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INSTALLATION AND OPERATION
WJ-8718A/MFP
The remaining three bits of the DID byte contain a binary-coded register address.
All receiver parameters are stored in seven 8-bit registers, addressed in binary code from
°
through 6.
If
all parameter data are to be transmitted, the logic levels of the three register
address bits are irrelevant.
However, if one word of receiver parameter data is to be
transmitted, the 3-bit binary code for the desired register must be established in the 20, 2 1 , and
22 bits 9f the DID byte.
2.4.5.2.5
Data Bytes
If all receiver parameters are to be controlled, the bytes following the DID Byte
will contain data transmitted from receiver to controller or from controller to receiver, as
listed in Table 2-8. If all receiver parameters are to be monitored, Byte 3 will be the address
return byte followed by data, Bytes
4
through 10.
Transmission of less than complete
parameter data requires that the register associated with a particular byte of data be ad-
dressed in the DID byte.
The selected data will then be transmitted as Byte 3 or 4.
Paragraphs 2.4.5.2.7 to 2.4.5.2.9 contain examples of data formats for full and partial status
transmissions, in monitor and command modes.
2.4.5.2.6
Tier 2 Access Byte
A second tier containing four pages of eight bytes each is available and is accessed
by the byte shown in Table 2-9. The three most significant bits of the byte are the DID code
(llI), the 2 4 and 2 3 bits are a page code, and the remaining three bits are the address code for
the second tier.
Tier 2 contains four pages of eight bytes each. At this time only 2 bytes of tier 2
information have been assigned.
The first contains the 100 digit (in BCD form) of tuned
frequency if the WJ-8718A HF Receiver is equipped with the WJ-8718A/232M, WJ-8718A/MFP,
and WJ-8718A/1 Hz Options. The second contains the COR Threshold and the COR Flag if the
receiver is equipped with the WJ-87I8A/CORM option.
The remaining bytes in Tier 2 are
available for future expansion. Tables 2-10a and 2-10b are
the data format for Byte 1 and
Byte
2
on Page 1 of Tier
2.
This byte must be preceded by a receiver address byte, a Tier 2
access byte, and a DID byte containing the register address 000 or 001. See paragraph 2.4.5.2.9
for an example of data format requiring access to Tier 2.
2-18
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