Chapter 5 Control Of Eh-Sio; Eh-Sio Control Command (Trns 9); Function Of Command - Hitachi EH-150 Series Applications Manual

Chapter 5
EH-SIO works based on the instructions from CPU module. The instruction of CPU module is made by user
program.
This chapter explains the command which controls EH-SIO, the register which display the status of EH-SIO, the
register which controls EH-SIO.
5.1

EH-SIO Control command (TRNS 9)

5.1.1

Function of command

Control of EH-SIO is executed by transmission command "TRNS 9".
TRNS 9 is the command to send / receive the data between CPU module and EH-SIO. This data includes
commands which controls EH-SIO, and a command. EH-SIO analyzes the command sent from CPU module, and
executes operation according to the command.
5 fundamental functions of TRNS 9 command are shown below.
(1) Setting of EH-SIO
If TRNS 9 command (initial-setting command) is executed, the communication mode of EH-SIO will be set up.
EHV-CPU
(2) Data receiving from EH-SIO
If TRNS 9 command (Receive command) is executed, the data stored in the receiving buffer of EH-SIO is read to
the receiving data area of CPU module.
EHV-CPU
Control of EH-SIO
EH-CPU
TRNS 9
Initial setting command
Parameter of
communication mode
Figure.5.1 Operation of TRNS 9 (Initial setting)
EH-CPU
TRNS 9
Receiving command
Data
Figure 5.2 Operation of TRNS 9 (Receiving command)
EH-SIO
Communication mode
setting
EH-SIO
EH-SIO
Receiving buffer
5 - 1
Data