6 Configuration commands - for Falcom STEPP

STEPPCONFIG VERSION 1.8.14
The checksum consists of a “*” character followed by two hex
values.
In order to calculate the Checksum, use your own application. Below a small
source code written in Visual Basic:
{*****************************************}
Public Sub CheckSum(field As String)
If field = “” then CS = “*”
CS = 0
For i = 1 to Len(field)
CS = CS Xor Asc(Mid$(field, i, 1))
Next
CS = Hex(CS)
If Len(CS) =1 then
CS = “0” & CS
CS = “*” & CS
END SUB
{*****************************************}
Therefore, the string over which the checksum has to be calculated is:
field = PSRF,
excluding “$”character.
All fields in all proprietary NMEA messages are required, none are optional.
All NMEA messages are comma delimited “,”.
Types of NMEA messages:
NMEA
Message
type
Selectable
message
Writable
message
Executable
message
Syntax Function
$PSRF103,,00,, 01
$PSRF108,
=
$PSRF109, ,,
,,
6.1.2.1 NMEA messages improved structure
This NMEA message select the
supported messages which can be
polled once, or setup for periodically.
This NMEA message sets user-
definable parameter values.
This NMEA message sets userdefinable
parameter values to
download the stored history data.
All NMEA messages have to be sent in uppercase (capital letter) otherwise the
configuration could not be accepted. If a send message (via SMS, data
connection or locally) is incorrectly typed by the user (based on the structure in
table below), the device ignores (refuses) that command and no configuration
is performed. Due to the incorrectly typed of NMEA message you may carry
the STEPP device into the instability conditions.
If more than one parameter (combining message on the same writable message
line) has to be sent within a command (NMEA message), they should be
separated by colons “:” (indicated as [:]). The square brackets have to be
omitted when you input that command.
If a parameter of NMEA message is sent without value to
the device then this parameter is deactivated by setting a undefined value.
This confidential document is the property of FALCOM GmbH and may not be copied or circulated without permission.
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