Telit EVK2 User Guide
1vv0300704 Rev.13- 2012/06/25
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page
27 of 149
6.1.
Serial Port Setup
Communications between your application and the Telit modules are allowed connecting the
DTE to the
Asynchronous Serial Interfaces
of Base-Band Chip, ASC0 and ASC1, through
the
stacked standard RS232 communications port (double 9 way D-socket connector
at slow
data rates of
RS232 protocol)
or
a standard
USB-B Series receptacle
(
at higher data rates of
USB1.1 specification through a CMOS HUB that realizes a multiple attachment point
device
).
ATcommands/PROGRAM
LOWER
UPPER
SERVICE
CS1139B
ddb9b.skd
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
DB9
Stacked
Figure 10: Double 9 way D-Socket Connector
The selection is made short circuiting
PL302&PL303
(
RS232 mode
) or
PL302&PL301
(
USB 1.1 mode
) by 10 pieces of
2 contacts jumpers
. This solution has been implemented
because you can isolate every single line during the development.
CS
1139B
RS232
STACKED
SO301
RS232
USB
1
RS232 MODE
39
40
PL303
PL302
PL301
PL502
USB
SO501
SO101
2
1
CS
1139B
USB MODE
RS232
STACKED
SO301
RS232
USB
usb_rsb.skd
39
40
PL303
PL301
PL302
USB
SO501
PL502
Figure 11: Serial Ports selection
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