10/2003
Functional Description
Operating Instructions SRIF 2002
Page 17 of 33
3.3 Serial
parameterization
For the use of the SRIF 2002 radio link module in the MPS, hand-held terminal,
and MDA devices of the ECOS range, the channel number is set via the serial
interface.
The serial programming is carried out via the additional asynchronous serial
interface (UART protocol: 4800 baud; 8N1) and offers the following options for
setting or polling the SRIF 2002:
•
Version and setting inquiry
•
Channel setting
•
Overwriting the baud rate setting
•
Connecting and disconnecting the RSSI extension
The meaning of the settings is explained in the following.
The transmission of the data via the serial interface is carried out in the form of a
string consisting of 4 characters. The first three characters encode the command
(numeric characters only), the fourth character is always “#”. If a valid command
has been detected, the SRIF 2002 responses - unless it is a version inquiry - with
the string sent via the RxD line (pin 4). The response is also carried out with the
UART protocol 4800 baud, 8N1.
Note
Communication via the additional asynchronous serial interface is only possible if
the parallel interface is disconnected or the word “0” is set at the parallel interface
(all switches open).
With the “serial parameterization”, the SRIF 2002 starts in the stand-by mode after
a power-on and waits for a serial channel setting. The SRIF 2002 only changes into
the receive mode after a successful parameterization.
Channel setting
The SRIF 2002 operates with a frequency pattern of 1,173.23 kHz. For optimum
use of the released ISM band (5.725 up to 5.875 GHz), the frequency of
5,726.0866 MHz was set for channel 1.
Example:
Setting for channel 04 (hex); corresponds to a frequency of
5,729.6063 MHz: 035#
for the frequency table, see Chapter 7 Appendix, page 31).
Summary of Contents for ECOS SRIF 2002
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