Manual

Publication 1746-UM004B-EN-P - December 2005

Programming Overview 4-15

Figure 4.3 Data Flow Between the SLC Processor and Port PRT2 of the Module

In addition, the commands in the following table provide status of and

control over the data transfer between the SLC processor and port

PRT2 of the module.

CALL 118 Allows unsolicited writes from a remote SLC or PLC node.

CALL 122 Reads a PLC data file and transfers it to the SLC I/O or M files.

CALL 123 Transfers data from the SLC I/O or M files to a remote PLC.

Command Purpose

SLC Processor

CALL 123

CALL 23

CALL 22

CALL 122

CALL 118

PRINT#

INPUT#

INPL#

INPS#

GET#

PRT2 OUTPUT QUEUE

PRT2 INPUT QUEUE

256 bytes

Port PRT2

1746-BAS or 1746-BAS-T Module

Command Purpose

MODE Sets the port parameters of PRT1, PRT2, and DH485.

CALL 16 Enables interrupt capability when a DF1 packet is received.

CALL 17 Disables the DF1 packet interrupt capability.

CALL 30 Sets the port parameters for PRT2.

CALL 31 Displays the current PRT2 port configuration on the program port terminal

screen.

CALL 35 Retrieves the current character in the 256 character input buffer of port PRT2.

CALL 36 Retrieves the number of characters in the input or output buffer of port PRT2.

CALL 37 Clears the peripheral port input and/or output buffers.

CALL 97 Enables the DTR signal for port PRT2.

CALL 98 Disables the DTR signal for port PRT2.

CALL 108 Enables DF1 driver communications. You must use this CALL in conjunction

with CALLs 16, 17, 118, 122, and 123.

CALL 110 Prints the complete output buffer with addresses, front pointer, and number of

characters in the buffer to the console device.

CALL 111 Prints the complete input buffer with addresses, front pointer, and number of

characters in the buffer to the console device.

CALL 113 Disables DF1 driver communications.