User's Manual

Chapter Four Configuration
Man_905UD_2.1.doc Page 29
Bits/sec xxx Bits/sec xxx
1200 0 57600 6
2400 1 115200 7
4800 2
9600 3
19200 4
38400 5
Radio data rate (S5) ATS5 = xxx Default = 1
To select or change the radio data rate, enter the following VALUE code. The radio data rate
should be the same at each 905U-D module in the same system. The default value is 4800
bits/sec.
Bits/sec xxx Bits/sec xxx
19200 3 115200 1
57600 2
System address, high byte (S6) ATS6 = xxx
where xxx is the Decimal value of the first byte of the system address.
The system address comprises two bytes. Note that the high byte cannot be more
than 127.
System address, low byte (S7) ATS7 = xxx
where xxx is the Decimal value of the second byte of the system address.
Unit address (S8) ATS8 = xxx
where xxx is the decimal value of the unit address.
Note that xxx cannot be 0 (zero) or more than 127.
In controlled mode, each module is configured with a unit address between 1 and 127 -
there can only be 127 modules in the one system. In transparent mode, modules are not
configured with a unit address (the value of S8 is ignored), and there is no limit to the number
of modules in a system (except for the capacity of the radio channel).
Character Type (S9) ATS9 = x Default = 4
The Character Type parameter configures the character format, the flow control on the serial
port, and the use of DTR low power mode. The character format is the data bits, start bits,
and parity configuration. The serial port flow control may be configured for to enable or
disable RTS/CTS control. In all RS-485 applications and some RS-232 applications,
RTS/CTS control must be disabled. DTR low power mode is explained in sections 3.1 and
4.3.5 of this manual - it is only used in modes 6 or 7 with an autodial address.
The character type in the 905U-D will change as soon as the ATS9 entry is made. The
character type on the configuration terminal should change at the same time such that the
905U-D understands any subsequent commands.