Overview on ESI Commands

List of ESI Commands

There are 11 ASCII module commands which instruct the ESI module serial communications and other housekeeping utilities. These commands are sent to the ESI module by the Quantum controller. Data exchange between the ASCII device and the Quantum controller is integrated into the READ/WRITE command structure described in this section. The output data (the first 4x registers) contains the command; the first input register (3x) contains the response and also the echo of the command.

The following table is a summary of the ESI module commands:

Command	Name	Description
0	No operation	do nothing
1	READ ASCII message	start a read ASCII message
2	WRITE ASCII message	start a write ASCII message
3	GET DATA	transfer data from module to PLC
4	PUT DATA	transfer data from PLC to module
5	GET TOD	get time of day from module
6	SET TOD	set time of day in module
7	SET MEMORY REGISTERS	set registers to value
8	FLUSH BUFFER	flush serial port buffers
9	ABORT	abort ASCII message currently running
A	GET BUFFER STATUS	get port input buffer