Block

Mask

Description

Synchronous Serial Interface (SSI) is a widely used serial interface standard for industrial applications especially, rotary encoders. It is a point-to-point connection from a master (e.g. PLC, microcontroller or other control systems) to a slave (e.g. the rotary encoder). In this type of interface, the position data is continually updated by the sensor and made available to the output register.

The SSICommBlockSlave emulates the encoders.

Parameters

Provide Number of Bit Resolution	Specify the number of bits resolution. Option As Block Input: Add a new port to the block. User can set the number of bits through this port. Option As Block Parameter: Add a new field in the GUI. User can specify the number of bits in this field.
Provide Bit Shift Pattern	Specify the shift patterm (MSB first or LSB first) Option As Block Input: Add a new port to the block. User can set the shift pattern through this port. Option As Block Parameter: Add a new field in the GUI. User can specify the shift pattern in this field.
Provide Gray Encoded Info	Specify if the data is gray encoded or not Option As Block Input: Add a new port to the block. User can set the info through this port. Option As Block Parameter: Add a new field in the GUI. User can specify the info in this field.
Provide TM Time	Specify transfer timeout (monoflop time). It is the minimum time required by the slave to realize that the data transmission is complete. After tm, the data line goes to idle and the slave starts updating its data in the shift register Option As Block Input: Add a new port to the block. User can set the time throught this port. Option As Block Parameter: Add a new field in the GUI. User can specify the time in this field.

Inputs

TM_Time	This port is used to specify the transfer timeout. This port is available only when option As Block Input is chosen in the GUI.
BitRes	This port is used to specify the number of bit resolution. This port is available only when option As Block Input is chosen in the GUI.
MSBFirst	This port is used to specify the bit shift pattern. This port is available only when option As Block Input is chosen in the GUI.
GrayEncoded	This port is used to specify if the data is gray encoded or not. This port is available only when option As Block Input is chosen in the GUI.
SSIClkIn	SSI clock input.

Outputs

SSIDataOut	SSI serial data.

Characteristics and Limitations

This Block has no specific characteristics or limitations

Direct Feedthrough	N/A
Discrete sample time	N/A
XHP support	N/A
Work offline	YES

RT-XSG Documentation

SSI Communication Slave Interface