User manual

Chapter Four Configuration
Man_805U Rev 1.9 Page 39
AT&Z0=33,34,35,5 will store an address sequence, where 5 is the destination address and 33,
34 and 35 are repeater addresses. The first repeater will be 33.
The 805U master will attempt to connect to the destination address (slave). If the module
cannot connect, or if communications fails, the module will continually send “connect”
messages to make a connection.
Slave module AT&M2&L3&E1
The module will start up in operating mode and will automatically accept any connect
message addressed to it.
Low Power Mode
Low power mode is normally used with auto-connect controlled mode, although it can also be
used with other controlled modes. Before you configure the unit for auto-connect controlled
mode, enter
AT&D3
This allows the DTR signal on the RS232 port to control the module. When the host resets
(signal low) the DTR signal, the module will disconnect the radio link, and the module will
revert to low power mode - the module will switch off its radio receiver and microprocessor.
When the host activates the DTR signal, the module will start up and attempt to connect to its
slave address.
Controlled mode, single-connect
AT&E1 &M2&L0 (both master and slave module)
The module starts up in command mode and waits for a command from the host device. An
ATD command will initiate a connect command to another module.
HOST
805U
# 5
HOST
805U
# 8
For example, ATD8 to module #5 will initiate a connect command to be sent to module #8.
Module #5 will respond with RINGING to its host. If #8 is not already connected to another
module, it will connect (set DCD) and respond to #5. Module #8 will respond to its host with
CONNECT and will automatically go to operating mode. Module #5 will respond with
CONNECT to its host and will also automatically go to operating mode.
If #8 does not reply, #5 will make up to 5 attempts to connect, and will then respond to its
host with NO CARRIER. If #8 is already connected to another module, then it will respond to
#5 with a “busy” message and #5 will respond to its host with BUSY or NO CARRIER (this
response can be configured under “responses”).
If there are repeater modules, then the ATD command will have the form
ATDr1,r2,r3,r4,r5,d where “d” is the destination address and “r” is a repeater address. “r1” is
the repeater closest to the master unit. For example, ATD2,3,10 will try to connect to 10 via
repeaters 2 and 3. Up to 5 repeater addresses may be used. A repeater can already be
connected to another module - it can still act as a repeater for another link.
Once a connection is made (DCD set), any data sent will be acknowledged by the other
module. The connection will be broken (DCD reset) if an ACK is not received within 5
attempts to transmit a message.