Watkins-Johnson Company WJ-8718-19/FE Instruction Manual page 72

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INblALLATION AND OPERATION
2.4.8.2.6 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 2-13. The 3 most significant bits of the byte
are the DID code (111), the 2q and 26 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 point in time the
four most significant bits of the 000 register byte on page 1 are the only bits of'Tier
2 with an assigned function. These four bits contain the 100 digit (in BCD form) of
tuned frequency if the WJ-8718 HF Receiver is equipped with both the WJ-8718/232
and the WJ-8718/1 Hz Options. The remaining bytes in Tier 2 are available for future
expansion. Table 2-14 is the data format for Byte 1 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. See paragraph 2.4.8.2.9 for an example of data
format requiring access to Tier 2.
2.4.8.2.7 Monitor Format Example
Table 2-16 contains examples of data format for full status monitor
operations of a WJ-8718A HF Receiver, equipped with the WJ-8718A/232M and MFP
Options. Table 2-17 contains examples of data format for partial status monitor
operations. Operating parameters of the receiver to be monitored (at address 15) are
given in Table 2-18.
2.4.8.2.8 Command Format Example
In the example in Table 2-19 the receiver at address 4 is commanded to
establish the listed parametersn Table 2-20 lists the data format for full status
command and Table 2-21 is the data for commanding only the BFO frequency.
2.4.8.2.9 Access Tier Format
In this example, shown in Table 2-22, it is assumed that the receiver is
equipped with 1 Hz tuning and the controller desires to monitor the status of the 1
Hz digit of tuned frequency. The receiver is at address 20 and the 1 Hz digit is 6.
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