User's Manual Part 2

4.6: Master/Slave Handling Chapter 4: Configuration and Operation

join the wireless multidrop network. If configured as a client you must tell the Se-

rial Port Adapter which devices to connect to.

Exactly how to configure for Wireless Multidrop™ see Connection Establishment –

Server and Connection Establishment – Client.

Connection Establishment – Server

In AT mode, use the “Write_Default_Server_Profile” command to select what pro-

file to use when acting as a server.

If you want to use the Wireless Multidrop™ feature and allow several devices to

simultaneously connect to your device you must enable Wireless Multidrop™ using

the “Write_Wireless_Multidrop_Configuration” command. In addition, the Serial

Port Adapter must be configured to perform a master/slave switch every time a de-

vice connects to it. This is done using the “Write_MasterSlaveRole_Policy” com-

mand.

After configuring the Serial Port Adapter for server operation, move to data mode.

Connection Establishment – Client

For clients there are two methods that can be used to create connections to a re-

mote device:

1. Establish the connection in AT mode using the “Con-

nect_To_Serial_Service_Data_Mode” command. Then move to data mode and

utilize the connection as a transparent data mode connection. It is possible to

utilize the Wireless Multidrop™ feature and connect to several devices. Note

that Wireless Multidrop™ must be enabled to be able to connect to more than

one device.

2. Configure the Serial Port Adapter in AT mode then move to data mode.

a. Select the number of devices to connect to using the

“Write_No_Of_Remote_Peers” command. Select 1 for point-to-point

operation and more than 1 for Wireless Multidrop™ operation. Note

that Wireless Multidrop™ must be enabled to be able to use a value

higher than 1. The maximum number of remote peers can be deter-

mined by calling the “Read_Max_No_Of_Remote_Peers” command.

b. Select what device(s) to communicate with using the

“Write_Default_Remote_Peer” command.

c. Then use the “Write_Default_Client_Profile” command to select what

profile to use when connecting to the selected default remote peer.

d. Finally move to data mode and send data. The Serial Port Adapter will

connect to the selected remote peer(s) using the selected profile ac-

cording to the connect scheme setting (connect on data, always con-

nected or connect on external signal).

Specify zero number of remote peers using the “Write_No_Of_Remote_Peers”

command if you do not want to act as a client.

4.6 Master/Slave Handling

When a device communicates with several other devices it is called the master. The

other devices are called slaves.