CHAPTER 13 RS-485 COMMUNICATIONS

13.2.3 Transmission Protocol

13

Transmission format

Order

(1)

(2)

(3)

(4)

(5)

Description

(Hexadecimal value)

Start code

Count of No. of pieces of data

Fixed value used by system

Process status

Connection method

(6) Amplifier station No.

(7)

Fixed value used by

system

(8) CMND

(9) MODE

(10) End data

(11) Sequence No.

(12) Data section count

(13) Fixed value used by system

(14) Data section

(15) BCC

Transmission command

(From host to amplifier)

5A

No. of pieces of data

00

FF

7A

00: Fixed

Reception command

(From amplifier to host)

5A

No. of pieces of data

00

00

7A

00: Fixed

Station number of target

amplifier

Amplifier station No.

11

11

00

00

FF

FF

FF

FF

FF

FF

FF

FF

As per command As per command

00

00

00

00

01

01

No. of pieces of data of No. of pieces of data of

data section

data section

00

00

Memory type

Address (L)

Memory type

Address (L)

Address (M)

Address (M)

Address (H)

Address (H)

No. of loaded or written

bytes

No. of loaded or written

bytes

00

00

STR1

As per command

STR2

As per command

Calculated BCC

Calculated BCC

*1: The range of calculation of the BCC is from (2) to (14).

*2: The range of counting of the number of data pieces is from (4) to (15).

13-40 PC Loader Communications