User's Manual

455U-D Radio Modem Module User Manual
Page 36 © Jan 2008
repeater addresses, select the destination module (use the unit address) in the left-hand box.
Do not select these boxes. When you click OK, the remote port address is automatically
entered into the RS485 path box.
You can use the wildcard address 0 if you wish to broadcast messages to all remote units.
You can have up to six repeater addresses. If you are using repeaters, then the left-hand box
is the first repeater address (the repeater nearest to the transmitting modem), followed by the
second repeater etc. If there is only one repeater, then the repeater address is entered into the
left-hand box, and the destination address in the second box. If two repeaters, then the two
repeaters are entered into the two left-hand boxes (with the first repeater in the most left-hand
box), and the destination address in the third box … and so on.
For example, if you want to set up a link to remote unit 12 via units 31, 32, 33 (in this order)
then you would select:
If you want to use repeaters in broadcast transmissions, refer to the section on Broadcast
Repeaters.
If configuring with AT commands:
• the destination address for the RS485 port is in auto dial location 3 (AT&Z3).
3.5.2 RS-232 Port
The RS232 port can be configured for “auto connect” or “single connect”.
Auto connect means that the 455U-D will start up online. This will be indicated by the LINK
LED going green.
Single connect means that the unit will start up in command mode, and will not go online
until it receives the correct AT command.
In Unacknowledged mode, the normal setting is auto connect. If single connect is selected,
then the destination address is normally controlled by the host device using AT commands.
Note that the auto connect or single connect setting has no effect on the RS485 port
- it is always auto connect.
You can enter the destination address for the RS232 port in the same way as described above
for the RS485 port.