1-Wire Bus; Dc-Out - Logic IO RTCU MX2 turbo Technical Manual

RTCU MX2 turbo Technical Manual V2.04

1-Wire bus

The 1-Wire bus is available on the X2 connector. All 1-Wire communication goes through a single
connection, and all 1-Wire devices connected to this connection retrieves its power directly from
the bus (called parasitic power). For this only two wires are needed – the 1-wire signal and the
ground reference – allowing minimal cable installations.
For 1-Wire ID-Button readers, which include a built-in LED, a dedicated output is available for this
purpose. Please consult the RTCU IDE documentation for further information.
For further information regarding modular 1-wire concept, please refer to the document "Modular
1-Wire Concept Technical Manual" on the Logic IO webpage.
X2: 12 pin COM connector overview
Pin Name
1 1Wire
7 1W-LED
2 SGND
Specification of the 1-Wire bus:
Total weight1

DC-Out

A 3.3V DC output is available on the X2 connector. It is possible to control the output in order to
save power. The output is short circuit- (to ground), ESD- and transient protected. Make sure not
to exceed the current specification of the output and be aware that inrush currents of the external
equipment may exceed the specifications. It is recommended to install a fuse to protect the output.
This output must be enabled from the application. Please consult the RTCU IDE on-line manual for
more information.
X2: 12 pin COM connector overview
Pin Name
12 DC-Out
11 SGND
1 The term of weight has been described in "Modular 1-wire concept – Technical Manual" document.
Logic IO ApS.
Holmboes Allé 14
8700 Horsens
Denmark
Description
1-Wire bus
1-Wire ID-Button LED
Signal Ground
Description
+3.3V/150mA DC-Out for external equipment. (Shared with 6 pin
connector)
Signal Ground
Page 17 of 36
Max. Unit
65 m
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