ABB YPN107A YT204001-DM DC input module

Binary Command Mode Some commands have an equivalent binary value for the controllers. These values are listed in the Command Reference next to the command in parentheses in hexadecimal format . Binary communication mode can be executed much faster than ASCII commands since the controller does not have to first decode the ASCII characters. Binary format can only be used when commands are sent from the PC and cannot be embedded in an application program.All binary commands have a 4 byte header followed by data fields. The 4 bytes are specified in hexadecimal format.

Controller Event Interrupts and User Interrupts 

The DMC-18x2 provides a hardware interrupt line that will, when enabled, interrupt the PC bus, which will allow the controller to notify the host application of particular events occurring on the controller. Interrupts free the host from having to poll for the occurrence of certain events such as motion complete or excess position error. The DMC-18x2 uses only one of the PC’s interrupts; however, it is possible to interrupt on multiple conditions. For this reason, the controller provides a status byte register that contains a byte designating each condition. The DMC-18x2 provides an interrupt buffer that is 16 deep. This allows for multiple interrupt conditions to be stored in sequence of occurrence without loss of data. The DMC-18x2 provides two command forms of interrupt functionality, EI and UI. Specific interrupt conditions can be enabled using the EI command, or explicit user defined interrupts can be sent using the UI command.

Enabling Event Interrupts (EI command)

 To enable certain conditions, use the command EIm,n. Where the first field “m” represents a 16-bit value of conditions described in the table below. For example, to enable interrupts on X and Y motion complete and position error, set EI515 (i.e. 515=20 +21 +29 ). Once the EI command is enabled for a specific condition, an interrupt will occur for every instance of that condition, except for the items marked with an asterisk (*), they must be re-enabled after every occurrence

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