VMIVME-5565-110000 VMIVME-5565 Gas turbine card

Operator Data Entry Mode The Operator Data Entry Mode provides for un-buffered data entry through the auxiliary RS-232 port. In this mode, the DMC-21xx provides a buffer for receiving characters. This mode may only be used when executing an applications program. The Operator Data Entry Mode may be specified for Port 1. This mode is entered and exited by the CI command. NOTE: Operator Data Entry Mode cannot be used for high rate data transfer.The DMC-21xx provides a special interrupt for communication allowing the application program to be interrupted by input from the user. The interrupt is enabled using the CI command.

Using Communication Interrupt

The #COMINT label is used for the communication interrupt. For example, the DMC-21xx can be configured to interrupt on any character received on Port 1. The #COMINT subroutine is entered when a character is received and the subroutine can decode the characters. At the end of the routine the EN command is used. EN,1 will re-enable the interrupt and return to the line of the program where the interrupt was called, EN will just return to the line of the program where it was called without reenabling the interrupt. As with any automatic subroutine, a program must be running in thread 0 at all times for it to be enabled.

Inputting String Variables

 String variables with up to six characters may be input using the specifier, {Sn} where n represents the number of string characters to be input. If n is not specified, six characters will be accepted. For example, IN "Enter A,B or C", V{S} specifies a string variable to be input. The DMC-21xx, stores all variables as 6 bytes of information. When a variable is specified as a number, the value of the variable is represented as 4 bytes of integer and 2 bytes of fraction. When a variable is specified as a string, the variable can hold up to 6 characters (each ASCII character is 1 byte). When using the IN command for string input, the first input character will be placed in the top byte of the variable and the last character will be placed in the lowest significant byte of the fraction. The characters can be individually separated by using bit-wise operations, see section Bit-wise Operators.

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