RS232 RADIO MODEM
232C-868FR1
Information concerning the version number and installation date is sent on the Serial Link;
ready to be displayed by Software like Windows HyperTerminal.
'ATR’:
'ATP’:
Hayes registers reset to default values
This command allows the user to reset ALL the stored EEPROM registers to their default
values (see registers description below).
Switch to Stand-by mode
This command allows the user to switch to Stand-by mode. The Modem is in Normal
Mode by default. The Modem switches back to Normal Mode with a character reception
from the Serial link.
2.5 Radio Test Commands
These special AT commands are integrated into the RF modem in order to make measurements during
continuous transmission, and are primarily used during radio tests (radiated power, bandwidth, etc.) to
show conformance to the ETS 300 220 standard.
It stops when any character is sent:
•
•
•
•
•
ATT0 <CR>: Transfer of a pure carrier ‘0’
ATT1 <CR>: Transfer of a pure carrier ‘1’
ATT2 <CR>: Transfer of a modulated carrier at F(maximum)
ATT3 <CR>: Transfer of a modulated carrier at F(average)
ATT4 <CR>: Transfer of a modulated carrier at F(minimum)
2.6 Registers description
The RF modem can offer several possible configurations using a set of parameters. Those parameters
are located in registers and have a default value. This value can be modified or consulted via Hayes
commands.
The parameters of the radio modem are stored in the EEPROM and can therefore be changed up to
10,000 times. The parameters are available when switching on the modem. The registers are listed
below:
Radio
Access
R/W
Register
S204
Name
Carrier
Length
Description
Indicates the radio carrier length in milliseconds, sent at the beginning
of each radio frame. Valid between 4 and 50 milliseconds.
Default value: 15ms
Serial Link
Access
Register
Name
Description
R/W
S210
Baud Rate
Indicates the serial link rate: Value Rate
'1'
'2'
'3'
'4'
'5'
'6'
-> 1200 Bits/s
-> 2400 Bits/s
-> 4800 Bits/s
-> 9600 Bits/s
-> 19200 Bits/s (Default value)
-> 38400 Bits/s
R/W
S211
Data Length
Indicates the number of data bits on the serial link:
->
->
'7'
'8'
7 data bits.
8 data bits (Default value)
DS232-4 June ’04
©2004 Reg. No. 227 4001, ENGLAND
Page 10
RFSOLUTIONS [ RFSOLUTIONS.LTD ]
