MX809 查看數據表（PDF） - MX-COM Inc

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MX809

1200bps MSK Modem

MX-COM Inc  

MSK Modem

8

C-BUS allocations for the MX809 are shown in Table 5 and Table 6.

MX809

Command Assignment

General Reset

Write to Control Register

Read Status Register

Read RX Data Buffer

Write to TX Data Buffer

Write to SYNC Program

Address/Command

Binary

Command Data

HEX

MSB LSB

01

00000001

Control Register bits set to logic “0”

48

01001000

+ 1 byte instruction to Control Register

49

01001001

+ 1 byte reply from Status Register

4A

01001010

+ 1 byte of data from RX Data Buffer

4B

01001011

+ 1 byte of data to TX Data Buffer

4C

01001100

+ 2 bytes of SYNC Word to SYNC

Program Register

Table 6: Modem No. 2 C-BUS Address/Commands – (Address Select input at a logic “1”)

5.2 Address Select

This input allows 2 MSK Modems on the same BUS, using the correct addressing.

When operating in a system using 2 MSK Modems, one MSK Modem is designated No. 1 and requires its

Address Select input to be held at a logic “0”. The second Modem (No. 2) requires its Address select input to

be held at logic “1”.

All C-BUS transactions with Modem 1 will use Address/Command allocations 40H to 44H (Table 5) and

transactions with Modem 2 will use 48H to 4CH (Table 6).

For explanation purposes, further descriptions of MX809 MSK Modem internal register functions will deal

primarily with MSK Modem No. 1 (Address Select at logic “0”).

1998 MX-COM, Inc.

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

Doc. # 20480036.004

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

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