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FIGURE 2-5
WJ-8718A/MFP
2.4.5.2
Control and Monitor Data Format
2.4.5.2.1
Byte Strueture
The I/O software structure of the WJ-8718A/232M Option consists of a series of
ll-bit binary coded words (if parity is used), presented in a pre-determined sequence.
Each
byte is composed of a start bit, eight data bits, a parity bit (if parity is enabled), and a stop bit.
Figure
2-5
illustrates the byte structure. Binary coded logic levels are high
(-6 V)
or low
(+6 V).
PARITY BIT
J
START BIT
0= HOLD
I =START
t
' - . . . . - ---..r----"" ,
DATA BITS
STOP BIT
o
STOP
Figure
2-5.
Byte Strueture
2.4.5.2.2
Data Format: Tier
1
Full status parameter data of a standard WJ-8718A HF Receiver equipped with the
WJ-8718A/MFP and 232M Options are contained in seven bytes.
These seven bytes, plus
address and data definition bytes and a byte for Tier 2 access, comprise Tier
1
of the I/O
software structure. Tier 2 is discussed in paragraph
2.4.5.2.6.
Tier 1 is structured as follows:
1.
Byte 1: Receiver Address Byte.
2.
Byte
2:
Data Information Definition Byte (DID).
3.
Bytes 3 through
9
(10): In monitor mode, Byte 3 is the address byte
returned from the receiver to controller and Bytes 4 through 10 are
data.
In command mode, Bytes 3 through
9
are parameter data
(controller to receiver).
4.
Byte 10 or
11:
Tier 2 Access Byte.
2-16
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