5.2.23 - 1-Wire [U6 Datasheet]

This function performs 1-Wire communication.

Firmware 1.17 or higher is required to use this function.

For additional information on how to use this function, please see the 1-Wire App Note

Table 5.2.23-1. 1-Wire Command Response

Command:
Byte
0	Csum8
1	0xF8
2	0x1D
3	0x3C
4	Csum16 L
5	Csum16 H
6	Options
		Bit 0: DPU Control Enable
		Bit 1: DPU Polarity
		Bit 2: DPU Idle
7	Reserved
8	Sense Pin
9	DPU Pin
10	Reserved
11	ROM Function
12	ROM0 (LSB)
13	ROM1
14	ROM2
15	ROM3
16	ROM4
17	ROM5
18	ROM6
19	ROM7 (MSB)
20	Reserved
21	Num TX
22	Reserved
23	Num RX
24	TX Byte 0
…	...
63	TX Byte 39

Response:
Byte
0	Csum8
1	0xF8
2	0x1D
3	0x3C
4	Csum16 L
5	Csum16 H
6	Error Code
7	Reserved
8	Reserved
9	Warnings
		Bit 0: No Devices Detected
		Bit 1: Type 1 interrupt (Not Tested)
		Bit 2: Type 2 interrupt (Not Supported)
10	Reserved
11	Reserved
16	Data 0
…	…
63	Data 47

Options: This byte provides control of the dynamic pull-up.
Bit 0: enables control of the DPU line.
Bit 1: sets the polarity of the switch. 1 = high on the specified DIO turns the switch on.
Bit 2: sets the idle state. 1 = DPU on while IDLE.
Sense Pin: This is the DIO on the LabJack that is connected to the data line of the 1-wire bus.
DPU Pin: This is the DIO line that will control the dynamic pull-up if enabled in the options byte.
ROM Function: This byte specifies the function to be performed on the 1-wire bus.
ROM[0:7]: This is the ROM of the target device or search path.
Num TX: This is the number of data bytes to transmit.
Num RX: This is the number of data bytes to receive.

Depending on the ROM function used the data returned can have different meanings. Refer to the following table for data definitions.

Table 5.2.23-2.

		Parameter	Data Returned
ROM Function:	Number	ROM	Bytes 0-7	Bytes 8-15

Search ROM	0xF0	List of branches to take.	Discovered ROM Code	1s indicate detected branches.
Read ROM	0x33	None	ROM read from device
Match ROM	0x55	The specific ROM
Skip ROM	0xCC
Alarm Search	0xEC