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WJ-8718-19/FE HF RECEIVER
INSTALLATION AND OPERATION
2.4.8.2.2
Data Format:
Tier 1
Full Status parameter data of a standard WJ-8718 HF Receiver equipped
with the WJ-8718/232 Option is 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 2.4.8.2.6.
Tier 1 is
structured as follows:
1.
Byte 1:
Receiver Address Byte.
2.
Byte 2:
Data Information Definition Byte (DID).
s.
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.
2.4.8.2.3
Receiver Address Byte
The data bits in the first byte (controller to receiver) determine which
receiver is to be referenced. Up to 15 receivers can be controlled and monitored by
one controller (such as the WJ-9644A Asynchronous Controller) via the WJ-8718/232
Option.
As shown in Table 2-10 five bits of the receiver address byte allow for 15
unique binary-coded addresses from 0 through 15. The three most significant bits of
the address are a binary code (110) that uniquely identifies the function (receiver
address) of the byte.
In the monitor mode, the receiver address byte is returned to the controller
by the receiver prior to the transmission of data (receiver to controller).
Table 2-10.
Receiver Address Byte
27
26
25
24
23
22
21
2°
1
1
0
Address
Receiver Address:
Byte Code
Range 00000-11111
2-45
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