APC 6000 사용자 설명서

6739389EN/FB

- Page 9

Functions

Function 1 and 2: read N bits

◗

function 1: read output or internal

bits;

◗

function 4: read input bits.

The number of bits must be less
than or equal to the bit field size
(see memory board).

response

request

0404

66 FE

example

404

40B

request:

response:

last bit transmitted

first bit transmitted

1 byte

✷

bytes

2 bytes

1 byte

2 bytes

byte detail:

slave address

1 or 2

CRC 16

slave address

1 or 2

CRC 16

Unused bits are set to zero

address of
first bit
MSB LSB

number of bits
to read

number of
bytes
read

first
byte
read

last
byte
read

00101110

10101001

(binary values)

FB B7

40C

411

Reading bits at location 404 to 411 of slave at address 20H (charger signals)

JBUS protocol

(continued)