STEPPII-55/56-LT H
ARDWARE
DESCRIPTION
V
ERSION
1.01
7
MIC N2
I(-)
8
MIC P2
I(+)
Balanced microphone input. Can be used to feed
directly an active microphone.
If not used leave it open.
R
I
≈ 50 kΩ
differential
V
Imax
= 20 mVpp
9
SPK N2 with amplifier O
10
SPK P2 with amplifier O
Analogue audio interface. Balanced audio output.
Can be used to operate directly an earpiece.
If not used leave it open.
8
Ω
/1 W
11
Boot select
I
STEPPII-55/56-LT boots in debug mode if this pin
is set to low. Connect it to GND in case of
firmware update. For normal operation leave it
open.
0 V (ground)
12
NC
-
Not connected
-
13
IGN2
I
Input 8
+10.8 ... +32 V
14
RxA RS232
O
15
TxA RS232
I
Serial interface for direct connection to the host
PC (configuration, evaluation, receiving data and
others) or to the STEPPII-55/56-LT Eval-Board.
If not used leave open.
V24,
±
12 V
Table 12:
Pins description of 15-pin AMP connector
7.4.2 Special pin description
7.4.2.1 VC 5
This output can be used to power some external functions. VC 5 has to be used as a
power supply for external user applications which require 100 mA at 5 V ± 5% VDC.
This power supply is available when the terminal is switched on. To use this pin see
chapter
7.4.2.2 Boot select
To update a new STEPPII-55/56-LT firmware, this pin should be switched to GND
(ground). Leave it open for a normal STEPPII-55/56-LT operation (tracking, call, etc.).
7.4.2.3 Serial communication signals (RxA, TxA)
The board supports a full duplex serial channel. The serial connection is at V24,
±
12 V
level. You do not need to use any level shifter. The signals on these pins are obtained
to RS232 compatible signal levels. All supported variable baud rates can be
controlled from any terminal software. You can directly communicate with a PC
serial port. It is recommended to use the STEPPII-55/56-LT Eval-Board in order to
communicate with theterminal.
RxA
This is the main receiving channel and is used to receive
software commands to the board from any terminal
software (e.g. HyperTerminal) or from user written
software.
TxA
This is the main transmitting channel and is used to output
navigation and measurement data to any terminal
software (e.g. HyperTerminal) or user written software.
This confidential document is a property of FALCOM and may not be copied or circulated without previous permission
.
Page 38