User's Manual

Spread Spectrum Wireless Data Transceiver User Manual
LUM0002AF Rev D Version 6.3 22
1. Assert DTR line on transceiver’s data port.
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 transceiver is
established over the RF channel or the protocol reports a timeout.
4. Repeat from Step 1, if needed.
A
SSERT AND DE-ASSERT DEFINITIONS
Assert and de-assert voltage levels depend on the data port interface type.
For transceivers with a TTL interface:
Assert line means to provide logic low TTL level (0 VDC) at the input of the transceiver.
De-assert line means to provide logic high TTL level (+5 VDC) at the input of the transceiver.
For transceivers with an RS232 interface:
Assert line means to provide positive voltage at the input of RS232 transceiver (+3…+12 VDC).
De-assert 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 follow the path defined in the Call Book
and 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 ‘000-0000’ is 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