIM card must have activated
ked into net (M20 DATA number
idle), DATA
number exists
M20T LED ON
ATD<num>
NO Semico-
lon as last
character!
Otherwise
VOICE call
M20 active, boo- SIM card must have activated
ked into net (M20 FAX number
idle), FAX num-
ber exists M20T
LED ON
M20: microphone externally biased and not DCde-
coupled from M20
Status Check
M20T: LED on/ Bootcode enable must be high
blinking during power up
Ignition must be set high during
complete download
M20T: LED Off, PCload32.exe does no download See chapter on SW
power is on
Application notes
+CLCK: 1,4 / AT+CLCK="AO",0,"<c
Outgoing fax call ode>",7 /Unlock all
barred services, <code> availa-
ble from
Network provider
(barring services)
OK Check if <num> exists,
<num> has to
include AREA CODE
SIM card DATA number
available from Network
provider
OK SIM card must have acti-
vated DATA number
SIM card must have acti-
vated FAX number
Couple microphone li-
nes to M20 with
capacitors, Bias micro-
phone balanced to GND
SW response / Action
comment
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
Ignition must be set high
during complete down-
load
download
A
177