B&B Electronics 232OPSDA Reading Digital I/O Command, Set Digital Output Command, 0RD, States

Table 3.3 - Read A/D Response

# of Channels Specified			Response
			Channels Returned	Bytes
decimal	Hex	ASCII	(order of response)	Returned
0	0	NUL	Channel 0	2
1	1	SOH	Channels 1,0	4
2	2	STX	Channels 2,1,0	6
3	3	ETX	Channels 3,2,..,0	8
4	4	EOT	Channels 4,3,..,0	10
5	5	ENQ	Channels 5,4,..,0	12

NOTE: There are three test channels that can be read: Ref+, Ref-, and Ref+/2. Specify 13 (0Dh) to read Ref+, 12 (0Ch) to read Ref-, and 11 (0Bh) to read Ref+/2.

Reading Digital I/O Command

The Read Digital I/O command returns a byte which represents the state of the digital input and digital output. Bit 0 corresponds to the state of the digital output, and bit 3 corresponds to the state of the digital input. If a bit is a 0 then the digital state of that digital I/O is LOW. If a bit is a 1 then the digital state of the I/O is HIGH. NOTE: Bits 1-2 and 4-7 of the data byte are ignored.

Command Syntax

!0RD

Unit Response

{states}

Where {states} is a byte in which bits 0 corresponds to the current state of the digital output and bit 3 corresponds to the current state of the digital input.

Set Digital Output Command

The Set Digital Output command is used to set the state of the digital output line. This command requires a data byte. The data byte is used to specify the output state. Bits 0 corresponds to the state of the digital output. If bit 0 is a 0 then the output will be set LOW. If bit 0 is a 1 then the output will be set HIGH. NOTE: This command ignores bits 1-7 of the data byte.

Command Syntax

!0SO{states}

Where {states} is a byte in which bit 0 corresponds to the output state of the digital outputs.

Unit Response no response

14Documentation Number 232OPSDA1397 Manual

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