Spread Spectrum Wireless Data Transceiver User Manual
2. Send the AT-command(s) to the transceiver on the Data Receive Line.
3. Hold DTR line asserted until the communication link between the local and remote transceivers is
established over the RF channel or your protocol requires to timeout.
4. Repeat from Step 1, if needed.
A
SSERT AND
D
E
-
ASSERT DEFINITIONS
Assert and de-assert voltage levels depend on the data port interface type.
For transceivers with a
TTL
interface:
Assert RS232 line means to provide logic low TTL level (0 VDC) at the input of the transceiver;
De-assert RS232 line means to provide logic high TTL level ( +5 VDC) at the input of the transceiver;
For transceivers with
RS232
interface:
Assert RS232 line means to provide positive voltage at the input of RS232 transceiver (+3…+12 VDC).
De-assert RS232 line means to provide negative voltage at the input of RS232 transceiver (-3…-12
VDC).
ATDT
COMMANDS
:
ATXC_
is similar to manually changing the
Entry to Call
parameter in the transceiver’s Call Book. For
example:
•
ATXC0
will change
Entry to Call
to ‘0’ (zero).
•
ATXCA
will change
Entry to Call
to ‘All’.
If a link to a Slave needs to be made without using a Repeater, it is imperative that the ATXC# command
is issued. Otherwise, issue the command ATD####### where ####### is the serial number of the
transceiver with which a link is being made. The transceiver will link first to the Repeater(s) specified and
then to the Slave transceiver.
ATDT_
is similar to ATXC_, except after the
Entry to Call
parameter in the transceiver’s Call Book has
been changed, the transceiver will start calling this number. For example, sending
ATDT0
to a transceiver
will:
1. Change its Entry to Call to ‘0’ (zero).
2. This will cause it to start calling the transceiver with the serial number listed in the main
column of the Call Book on line ‘0’.
When this command is issued, the transceiver’s Call Book must not have any ‘000-0000’ entries in it at
any position before the number to be used per the ATDT_ command.
Issuing
ATDT0
or
ATDT1
will result in the transceiver calling the transceiver entered on Line 0 or 1,
respectively. However, issuing
ATDT3
will not work because there is ‘000-0000’ entered on Line 2 in the
Call Book.
0 900-1234
1 900-5678
2 000-0000
3 900-4321
4 000-0000
5 000-0000
6 000-0000
7 000-0000
8 000-0000
9 000-0000
LUM0002AD Version
6.1
22
