DekTec DTM-3237 DVB-S2 Receiver - Manual (Page 37)

DTM-3237 – OEM DVB-S2 Receiver with DVB-ASI Output
User Manual
37
Figure 9: Read frequency reply
The reply consists of the following bytes:
 Address and I 2 C read-bit (0x60 and ‘1’)
 Category byte (0x90)
 Setting byte (0x03)
 Read byte (0x01)
 Four frequency bytes (decimal 950.000.000 or hexadecimal 38.9F.D9.80)
 Checksum (0xDC, see Table 2)
Table 2: Checksum computation
Command Reply
Address 0x60 0x60
Category 0x90 0x90
Setting 0x03 0x03
R/W 1 1
Index (byte 1) 0x00 0x00
Index (byte 2) 0x00 0x00
Data byte 3 - 0x38
Data byte 2 - 0x9F
Data byte 1 - 0xD9
Data byte 0 - 0x80
Sum: 0xF4 0x324
Checksum: 0x0C 0xDC