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WJ-8718A/MFP
TABLE 2-'6
TABLE 2-7
2.4.5.2.3
Receiver Address Byte
The data bits in the first byte (controller to receiver) determine which receiver is
to be referenced. Up to 32 receivers can be controlled and monitored by one controller (such as
the WJ-9644A Asynchronous Controller) via the WJ-8718A/232M remote interface. As shown
in Table 2-6, five bits of the receiver address byte allow for 32 unique binary-coded addresses
from 0 through 31 (Table
2-3).
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
2-6.
Receiver Address Byte
2
7
2
6
2
5
2 4
2
3
2
2
2
1
2 0
1
1
0
Address
Receiver Address:
Byte Code
Range 0
0
0 0 0 - 1 1 1 1 1
2.4.5.2.4
Data Information Definition (DID) Byte
Byte 2 is the Data Information Definition (DID) Byte, as shown in Table 2-7. The
three most significant bits of the DID byte are a binary code (111) which uniquely defines
Byte 2 as a DID byte. The 2 4 bit of the DID byte is the .command/monitor bit, which defines
the function of the data bytes to follow Byte 2. If the 2 4 bit is logic 1, the controller desires to
command the receiver and will transmit receiver parameter data in the byte(s) following
Byte 2.
If the 2 4 bit is logic 0, the controller desires to monitor the receiver, which will
transmit the address byte (paragraph
2.4.5.2.3),
and the byte(s) following, which contain the
current status of the addressed receiver.
Table 2-7. DID Byte
2 7
2 6
2 5
2
4
2 3
2
2
2
1
2
0
1
1
1
DID
e/M
S/A
Register:
Byte Code
000-110
C/M
=
Command (1) or Monitor
{D)
S/A
=
Single (1) or All (0) Bytes
The 2 3 bit of the DID byte defines the number of data bytes to succe.ed Byte 2: a
logic 1 indicates a single byte, and a logic 0 indicates all bytes.
2-17
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