Chapter - Johnston Visual Module
Page Issue 01
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V Range 501 ● 651 ● 801 - Operator’s Guide
Johnston Sweepers Limited
J-Plex-TheJohnstonSweeperControlSystem
J-Plex II is an electronic road sweeper control system which uses multiplex technology to enable
multiple control signals to be combined into one common signal which can then be transmitted
and received down a pair of wires (serial communication). This eliminates a substantial number of
wires and connections from the vehicle’s electrical system, which in turn reduces the size of wiring
harnesses and increases reliability. Wiring from Input/Output (I/O) devices such as switches or
hydraulic valves is via a local I/O collecting module called a node. On the V501, 651, 801 range of
sweepers, the J-Plex control system consists of a Johnston Visual Module (JVM) screen, 2 Key Pad
nodes, 3 remote I/O nodes and 2 HC nodes mounted around the sweeper. The JVM acts as the
master control unit and communicates between each external node via a CANbus control network.
JVM Provides:
The operator interface with the powerful diagnostic features provided by J-Plex.
The ability to check the status of Inputs and Outputs.
Information regarding the machine operating status, fuel tank contents, etc.
Data capture - hours sweeping, distance travelled, etc.
Fully customisable modern sweeping experience.
Clear display showing current operation status.
Direct communication with the Chassis.
Operating Instructions:
Throughout the J-Plex, pictorial icons are used to both confirm the current status and when
required communicate instructions.
M02OG-072
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LocationofJ-PlexComponents
1. Subframe Node
2. High Power Nodes
3. Powerpack Node
4. Systems Locker Node
5. Centre Console Node
6. Door Controller Node
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