Hitachi NJI-350B User Manual

Page 167

Chapter 5 Instruction specifications

5-117

Received data is defined by either of following 4 ways depending on setting in [7] s+A to [9] s+C.

(a) Start code and data size

s+A : Data length (Byte)
s+B : H80 (=Start code)
s+C : H0000

(b) Start and end code

s+A : H0000
s+B : H80 (=Start code)
s+C : H80 (=End code)

s+A : H0000
s+B : H0000
s+C : H80 (=End code)

(d) Data length

s+A : Data length (Byte)
s+B：H0000
s+C：H0000

In case of start code used, CPU can fail to receive due to buffer size full if data with wrong start code is sent.

(6) "t" parameter

: Set by user

[0]

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[A]

[B]

t+B

[0] Execution bit:

Set "1" by user program to send data. This bit is reset after communication completed.

[1] Communication completed :

This bit is set "1" when communication completed without error, and reset at communication starting.

[2] Communication failed :

This bit is set "1" when communication fails, and reset at communication starting.

[3] Initialize :

Set "1" by user program to initialize TRNS 0 command. If this bit is on while communication, the communication
is forced to be stopped.

[4] Initialize completed :

This bit is set "1" when initializing completed without error. Initialize bit [3] is reset at this timing.

[5] Receive enabled :

Set "1" by user program if CPU needs to receive data after data sending. This bit is reset after communication
completed.

[6] Parity error flag :

This bit is set "1" when parity error detected.

[7] Framing error :

This bit is set "1" when framing error detected.

[8] Overrun error :

This bit is set "1" when overrun error detected.

(

d, s, t)

Start code

End code

Data length