RT-ANA RT3000 User manual
Confidently. Accurately.
RT-AN
A
Analogue
Interface
for the
RT3000
User Manual
2 Oxford Technical Solutions
Legal Notice
Information furnished is believed to be accurate and reliable. However, Oxford
Technical Solutions Limited assumes no responsibility for the consequences of use of
such information nor for any infringement of patents or other rights of third parties
which may result from its use. No license is granted by implication or otherwise under
any patent or patent rights of Oxford Technical Solutions Limited. Specifications
mentioned in this publication are subject to change without notice and do not represent
a commitment on the part of Oxford Technical Solutions Limited. This publication
supersedes and replaces all information previously supplied. Oxford Technical
Solutions Limited products are not authorised for use as critical components in life
support devices or systems without express written approval of Oxford Technical
Solutions Limited.
All brand names are trademarks of their respective holders.
Copyright Notice
© Copyright 2004, Oxford Technical Solutions.
Revision
Document Revision: 040510 (See Revision History for detailed information).
Contact Details
Oxford Technical Solutions Limited
77 Heyford Park
Upper Heyford
Oxfordshire
OX25 5HD
Tel: 01869 238 015
Fax: 01869 238 016
http://www.oxts.co.uk
mailto:[email protected]
RT-ANA User Manual
Revision: 040510 3
Table of Contents
Introduction 4
Scope of Delivery 5
Specification 6
Warranty 7
Functional Overview 8
Configuration 9
Command Syntax 11
Connections 15
Revision History 19
4 Oxford Technical Solutions
Introduction
The RT-ANA unit is an interface converter that accepts CAN messages from the
RT3000 and converts them to analogue voltages. The RT-ANA has up to 16 analogue
output channels with a range of ±10V. The RT-ANA uses precision 16-bit DACs and
precision op-amp drivers to ensure the highest levels of accuracy can be achieved.
The outputs are presented on 16 BNC connectors and on a 25-way D-type connector.
Either output can be used and they are connected internally.
The configuration for the analogue outputs is performed in the RT3000; the RT-ANA
decodes four, 8-byte CAN messages and turns them in to voltages. The only user
configuration parameters are the CAN baud rate and the fast-update mode.
The RT-ANA includes galvanically isolated power supplies on the analogue side to
ensure that there are no ground loops. This power supply is not intended to have large
D.C. offsets between the earth and the analogue outputs since the EMC filters have a
working voltage of 25V. The isolation is suitable for use in vehicles.
The RT-ANA has an indicator LED to show that it is receiving CAN messages and
working correctly.
RT-ANA User Manual
Revision: 040510 5
Scope of Delivery
Table 1, below, lists all the items that are delivered with each RT-ANA unit.
Table 1. Summary of the RT-ANA Components
Qty Description
1 RT-ANA Unit
1 77C0002B Power Cable
1 14C0037A CAN Cable
1 Null Modem Serial Cable (for configuration)
Figure 1. RT-ANA Components
6 Oxford Technical Solutions
Specification
The technical specification of the RT-ANA unit is shown in Table 2, below.
Table 2. Technical Specification
Parameter Specification
Input CAN
Calculation Delay16.6ms (low latency mode), 16.6ms (fast-update mode)
Outputs 16 Analogue Channels
Output Rate 100 Hz (low latency mode), 1.6kHz (fast-update mode)
Output Range ±10V
Output Accuracy 1mV
Output Resolution 16-bits, 320mV
Power 3W, 9 – 18V d.c.
Operating Temperature 0 to 60°C
Relative Humidity 95%, non-condensing
Shock (Survival) 1000g, 5 ms half-sine
Note 1: Delays depend on the CAN bus, these figures assume a 1MBit/s CAN bus speed. Add an
additional 1.8ms for a 500kBit/s CAN bus.
RT-ANA User Manual
Revision: 040510 7
Warranty
Oxford Technical Solutions Limited warrants the RT3000 products to be free of defects
in materials and workmanship, subject to the conditions set forth below, for a period of
one year from the Date of Sale.
‘Date of Sale’ shall mean the date of the Oxford Technical Solutions Limited invoice
issued on delivery of the product. The responsibility of Oxford Technical Solutions
Limited in respect of this warranty is limited solely to product replacement or product
repair at an authorised location only. Determination of replacement or repair will be
made by Oxford Technical Solutions Limited personnel or by personnel expressly
authorised by Oxford Technical Solutions Limited for this purpose.
In no event will Oxford Technical Solutions Limited be liable for any indirect,
incidental, special or consequential damages whether through tort, contract or
otherwise. This warranty is expressly in lieu of all other warranties, expressed or
implied, including without limitation the implied warranties of merchantability or
fitness for a particular purpose. The foregoing states the entire liability of Oxford
Technical Solutions Limited with respect to the products herein.
8 Oxford Technical Solutions
Functional Overview
The RT-ANA responds to four specific CAN-bus messages sent by the RT3000. Table
3, below, shows the default, factory configured identifiers used by the RT3000 and the
RT-ANA.
Table 3. CAN Identifiers used by the RT3000 and RT-ANA
Identifer Channels
610h Channel 0 to 3
611h Channel 4 to 7
612h Channel 8 to 11
613h Channel 12 to 15
The RT3000 encodes the desired voltage of each channel into these CAN messages. All
the configuration for the channel data is performed by the RT3000, not the RT-ANA.
Status LED
The Status LED on the front panel gives some indication whether the RT-ANA is
operating correctly or not. The following paragraphs describe the operation of the
Status LED.
Power-Up. At Power-Up the LED is green but it quickly changes to red when the
software in the RT-ANA boots. If the LED remains green after the power has been put
on then the RT-ANA will not work correctly.
Waiting for CAN. The LED will remain red until 100 valid CAN messages have been
decoded. CAN messages not intended for the RT-ANA will not count and will not
change the LED state.
CAN Running. The LED will flash Orange/Off every 100 CAN messages (100 Orange
then 100 Off). Since the RT3000 updates at 100Hz and there are 4 CAN messages per
update, the LED will cycle with a frequency of 2Hz.
RT-ANA User Manual
Revision: 040510 9
Configuration
There are two configuration parameters that may need changing by the user before
operation begins. These are the CAN baud rate (so it matches the RT3000 and the other
devices on the bus) and the fast-update mode.
To configure the RT-ANA a serial terminal program is required. Windows comes with
HyperTerminal, but other suitable programs can also be used.
Using the Null-Modem Serial Cable, connect the Configuration port of the RT-ANA to
a serial port a PC. Run your serial terminal program and configure the settings as listed
in Table 4, below.
Figure 2. RT-ANA Configuration Output at Start-up
10 Oxford Technical Solutions
Table 4. Serial Terminal Settings
Parameter Specification Example from Hyperterminal
Baud Rate 19200
Data Bits 8
Parity None
Stop Bits 1
Flow Control None
Apply power to the RT-ANA, the terminal will respond as shown in Figure 3, below.
Table of contents
