User's Manual
Table Of Contents
- Section 1 Introduction
- 1.1 Purpose of This Manual
- 1.2 General Description
- 1.3 General Specifications
- Section 2 Installation / Initial Turn-On
- 2.1 Introduction
- 2.2 Installation Checkboxes
- 2.3 Transmitter Cabinet Placement
- 2.4 Transmitter AC Connection
- 2.5 Signal and Ground Connections
- 2.6 Interlock Connections
- 2.7 3 Port Patch Panel
- 2.8 Motorized RF Switch Connections
- 2.9 Install PA and PS Modules
- 2.10 Initial Turn-On
- 2.11 Parallel Remote Control Connections
- 2.12 Remote Status Outputs, J15 & J16
- Section 3 Operation/ Adjustments
- 3.1 Introduction
- 3.2 Transmitter Control Panel
- 3.3 Graphical User Interface (GUI)
- 3.4 GUI Home Page
- 3.5 Drive Chain Main Menu
- 3.6 Power Amp Main Menu
- 3.7 Output Main Menu
- 3.8 Power Supply Main Menu
- 3.9 System Main Menu
- 3.10 GUI Menu Structures
- Section 4 Theory of Operation
- 4.1 Introduction
- 4.2 Block Diagram Descriptions
- 4.3 Transmitter Control System
- 4.4 Transmitter RF System
- 4.5 Power Supplies
- Section 5 Replacement Procedures
- 5.1 Introduction
- 5.2 PA Module Removal
- 5.3 PA Module Pallet Replacement
- 5.4 Power Supply Module Replacement
- 5.5 Circulator Removal/Replacement
- 5.6 Blower Assembly Removal
- Section 6 ISP (In-System Programming)
- 6.1 Introduction
- 6.2 Installing the ISP Program
- 6.3 ISP Procedures
- Section 7 Parts List
- 7.1 Parts List Index
10/19/07 888-2687-001 4-5
WARNING: Disconnect primary power prior to servicing.
Section 4 Theory of Operation
Ranger ™ Mobile Series
4.3.4 Controller Area Network (CAN) Bus
The Controller Area Network or CAN bus is a high speed serial communications link
which is used between the transmitter control boards for transmission of control, status,
fault and metering information. The CAN bus is distributed as part of the System
Control Bus (ribbon cable). The CAN bus can operate at speeds up to 1Mbps and is
designed to operate in hostile industrial environments. The transceivers feature cross
wire, loss of ground, over voltage and over temperature protections. A CAN transceiver
connected to the CAN bus is considered a Node. There can be up to 110 nodes on the
bus with a maximum bus length of about 40 meters for 1Mbps operation.
In a CAN system, data is transmitted and received using Message Frames. Message
Frames carry data from a transmitting node to one or more receiving nodes. The
messages transmitted from any node on a CAN bus do not contain addresses of either
the transmitting node or of any intended receiving node.
Instead, the content of each Message Frame (e.g. ON, OFF, PS 1 Voltage) is labeled by
an identifier that is unique throughout the network. All other nodes on the network
receive the message and each performs an acceptance test on the identifier to determine
if the message, and thus its content, is relevant to that particular node. If the message is
relevant, it will be processed; otherwise it is ignored.
The micro modules have a built in CAN controller which connects to a CAN
Transceiver which becomes a node on the CAN bus. The CAN transceiver interfaces
the single ended CAN controller to the differential CAN bus for high common mode
noise immunity, as shown in Figure 4-2. All of the control boards can send and receive
information over the differential CAN bus, however the Main Controller determines
what information is sent and when it is sent for this application.
NOTE:
There is an LED on the Main Controller, DS24, which will flicker on and off at a
random rate indicating that there is activity on the CAN bus. If the LED is off or
always on, then the CAN bus is most likely not communicating.
Figure 4-2 CAN Transceiver Diagram
1
8
7
6
5
4
3
2
Standby
Control
Reference
Voltage
Transmitter
Receiver
VREF
RXD
TXD
RS
CANH CANL
GND
VCC
TXD and RXD
connect to the
CAN controller
built into the
Micro Module
(Differential CAN Bus)