ESI Commands

Introduction

The information in this chapter describes the commands which are sent by the CPU to control the communication functions of the ESI module and the response from the ESI module containing data and status information.

What Is in This Chapter?

This chapter contains the following topics:

Overview on ESI Commands
ESI Command Word
Command Processing
Command 0 - NO OPERATION
Command 1- READ ASCII MESSAGE
Command 2 - WRITE ASCII MESSAGE
Command 3 - GET DATA (Module to Controller)
Command 4 - PUT DATA (Controller to Module)
Command 5 - GET TOD (Time of Day)
Command 6 - SET TOD (Time of Day)
Command 7 - SET MEMORY REGISTERS
Command 8 - FLUSH BUFFER
Command 9 - ABORT
Command A - GET BUFFER STATUS
Response Structure for Illegal Commands
Module Status Word (Word 11)
Reading beyond Valid Register Range