Setup

Initialization

The table describes the two initialization phases for the I/O Smart Link device:

Phase	Description
1	I/O Smart Link must be connected to a Modbus client. When the 24 Vdc power supply is activated, the Modbus communication for the I/O Smart Link device is initialized and addressing is taken into account.
2	After receiving a maximum of 25 frames from the client, I/O Smart Link automatically adapts its communication parameters to those of the client (speed, parity and number of stop bits).

NOTE: The Modbus network communication speed is the same for all serial connections for the Modbus devices used. It is imposed by the lowest communication speed of a server device.

NOTE: Automatic adaptation to the communication parameters only occurs on powering up the I/O Smart Link.

Setting the Modbus Address Parameters

The I/O Smart Link device addressing is performed using two coding switches:

The left-hand coding switch sets the tens.
The right-hand coding switch sets the units.

NOTE:

The I/O Smart Link address must be between 01 and 99.
A standard Modbus network consists of up to 31 servers.
In run mode, the user can change the Modbus server address without having to de-energize the I/O Smart Link.

To reset the I/O Smart Link to factory settings by using the coding switches, proceed as follows:

De-energize Smart Link Modbus.
Set the Modbus address to value 00.
Re-energize the I/O Smart Link.
Set the selected address.

For more information, see Resetting to Factory Parameters.

Communication Parameters

The communication parameter values are as follows:

Settings	Authorized values	Default value
Data rate (in Baud)	4 800 9 600 19 200 38 400 57 600 115 200	19 200
Parity	Even and one stop bit Odd and one stop bit No parity (parity bit eliminated), two stop bits are needed.	Even (with one stop bit)

Settings

Authorized values

Default value

Data rate (in Baud)

4 800

9 600

19 200

38 400

57 600

115 200

19 200

Parity

Even and one stop bit
Odd and one stop bit
No parity (parity bit eliminated), two stop bits are needed.

Even (with one stop bit)

NOTE: The Modbus network communication speed is the same for all serial connections for the Modbus devices used. It is imposed by the lowest communication speed of a server device.

NOTE: User is not required to configure the communication parameters to I/O Smart Link device. The I/O Smart Link device is capable to perform Auto Baud rate. See Auto Baud Rate for more information.

Auto Baud Rate

The I/O Smart Link supports auto baud rate feature after performing Level 1 reset. This implies that the I/O Smart Link device will automatically adjust its current communication settings (such as baud rate, parity, etc.) to align the new communication settings (baud rate, parity, etc.) of the client device. To perform this operation, device will listen to client requests (<50 modbus frames) before updating to new settings. See Reset Button for more information.

NOTE: During this update process the communication might encounter frequent failure.