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B&B Electronics RS-485 manual Set Power-up States Command, Set Turn-around Delay Command

Models: RS-485

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Set Power-up States Command

The Set Power-up States command is used to set the states of the digital outputs at power-up. This command requires a data byte. The data byte is used to specify the power-up output states. Bits 0-2 correspond to the power-up states of digital outputs 0-2. If a bit is a 0 then the output will be set LOW at power-up. If a bit is a 1 then the output will be set HIGH at power-up. Refer to Table 3.6. NOTE: This command ignores bits 3-7 of the data byte.

Command Syntax

!{addr}SS{states} Response Syntax

no response

Where {states} is a byte in which Bits 0-2 correspond to the power-up states of Digital Outputs 0-2

Set Turn-around Delay Command

The Set Turn-around Delay command sets the amount of time the 485SDA10 waits to respond after executing a command. This delay is necessary when two RS-485 transmitters are sharing a pair of wires to ensure that two transmitters are not enabled at the same time. Refer to B&B Electronics’ free RS-422/RS-485 Application Note for more information on RS-422/485. The turn-around delay is stored in non-volatile memory. This command requires a data byte. The data byte is used to specify the turn-around delay. One unit of turn-around delay is equal to the transmission time of one character. The transmission time can be computed as follows:

time = (1 / baud rate) * 10

Command Syntax

!{addr}SC{delay} Response Syntax

no response

Where {delay} is a byte used to specify the turn-around delay.

Read Module Configuration Command

The Read Module Configuration command reads the 485SDA10’s address, power-up states, and turn-around delay (in that order).

Command Syntax

!{addr}RC

Response Syntax

485SDA103798 Manual

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B&B Electronics RS-485 manual Set Power-up States Command, Set Turn-around Delay Command, Read Module Configuration Command
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RS-485 specifications

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