B&B Electronics RS-485 manual Set Module Address, Command$ = !0SO + CHR$states, Addr =

b)Set Appropriate Outputs LOW states = states AND (NOT(mask))

By “ANDing” the current states with the complement of the appropriate mask of a digital output (given in Table 5.1), the output’s data bit will be set to a “0” (which will be set LOW).

c)Construct the string

Command$ = “!0SO” + CHR$(states)

2)Transmitting the command string:

Print #1, Command$;

Example 5.3 - Set Digital Output #0 HIGH and Digital Output #2 LOW of the module with and address of 5.

addr = 5

‘Set bit 0 of states to make Digital Output #0 HIGH states = states OR 1

‘Clear bit 2 of states to make Digital Output #2 LOW states = states AND (NOT(4))

Command$ = “!” + CHR$(addr) + “SO” + CHR$(states)

Print #1, Command$;

Digital Output #0 will be set HIGH. Digital Output #2 will be set LOW. Digital Output #1 will not change. Note that the variable states is assumed to be value from Example 5.2.

Set Module Address

The Set Module Address command is used to change the address of a 485SDA10. This command requires a data byte. The data byte is used to specify the new address of the unit. The address of a module is stored in non-volatile memory.

The steps to setting a module address are given below:

1)Constructing the command string:

Command$ = “!” + CHR$(addr) + “SO” + CHR$(newaddr)

Where {addr} is the current address of the module and {new address} is a byte representing the new address.

2)Transmitting the command string:

Print #1, Command$

485SDA103798 Manual 25

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