EasySync S1-A-7001 User manual

EasySync Ltd
Unit 1, 2 Seaward Place, Centurion Business Park, Glasgow, G41 1HH, United Kingdom
Tel.: [phone] Fax: + 44 (0) 141 418 0110
E-Mail (Support): [e-mail] Web: http://www.easysync.co.uk
Neither the whole nor any part of the information contained in, or the product described in this manual, may be adapted or reproduced
in any material or electronic form without the prior written consent of the copyright holder. This product and its documentation are
supplied on an as-is basis and no warranty as to their suitability for any particular purpose is either made or implied. EasySync Ltd will
not accept any claim for damages howsoever arising as a result of use or failure of this product. Your statutory rights are not affected.
This product or any variant of it is not intended for use in any medical appliance, device or system in which the failure of the product
might reasonably be expected to result in personal injury. This document provides preliminary information that may be subject to
change without notice. No freedom to use patents or other intellectual property rights is implied by the publication of this document.
EasySync Ltd, Unit 1, 2 Seaward Place, Centurion Business Park, Glasgow, G41 1HH, United Kingdom. Scotland Registered Number:
SC224924
Copyright © 2009-10 EasySync Limited
EasySync Ltd
S1-A-7001 RS232 to 1-Port CANbus
Adapter
User Guide
Document Reference No.: ES_000008
Version 1.2
Issue Date: 2010-02-23
The S1-A-7001 provides a simple method of adapting CANbus devices to RS232.

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S1-A-7001 RS232 to 1-Port CANbus Adapter User Guide
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1Introduction ................................................................................... 4
1.1 Functional Description .................................................................................. 4
1.2 LED Description............................................................................................. 5
Block Diagram......................................................................................................... 6
1.2.1 Block description ....................................................................................... 6
1.3 Features........................................................................................................ 6
1.4 Performance Figures ..................................................................................... 7
1.5 Ordering Information .................................................................................... 7
2Installation..................................................................................... 8
2.1 Example Applications and Configurations ..................................................... 8
2.2 Hardware Installation ................................................................................... 8
2.2.1 Mounting.................................................................................................. 8
2.2.2 Wiring...................................................................................................... 8
2.3 Firmware Update .......................................................................................... 8
3Connections.................................................................................... 9
3.1 External Connectors ...................................................................................... 9
3.1.1 RS232...................................................................................................... 9
3.1.2 CANbus .................................................................................................... 9
4Application Programming Interfaces ............................................ 10
4.1 ASCII commands ........................................................................................ 10
4.1.1 Help (H, h or ?) ........................................................................................11
4.1.3 Set UART Baud Rate (U)............................................................................12
4.1.4 Set CAN Channel Timing –simple (S) .........................................................13
4.1.5 Set CAN Channel Timing –advanced (s)......................................................14
4.1.6 Set Acceptance Mask (m) ..........................................................................15
4.1.7 Set Acceptance Filter (M) ..........................................................................16
4.1.8 Enable Time Stamp (Z) .............................................................................17
4.1.9 Open CAN Channel (O)..............................................................................18
4.1.10 Open CAN Channel for Listen Only (L).........................................................19
4.1.11 Close CAN Channel (C)..............................................................................20
4.1.12 Echo / Synchronize (E)..............................................................................21
4.1.13 Transmit Standard CAN Frame –11-bit ID (t) ..............................................22
4.1.14 Transmit Extended CAN Frame –29-bit ID (T) .............................................23
4.1.15 Get Status Flags (F)..................................................................................24
4.1.16 Get Hardware and Firmware Versions (V) ....................................................25
4.1.17 Get Serial Number (N) ..............................................................................26

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4.1.18 Reset Microcontroller (R) ...........................................................................27
4.1.19 Prepare Bootloader (B)..............................................................................28
5Electrical details ........................................................................... 29
5.1 Power Requirements................................................................................... 29
5.2 CANbus ....................................................................................................... 29
5.3 RS232 ......................................................................................................... 29
6Mechanical Details........................................................................ 30
6.1 Module Mechanical Dimensions................................................................... 30
7Physical Environment Details ....................................................... 31
7.1 Storage ....................................................................................................... 31
7.2 Operating .................................................................................................... 31
8Environmental Approvals & Declarations...................................... 32
8.1 EMI Compatibility........................................................................................ 32
8.2 Safety ......................................................................................................... 32
8.3 Environmental............................................................................................. 32
8.4 Reliability.................................................................................................... 32
8.4.1 MTTF ......................................................................................................32
8.5 Import / Export Information....................................................................... 33
9Troubleshooting ........................................................................... 34
9.1 Hardware .................................................................................................... 34
Technical Support ................................................................................................. 35
10 Contact Information ..................................................................... 36
Appendix A –References ................................................................... 37
Appendix B - List of Figures and Tables ............................................. 38
Appendix C - Revision History ............................................................ 39

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1Introduction
1.1 Functional Description
The S1-A-7001 is a RS232 to CANbus adapter which operates at up to 1Mbps on both RS232 and CANbus
interfaces.
Each S1-A-7001 contains a small internal electronic circuit board mounted inside of a plastic case capable
of withstanding industrial temperature ranges. The integrated electronics include a Microchip PIC with the
ECAN controller. LEDs give a visual indication of the CANbus status.
The S1-A-7001 requires an external power supply with an input voltage range of +6VDC to +15VDC.
Figure 1.1 –S1-A-7001
Its small size allows the S1-A-7001 to be used in a variety of applications, from a portable adapter to
accompany a laptop to permanent installations in industrial and commercial locations.
The enclosure incorporates a DE-9S connector that allows connection to an RS232 device in DTE
configuration by using a straight-through cable. CANbus signals are available on an industry-standard
DE-9P connector conforming to the CAN-in-Automation (CiA) DS102-2 pin-out. The maximum CANbus
data rate is 1Mbps. RS232 data rates range from 2400bps to 460.8Kbps and 1Mbps.
Communications are accomplished with ASCII commands to the CAN controller. The ASCII commands
are listed in Section 4.1.

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1.2 LED Description
The S1-A-7001 uses three LEDs to indicate a valid link as well as CANbus status. The table below uses
the following LED definitions.
ON = LED constantly lit
OFF = LED is constantly not lit
Blinking = 2.5Hz, alternating ON and OFF
Single Flash = Short flash ON (200msec), followed by long off phase (1000msec)
Double Flash = Two short flashes on (200msec) separated by short off phase (200msec),
followed by long off phase (1000msec)
LED Color
Function
Description
Yellow
Power
Power LED
State
Description
Off
Inactive
No power is connected to the
S1-A-7001
On
Active
Power is connected to the S1-A-7001
Green
RUN
CAN Run LED
State
Description
Blinking
PREOPERATIONAL
The device initialized
Single flash
STOPPED
The device is in state STOPPED
(Channel is Closed)
On
OPERATIONAL
The device is in state OPERATIONAL
(Channel is Open)
Red
ERR
ERR LED State
Description
Category
Off
No error
The device is in working condition
Blinking
Invalid
Configuration
General configuration error
Single flash
Warning limit
reached
At least one of the error counters of
the CAN controller has reached or
exceeded the warning level (too many
error frames)
On
Bus off
The CAN controller is bus off, and not
involved in CANbus activities
Table 1.1 –LED Description
Upon initial power up, system reboot or executing the (R)eset command, the RED led will blink a number
of times depending on the baud rate of the RS232 port. See the “U” command in Section 4.1 for details.

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Block Diagram
RS232
Level Shifter
CANbus Controller
PIC18F2680
DE-9S
RS232
Connector
CANbus
Transceiver
MCP2551
DE-9P
CANbus
Connector
Figure 1.2 –S1-A-7001 Block Diagram
1.2.1 Block description
RS232 DE-9S Connector
This connector provides the interface for connection a RS232 device. Most PC RS232 ports or other
RS232 adapters are configured for DTE. The S1-A-7001 pin connection allows use of a straight-through
DE-9P to DE-9S cable. The S1-A-7001 can also be connected directly to a mating RS232 port with the
integral thumb-screws.
RS232 Level Shifter
The RS232 level shifter converts the bipolar signalling of RS232 and converts it to 5V logic which is
required by the CANbus Controller.
CANbus Controller
The Microchip PIC18F4680 runs firmware that converts the communication from the RS232 to CANbus
protocol.
CANbus Transceiver
The Microchip MCP2551 converts logic level signals from the CANbus controller to CANbus physical
signals. These signals consist of a differential pair, CAN_H and CAN_L.
DE-9P Connector (Male)
The DE-9P connector is configured in an industry standard (CiA DS102-2) pin-out to provide connection
to CANbus peripherals through standard cables. See Section 3.1.2.
1.3 Features
Adds one CANbus port by connecting to RS232
Easy installation and CANbus device connection
Supports Windows Server 2008, 2003, Vista, XP 2000, Linux, Mac OS X and any other operating
system that supports COM ports
Wide power supply input voltage range of +6VDC to +15VDC
CANbus speed up to 1Mbps
CANbus connector conforms to CiA DS102-2
LEDs indicate Initialization and CANbus status for monitoring port status & easy diagnostics
High-temperature plastic enclosure
Operating temperature of -40°C to +85°C

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1.4 Performance Figures
Parameter
Performance
RS232 Interface
2.4Kbps, 9.6Kbps, 19.2Kbps, 38.4Kbps, 57.6Kbps (default), 115.2Kbps,
230.4Kbps, 460.8Kbps and 1.0Mbps.
CANbus Interface
10Kbps to 1Mbps
Table 1.2 –Performance Figures
1.5 Ordering Information
Part Number
Description
S1-A-7001
CAN-Plus RS232 to 1-Port CANbus Adapter
Table 1.3 –Ordering Information

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2Installation
2.1 Example Applications and Configurations
2.2 Hardware Installation
There are no switches or jumpers to configure on the S1-A-7001.
2.2.1 Mounting
The S1-A-7001 can be installed in-line with a standard RS232 DE-9P to DE-9S straight-through cable. It
can also be attached directly to the back of a host computer DE-9P RS232 port.
2.2.2 Wiring
Connect the DE-9S connector to a RS232 port.
The CANbus interface is provided through a DE-9P connector as defined by the CiA DS102-2 pin-out. Bus
termination is not provided. A CANbus network requires 120Ωtermination resistors at each end as noted
in Figure 2.3. Wiring to CANbus nodes through the middle of the network must ensure a short tap
length.
Figure 2.1 –Canbus Network
2.3 Firmware Update
The S1-A-7001 firmware can be updated for bug fixes and enhanced features. In order to update the
firmware, obtain the updated firmware from the EasySync web site and follow the instructions contained
in the readme file of the download.
120
CANNODE
CANNODE CANNODE
CANNODE
TwistedPair
120

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3Connections
3.1 External Connectors
3.1.1 RS232
The S1-A-7001 is configured to allow use of a straight-through 9-pin RS232. It can also be directly
connected to a host computer port. RS232 signal names are defined in Table 3.1.
Pin Number
Pin Type
Description
2
Input
RXD = RS232 Data INPUT
3
Output
TXD = RS232 Data OUTPUT
5
Ground
GND = RS232 signal ground
7
Input
CTS = RS232 Handshake INPUT
8
Output
RTS = RS232 Handshake OUTPUT
Table 3.1 –RS232 Pin-Out
3.1.2 CANbus
The CANbus port conforms to the CiA DS102-2 pin-out through a 9-contact D-Sub Pin connector. Pin
assignments are noted below:
Pin Number
Pin Type
Description
1
n/a
Not Connected
2
Bidirectional
CAN_L - CANbus low-side signal of differential pair
3
Ground
Signal Ground
4
n/a
Not Connected
5
Ground
Signal Ground
6
Ground
Signal Ground
7
Bidirectional
CAN_H –CANbus high-side signal of differential pair
8
n/a
Not Connected
9
PWR
+6V to +15V Battery Supply Voltage
Table 3.2 –DE-9P DS102-2 CANbus Pin-Out

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4Application Programming Interfaces
4.1 ASCII commands
The following ASCII commands provide a means of utilizing an interactive terminal program, or
communication through a standard COM or TTY port. Unrecognized commands return the ASCII BELL
character (0x07). Some useful settings for a terminal program to assist in the human readability of
command responses are:
-Echo typed characters locally –the S1-A-7001 does not echo characters.
-Append line feeds to incoming carriage returns (0x0D).
-The S1-A-7001 defaults to 57.6Kbps RS232 communications. If a different RS232 bit rate is
chosen, that rate will be the new default on subsequent power cycles.
The CAN messages are received at all times by default and are sent on the RS232 port immediately. The
firmware version 2.2 supports sustained read of CAN messages sent 1ms apart as well as a burst of up to
100 CAN messages sent 50us apart.

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4.1.1 Help (H, h or ?)
Summary
Lists available commands.
Definition
H<CR>, h<CR> or ?<CR>
Parameters
None
Remarks
Example:
?<CR>
List available commands.
Return Codes
List of Supported Commands
O - Open CAN Channel
C - Close CAN Channel
t - Transmit Standard Frame
T - Transmit Extended Frame
F - Read Status Flag
V –S1-A-7001 Version
N - Serial Number of S1-A-7001
Z - TimeStamp Option On/Off
S - Set CAN Bit Rate
s - Set BRGCON Registers
m - Set Acceptance Mask
M - Set Acceptance Filter
B - Enter Bootload Mode
L - Set Listen Mode
E - Clear Buffers and Echo Char
R - Reset S1-A-7001
U –Set UART Baud Rate
H, ? or h - Help on S1-A-7001 Commands
<CR> = OK
<BELL> = ERROR

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4.1.3 Set UART Baud Rate (U)
Summary
Configure RS232 interface with a chosen baud rate. This rate is independent of the CANbus baud
rate. The RS232 baud rate is stored and retained across power cycles.
Upon power-up or reset (R) of the S1-A-7001, the RED LED will flash a given number of times.
NOTE: Ensure the attached RS232 device can be configured for the new baud rate prior to using
this command. Failure to do so may result in an unusable configuration. Many terminal
programs do not have settings beyond 115.2Kbps. The 1.0Mbps setting cannot be used with a
COM port set to 921.6Kbps.
Definition
Urate_selector<CR>
Parameters LED Flash on Power-Up / Reset
rate_selector = 0 = 230.4Kbps 1
1 = 115.2Kbps 2
2 = 57.6Kbps (default) 3
3 = 38.4Kbps 4
4 = 19.2Kbps 5
5 = 9.6Kbps 6
6 = 2.4Kbps 7
7 = 460.8Kbps 8
8 = 1.0Mbps 9
Remarks
Example:
U5<CR>
Set RS232 transmission rate to 9.6Kbps
Return Codes
<CR> = OK
<BELL> = ERROR

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4.1.4 Set CAN Channel Timing –simple (S)
Summary
Configure CAN interface with a pre-configured channel transmission rate.
NOTE: The CAN channel will revert to its prior state after execution. For example if the channel
is Open when this command is executed, the channel will update the setting and return to the
Open state.
Definition
Srate_selector<CR>
Parameters
rate_selector = 0 = 10Kbps
1 = 20Kbps
2 = 50Kbps
3 = 100Kbps
4 = 125Kbps
5 = 250Kbps
6 = 500Kbps
7 = 800Kbps
8 = 1Mbps (default)
Remarks
Example:
S5<CR>
Set CAN transmission rate to 250Kbps
Return Codes
<CR> = OK
<BELL> = ERROR

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4.1.5 Set CAN Channel Timing –advanced (s)
Summary
Configure CAN interface with a custom channel transmission rate.
NOTE: The CAN channel will revert to its prior state after execution. For example if the channel
is Open when this command is executed, the channel will update the setting and return to the
Open state.
Definition
Saabbcc<CR>
Parameters
aa = contents of PIC 18F4680 BRGCON1 register (in hexadecimal)
bb = contents of PIC 18F4680 BRGCON2 register (in hexadecimal)
cc = contents of PIC 18F4680 BRGCON3 register (in hexadecimal)
Remarks
The S1-A-7001 utilizes a 24MHz clock for the PIC 18F4680. Use this value when referring to the
PIC datasheet if a custom transmission rate different from those provided with the “S” command
above is required.
Example:
s01BE07<CR>
Set CAN transmission rate to 250Kbps.
NOTE: With this command, multiple combinations of BRGCON1, BRGCON2 and BRGCON3 can
yield the same bit rate.
Return Codes
<CR> = OK
<BELL> = ERROR

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4.1.6 Set Acceptance Mask (m)
Summary
The Acceptance Mask, in conjunction with the Acceptance Filter (M), defines which received
messages (i.e. of a specific ID or range of CAN IDs) will be passed to the RS232 interface. The
Acceptance Mask value corresponds to bits within a range of valid CAN IDs for either standard or
extended CAN messages.
Set Acceptance Mask (m) command should be executed prior to Set Acceptance Filter (M).
NOTE: The CAN channel will revert to its prior state after execution. For example if the channel
is Open when this command is executed, the channel will update the setting and return to the
Open state.
Definition
miii<CR> for standard 11-bit CAN messages
miiiiiiii<CR> for extended 29-bit CAN messages
Parameters
iii = standard 11-bit CAN mask (0x000 through 0x7FF)
iiiiiiii = extended 29-bit CAN mask (0x00000000 through 0x1FFFFFFF)
A value of “0” in a bit location indicates that the bit location ID value is to be ignored
when filtering messages.
Default is to pass all frames (Acceptance Mask = 0x000 for standard messages and
0x00000000 for extended messages)
Remarks
Example
m700<CR>
Set Acceptance Mask to check bits 10, 9 and 8 against the filter. Bits 7 thorugh 0 are ignored as
“don’t care”. Use the Acceptance Mask in conjunction with the Acceptance Filter, defined next.
Return Codes
<CR> = OK
<BELL> = ERROR

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4.1.7 Set Acceptance Filter (M)
Summary
The Acceptance Filter, in conjunction with the Acceptance Mask (m), defines which received
messages (i.e. of a specific ID or range of CAN IDs) will be passed to the RS232 interface. The
Acceptance Filter value corresponds to a valid CAN ID for either standard or extended CAN
messages.
The Set Acceptance Mask (m) command should be executed prior to the Set Acceptance Filter
(M) command.
NOTE: The CAN channel will revert to its prior state after execution. For example if the channel
is Open when this command is executed, the channel will update the setting and return to the
Open state.
Definition
Miii<CR> for standard 11-bit CAN messages
Miiiiiiii<CR> for extended 29-bit CAN messages
Parameters
iii = standard 11-bit CAN ID (0x000 through 0x7FF)
iiiiiiii = extended 29-bit CAN ID (0x00000000 through 0x1FFFFFFF)
Default is to pass all frames (Acceptance Filter = 0x7FF for standard messages and
0x1FFFFFFF for extended messages).
Remarks
Example
M1FF<CR>
Set Acceptance Filter to receive standard messages with the CAN ID of 0x1FF. If used in
conjunction with the Acceptance Mask example above, frames of the range 0x100 through 0x1FF
will be passed and all other CAN IDs blocked.
Return Codes
<CR> = OK
<BELL> = ERROR

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4.1.8 Enable Time Stamp (Z)
Summary
Sets or clears time stamp on received frames. This value is persistent in EEPROM across reset or
restart. Four (4) bytes are added to the end of a received frame. This value is a rolling 16-bit
counter that increments once every millisecond and rolls over at 60,000mS (1 minute). Valid hex
values are 0x0000 through 0xEA5F.
NOTE: The CAN channel will revert to its prior state after execution. For example if the channel
is Open when this command is executed, the channel will update the setting and return to the
Open state.
Definition
Zn<CR>
Parameters
n = 0 = disable time stamp feature
1 = enable time stamp feature
Remarks
Default is OFF (disable time stamp)
Only use when required to change functionality.
Example:
Z1<CR>
Enable time stamp.
Return Codes
<CR> = OK
<BELL> = ERROR

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4.1.9 Open CAN Channel (O)
Summary
Opens CAN channel for read/write operations. CAN channel must be initiated with selected speed
(S or s) prior to use of Open.
Definition
O<CR>
Parameters
None
Remarks
Example:
O<CR>
Open CAN channel in normal communication mode.
Once the CAN channel is open, it is necessary to execute the Echo/Synchronize (E or e)
command to flush the data buffers. Once the CAN channel is synchronized, received data is
automatically sent from the CAN network to the controlling application.
Return Codes
<CR> = OK
<BELL> = ERROR

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4.1.10 Open CAN Channel for Listen Only (L)
Summary
Opens the CAN channel in Listen Only mode. This is essentially the same as Open, although
attempts to use either Transmit command (T or t) will result in an error. Listen Only mode is
useful for monitoring the CAN channel without interaction from the CAN bus. CAN channel must
be initiated with selected speed (S or s) prior to use of Listen.
When in Listen mode, the channel must first be Closed (C) and then opened with Open (O) prior
to attempting to transmit frames.
NOTE: A minimum of three nodes are required on the CANbus network for Listen mode to
function.
Definition
L<CR>
Parameters
None
Remarks
Example:
L<CR>
Open CAN channel in Listen Only mode
Received data is automatically sent from the CAN network to the controlling application.
Return Codes
<CR> = OK
<BELL> = ERROR

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4.1.11 Close CAN Channel (C)
Summary
Closes the CAN channel. This command provides backward compatibility with some existing
CANbus adapters.
Definition
C<CR>
Parameters
None
Remarks
Example:
C<CR>
Close CAN channel.
Return Codes
<CR> = OK
<BELL> = ERROR