Hitachi EH-150 Series - Page 32

Chapter 5 Control of EH-SIO
5 - 2
(3) Data sending from EH-SIO (Send only)
If TRNS 9 command (Send command + Send data) is executed, data will be sent from EH-SIO.
Figure 5.3 Operation of TRNS 9 (Send command)
(4) Data sending and receiving
If TRNS 9 command (Receives after sending command + send data) is executed, data will be sent from EH-SIO.
Then the receiving data is stored in CPU module. (In this case, data sending and receiving are operated by one
command.)
Figure 5.4 TRNS 9 Operation of TRNS 9 (Receive after sent command)
(5) Data receiving and sending
If TRNS 9 command (Send after receiving command + send data) is executed, EH-SIO waits to receive data from
external device. After receiving, EH-SIO will send data. The received data is stored in CPU module. In this case,
data receiving and sending are operated by one command.)
Figure 5.5 TRNS 9 Operation of TRNS 9 (Send after received command)
EH-SIO
TRNS 9
Send command
Data
EH-SIO analyzes a command
and transmits data.
Data
EH-CPU
EHV-CPU
EH-CPU
EHV-CPU
EH-SIO analyzes a command
and send data.
TRNS 9
Receive after sent
command
Data A
Data A
Data B
Data B
EH-SIO
EH-CPU
EHV-CPU
TRNS 9
Send after received
command
Data A
Data A
Data B
Data B
EH-SIO will send the data putted from CPU
module, if data is received.
EH-SIO