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MX805AP

Sub-Audio Signaling Processor

MX-COM Inc  

Sub-Audio Signaling Processor

11

MX805A

5.2 Address/Commands

The first byte of a loaded data sequence is always recognized by the C-BUS as an Address/Command (A/C)

byte. Instruction and data transactions to and from this device consist of an Address/Command byte followed

by either:

(i) further instructions or data

(ii) a Status or data Reply

Instructions and data are loaded and transferred, via C-BUS, in accordance with the timing information in

Figure 9 and Figure 11.

Placing the Address Select input at a logic “0” will address MX805A #1, a logic “1” will address MX805A #2.

Table 4 and Table 5 show the list of A/C bytes relevant to the MX805A

Command Assignment

General Reset

Write to Control Register

Read Status Register

Read CTCSS Rx Freq. Reg.

Write to CTCSS Tx Freq./NRZ

Baud Rate Reg.

Read NRZ Rx Data Reg.

Write to NRZ Tx Data Reg.

Write to Gain Set Reg.

Address/Command (A/C) byte

Hex

Binary

MSB

LSB

01

00000001

70

01110000

71

01110001

72

01110010

73

01110011

74

01110100

75

01110101

76

01110110

Data Bytes

+1 byte instruction to Control

Register

+1 byte reply from Status Register

+2 byte reply of CTCSS Rx Data

+2 byte instruction for Tx Frequency

and NRZ Tx/Rx baud rates

+1 byte binary data Reply

+1 byte binary data Command

+1 byte instruction for Tx Output

Table 4: MX805A #1 C-BUS Address/Commands – (Address Select input at a logic “0”)

Command Assignment

General Reset

Write to Control Register

Read Status Register

Read CTCSS Rx Freq. Reg.

Write to CTCSS Tx Freq./NRZ

Baud Rate Reg.

Read NRZ Rx Data Reg.

Write to NRZ Tx Data Reg.

Write to Gain Set Reg.

Address/Command (A/C) byte

Hex

Binary

MSB

LSB

01

00000001

78

01111000

79

01111001

7A

01111010

7B

01111011

7C

01111100

7D

01111101

7E

01111110

Data Bytes

+1 byte instruction to Control

Register

+1 byte reply from Status Register

+2 byte reply of CTCSS Rx Data

+2 byte instruction for Tx Frequency

and NRZ Tx/Rx baud rates

+1 byte binary data Reply

+1 byte binary data Command

+1 byte instruction for Tx Output

Table 5: MX805A #2 C-BUS Address/Commands – (Address Select input at a logic “1”)

1998 MX-COM, Inc.

www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480116.004

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

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