AutoGRAPH ON-BOARD CONTROLLER • USER MANUAL
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TechnoKom © 2016
RS-485 (TIA / EIA-485-A)
General Block Diagram of Connection of External Devices
to RS-485 Bus:
AutoGRAPH controller is equipped with two RS-485 (TIA/EIA-485-A) interfaces.
RS-485 is one of the most commonly used industrial standards of communication. A network
based on an RS-485 interface consists of transceivers connected with twisted pair wires. All
devices are connected to one twisted pair in the same manner: non-inverting outputs (A) to
one wire and inverting outputs (B) to another wire.
The controller allows up to 16 devices to be connected simultaneously to one RS-485
bus. There are many sensors, interfaces and expansion modules that are compatible with
the tracker’s firmware. Amongst such devices are: fuel level sensors (up to 8 sensors
simultaneously), passenger traffic metering system, input expander, display for messaging
with a vehicle driver, AutoGRAPH-CR device, temperature sensors which support MODBUS
protocol, etc.
The additional RS-485-2 bus is intended for photo cameras connection and connection
of external device, enabled by the device configuration. The current version of the device
firmware supports ridership data transmission via RS-485-2 bus.
Interaction with photo cameras is supported by controllers equipped with additional memory.
AutoGRAPH controller stores photos in an external microSD card.
RS-485-1 «A» (20)
ORANGE with WHITE STRIPE
RS-485-1 «B» (17)
BROWN with WHITE STRIPE
DEVICE (N)
DEVICE (2)
DEVICE (1)
CAMERA (N)
CAMERA (2)
CAMERA (1)
RS-485-2 «A» (25)
ORANGE with WHITE STRIPE
RS-485-2 «B» (22)
BROWN with WHITE STRIPE
RS-485-1
RS-485-2
