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Section 5
31
Model 9002
Remote Control Operation
5.4.5 - Code $0D - Send Back Channel Definition
This is a one-byte instruction which sets the system up to send back filter type data in the related channel. The
Model 9002 must be set up as a talker by the remote controller to send back the data. The data consists of four
bytes which represent the filters of Channel 1 and 2.
• Byte 1 # of codes being sent back
• Byte 2 Identification of special code sent = $0D
• Byte 3 Coded filter type in Channel 1
• Byte 4 Coded filter type in Channel 2
There are three types of channel filter cards to be encoded for return transmission: Lowpass, Highpass and Special.
The hex codes for the available low- and highpass filters are given in Table 5.11.
Table 5.11 Hex Codes of Filters
Bytes 3 and 4 will be sent back with the filter type data for Channels 1 and 2, respectively. The structure of bytes 3
and 4 is given below.
D7 D6 D5 D4 D3 D2 D1 D0
00xx x xx x
D7 and D6 will always be zero for this command codes.
If D5 = 1, the channel is a special filer (FL). D4-D0 are decoded into number between 0 and 31. Refer to the Product
Data Sheet (Appendix A) for the code definitions.
Filter Code Characteristic
Lowpass
$00 8-pole Butterworth
$01 8-pole 6 zero elliptic
$02 8-pole Bessel
$03 8-pole 6-zero constant delay
$05 8-pole, 6-zero, elliptic (200kHz)
$06 4-pole Bessel
$07 4-pole, Butterworth
$08 8-pole, Bessel (200kHz)
$09 8-pole, Butterworth (200kHz)
$0A 8-pole, 6-zero constant delay (200 kHz)
Highpass
$10 8-pole Butterworth
$11 8-pole 6 zero elliptic
$15 8-pole, 6-zero elliptic (200kHz)
$17 4-pole, Butterworth
$19 8-pole, Butterworth (200kHz)
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