CAN 2.0A/B â RS232/RS485 Converter

CAN 2.0A/B ↔ RS232/RS485 Converter 

(Prod. No. #632) 

- Listen Only Mode – 

No influence of the CAN system by the converter 

or 

- Normal Mode – 

A/B 11, 29 Bit ID 

CAN-side: 10 kbps ... 1 Mbps 

RS232- side: up to 1 Mbps 

RS485- side: up to 3 Mbps

Table of Contents 

Table of Contents.....................................................................................................................................2 

1 Introduction...........................................................................................................................................3 

2 Startup...................................................................................................................................................4 

3 Converter Block Diagram.......................................................................................................................5 

4 Setup Mode............................................................................................................................................5 

5 Normal Mode.........................................................................................................................................7 

6 Converter ASCII Commands...................................................................................................................9 

7 Technical Specifications: CAN ↔ RS232/RS485 Adapter (#630)........................................................12

1 Introduction 

As a powerful tool the CAN converter supports development, service, testing and maintenance of 

CAN-based systems. They are suitable for online monitoring and manipulation of the bus as well as 

their logging. 

The converter supports 11 and 29 bit identifiers (CAN2.0A/2.0B). The Listen Only mode it is no 

transmission of Ack bit and error frames, thereby influencing the CAN system is avoided. 

The CAN baud rate is detected automatically by the converter. As well the converter provides the 

ability to adjustthe baud rate and other parameters to your needs. 

The CAN Converter is ideally suitable for the investigation of the CAN bus data. The converter can be 

easily plugged into any RS232 or RS485 port of a computer or notebook. The data can be displayed 

in any standard terminal program or the 4N-CAN-terminal program. 

More information can be found in the following sections.

2 Startup 

Before first use: 

• Connect converter on RS232/RS485 side with your pc RS232/RS485-port 

• Connect CAN-side with your application 

• Start the terminal program 

In our download area you will find the converter optimized for the terminal program: 4N-GX 

CAN-Terminal 

• Choose the right COM port 

• Set COM port to 38600 Baud 8N1 

• Power on the converter 

• Send within 5 seconds a "s" (initiates the setup mode) 

• The converter responds "CAN2.0 – RS232/RS485 Converter V4.4" 

• Send "h" for help output in the terminal 

• Set CAN side configuration as needed 

• Send "E" - Stores settings in the flash and restarts the converter. ( - corresponds to 

"Enter" key) 

• Done 

Important: 

Sending a "s" within 5 seconds switches the converter into setup mode. Options of this mode will be 

described later. "E" or "Q" ends the setup mode. 

E - Saves Configuration to the converters flash memory, and exits the setup mod 

Q - Exit without saving 

For the operation of the converter, the following setup parameters must be set correctly: 

• CAN Baudrate (or Autobaud) 

• ID (results in 11- or 29-Bit Format) 

• Acceptance-Code 

• Acceptance-Mask 

• RS232/RS485 Baudrate

4.1 CAN ID Filter Setup 

The converters accept messages from specific IDs which can be defined by the CAN identifier (CI), the 

CAN-Acceptance-Code (CAC) and the CAN-Acceptance-Mask (CAM). CAC defines the mandatory 

required bits of the received ID and the CAM, the bits to ignore. The CAN identifier 

can be determined by the choice of converter id to whether either will be accepted ONLY 11 

bits (id

4.2 CAN Modes 

The converter is in Listen Only mode or normal mode to operate. 

L = 1 Listen Only Mode (read without ACK) L = 0 Normal Mode (read and write) 

5 Normal Mode 

If the converter powered on and the setup mode is not initiated within 5 seconds, it starts in 

normal mode. In this mode, the communication of the CAN bus can be monitored (chapter: 

5.2 Receive Data) and data be transmitted to the bus (chapter: 5.1 Sending Data). 

5.1 Sending Data 

All Data, sent from the computer to the COM port, will be output on the CAN bus. 

The following formats are used: 

ID CR space = $20 (Space "_") CR = $ 0D (Enter "") - ID without Data 

ID space Data CR space = $20 (Space "_") CR = $ 0D (Enter "") - ID with Data 

With the converter setting: 

CAN-Identifier = 1F000000 (29 Bit CAN-Identifier) 

the following data is output: (11 and 29 bit messages) 

Input 

Meaning 

7E8_0001020304 CAN ID 7E8 Data 00 01 02 03 04 Data Length 5 

7E8_0 CAN ID 7E8 no Data Data Length 0 

7E8_01_01 CAN ID 7E8 Data 01 Data Length 1 

1FFFFFFF_010203_03 CAN ID 1FFFFFFF Data 0102030 Data Length 3 

10001234_0102_02 CAN ID 10001234 Data 01020 Data Length 2 

With the setting: 

CAN-Identifier = 1FF (11 Bit CAN-Identifier) 

the following data is output: (only 11 bit CAN messages) 

Input 

Meaning 

7E8_0001020304_05 CAN ID 7E8 Data 00 01 02 03 04 Data Length 5 



In case of 11 bit ID no 29 bit ID messages will be sent! 

5.1.1 Send Error 

If data is sent in the wrong format to the converter through the USB/COM port, it can be recognized 

by the converter response "S" (Enter "S" Enter). 

e.g.: 1FFFFFFF_010 

Converter response: "S" 

(incomplete data, 0101 would be correct)

5.2 Receiving Data 

What data received by the converter and at RS232/RS485 side are output for further processing 

depends on the configuration of the CAN identifier, the CAM-Acceptance-Code and the CAN- 

Acceptance-Mask. A detailed description of these parameters can be found with examples in 

chapter "3.1 CAN ID Filter Setup". 

Accepted CAN messages will be output in ASCII format as followed: 

ID space Data space Length CR 

space = $20 (Space "_") CR = $ 0D (Enter "") 

With the converter setting: 

CAN-Identifier = 1F000000 (29 Bit CAN-Identifier) 

CAN-Acceptance-Code = 00000000 (0 receives all CAN-Frames) 

CAN-Acceptance-Mask = FFFFFFFF (F receives all CAN-Frames) 

the following data is output on the USB side: (11 and 29 bit message) 

PC Output 

Meaning 




1FFFFFFF_010203_03 CAN ID 1FFFFFFF Data 0102030 Data Length 3 

10001234_0102_02 CAN ID 10001234 Data 01020 Data Length 2 

With the setting: 

CAN-Identifier = 1FF (11 Bit CAN-Identifier) 

CAN-Acceptance-Code = 00000000 (0 receives all CAN-Frames) 

CAN-Acceptance-Mask = FFFFFFFF (F receives all CAN-Frames) 

the following data is output: (only 11 bit CAN messages) 

PC Output 

Meaning 




5.2.1 Receive Error 

Error LED (Buffer Overflow LED) lights up, if data is sent to fast from the PC to the converter. 

Buffer Overflow can be recognized by "E" (Enter "E" Enter). 

"E" is send from converter to PC. 

At full CAN bus utilization can rarely cause errors (at 1 Mbps 100% bus utilization). 

To recognize this is the fact that the messages are not received in full. 

z.B. 

7E8_000102 CAN ID 7E8 Data 00 01 02 ? Data Length? 

7E8_01 CAN ID 7E8 Data 01 ? Data Length?

6 Converter ASCII Commands 

(CR)=Enter (Dez=13, Hex=0D) 

Es können Klein- und Großbuchstaben verwendet werden. 

Befehl 

Funktion 

S S Setup-Mode activation 

P 

C 

P0(CR) 

P1(CR) 

C0(CR) 

C1(CR) 

C2(CR) 

C3(CR) 

C4(CR) 

C5(CR) 

C6(CR) 

C7(CR) 

C8(CR) 

C9(CR) 

CA(CR) 

CB(CR) 

CC(CR) 

CD(CR) 

CE(CR) 

CF(CR) 

Is possible only after power up in the first 5 seconds! In setup mode, 

settings for the CAN side can be made and stored. 

Shows settings stored in converter RAM – changes have to be saved 

by "E" xit 

Show default settings. 

Response: “Settings: List(CR)OK(CR)“ or “ERROR(CR)“ 

e.g. 

C CAN-Bitrate : 5 

L CAN-Mode : 0 

I CAN-Identifier : 10000000 

A CAN-Acceptance-Code : 00000100 

M CAN-Acceptance-Mask : 00000000 

R Baudrate : 3 

Identifier Length : 29 

Acc. Code Length : 32 

Acc. Mask Length : 32 

OK 

10 kbps CAN Bitrate 




62,5 kb CAN Bitrate 



128,2 kb CAN Bitrate 





1.0 Mbps CAN Bitrate Other baud rates available on request 

Autobaud – automatic baudrate Detection 



Response: “Settings: List(CR)OK(CR)“ or “ERROR(CR)“

Befehl 

I 

Ixxx(CR) 

or 

Ixxxxxxxx(CR) 

Funktion 

Identifier in Hex (000...7FF) 

11 Bit Standard Format 

or 

Identifier in Hex (00000000...1FFFFFFF) 29 Bit Extended Format 

L Lx(CR) Listen Mode Only (0...1) 

This setting determines whether only 11-bit or 11-bit and 29-bit are 

accepted by CAN-Acceptance-Code and CAN-Acceptance-Mask. 

Response: “List of parameters: (CR)OK(CR)” or “ERROR(CR)“ 

0 – CAN Normal Mode (read and write) 

1 – CAN Listen Only Mode (listening only, read) 


A Axxxxxxxx(CR) CAN-Acceptance-Code x = (0...000007FF) 11 Bit Standard Format 

CAN-Acceptance-Code x = (0...1FFFFFFF) 29 Bit Extended Format 

x = 0 receives all CAN-Frames 


M Mxxxxxxxx(CR) CAN-Acceptance-Mask x = (0..000007FF) 11 Bit Standard Format 

CAN-Acceptance-Mask x = (0..1FFFFFFF) 29 Bit Extended Format 

R 

V 

N 

R0(CR) 

R1(CR) 

R2(CR) 

R3(CR) 

R4(CR) 

R5(CR) 

R6(CR) 

R7(CR) 

R8(CR) 

R9(CR) 

RA(CR) 

RB(CR) 

RC(CR) 

RD(CR) 

RE(CR) 

RF(CR) 

x = F receives all CAN-Frames 


600 bps RS232/RS485 Baudrate (all 8 N 1) 

1200 bps 

2400 bps 

4800 bps 

9600 bps 

19200 bps 

38400 bps 

57600 bps 

115200 bps 

230000 bps 

500000 bps 

600000 bps 

750000 bps 

1000000 bps 

1500000 bps 

3000000 bps Other baud rates available on request 

Response: “ (CR)OK(CR)” or “ERROR(CR)” 

Software Version Number 

Response: „Software Version: x.x(CR)“ 

Converter Nummer 

x = 0..F 

Response: „Converter-ID: xxxx xxxx(CR)“ x= 0..F

Befehl 

? 

or 

H 

? 

or 

H 

Funktion 

Help 

This table is output to the COM port 

E E Exit 

Exits the Setup Mode and saves the configuration in flash memory of the 

converter, followed by a Reset = Power On(Restart) 

Response: e.g. 

C CAN-Bitrate : 5 

L CAN-Data Length : 8 

I CAN-Identifier : 1F0000000 

A CAN-Acceptance-Code : 00000100 

M CAN-Acceptance-Mask : 00000000 

R USB-Baudrate : 3 

Identifier Length : 29 

Acc. Code Length : 32 

Acc. Mask Length : 32 

SAVE to EEprom 

OK 

RESET 

Q Q Quit 

Exits the setup mode WITHOUT saving changes in the in flash memory of 

the converter, followed by a Reset = Power On(Restart) 

Response: 

OK 

RESET 

Other parameters, functions are available on request.

7 Technical Specifications: CAN ↔ RS232/RS485 Modul (#632) 

Product: CAN2.0 RS232 & RS485 High Speed Isolated Modul #632 

PC Software: 

PC Software Docu: 

Connector 1: 

Connector 1 Pins: 

Terminator: 

4N-GX CAN-Terminal 

4N-GX CAN-Terminal-v2.05-germany 

4N-GX CAN-Terminal-v2.05-english 

CAN 2.0A/B: 

High speed vollisolierter CAN 2.0A & 2.0B Bus 

Slope-Control Mode to Reduce EMI 

Thermal Shutdown, Current Limiting 

ISO 11898 Standard, CAN 2.0A & 2.0B 

Klemme B - CAN_L 

Klemme D - CAN_H 

Klemme C - GND_CAN 

120 R - between CAN_L and CAN_H (intern) 

CAN 2.0 baudrates: 10 Kbps 

20 Kbps 

25 Kbps 

50 Kbps 

62,5 Kbps 

100 Kbps 

125 Kbps 

250 Kbps 

500 Kbps 

800 Kbps 

1.0 Mbps 

oder 

Autobaud 

Connector 2: 

RS232: 

±15 kV Human Body Model 

±8 kV IEC 1000-4-2, Contact Discharge 

±15 kV IEC 1000-4-2, Air-Gap Discharge 

Latchup Free 

1 Mbps Data Rate 

EIA/TIA-232 Specifications Down to 3.0 V 

RS485 Receiver: 

+/- 15 kV Human Body Model 

+/- 6 kV IEC 1000-4-2, Contact Discharge 

+/- 12 kV IEC 1000-4-2, Air-Gap Discharge 

Allow Up to 128 Receivers on the Bus

True-Fail-Safe Receiver 

-7V .. +12V Common-Mode Range 

Thermal Protection Against Output Short Circuit 

RS485 Driver: 

+/- 9 kV Human Body Model 

Slev-Rate Limited for Errorless Data Transmission 

-7V .. +12V Common-Mode Range 

Current Limiting 

Thermal Shutdown for Driver-Overload Protection 

Connectron 2 Pins: 


Klemme M - RXD In 

Klemme K - TXD Out 

Klemme A - GND_RS 


Klemme J - TX+ Out 

Klemme L - TX- Out 

Klemme H - RX+ In 

Klemme G - RX- In 

Klemme A - GND_RS 

Connector 3: 

Connector 3 Pins: 

RS232 & RS485 

baudrates: 

Power In 

Power In: 

Klemme E - 9..36V DC oder AC Input 

Klemme F - 9..36V DC oder AC Input 

600 bps (all 8 N 1) 

1200 bps 

2400 bps 

4800 bps 

9600 bps 

19200 bps 

38400 bps 

57600 bps 

115200 bps 

230000 bps 

500000 bps 

600000 bps 

750000 bps 

1000000 bps 

1500000 bps 

3000000 bps 

RS232 up to 1 Mbps, RS485 up to 3 Mbps 

Galvanic isolation: 

High common-mode transient immunity: >25 kV/µs 

Safety and regulatory approvals

UL recognition: 5000 V rms for 1 minute per UL 1577 

CSA Component Acceptance Notice #5A 

IEC 60950-1: 600 V rms (reinforced) 

IEC 60601-1: 250 V rms (reinforced) 

VDE certificate of conformity 

DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 

VIORM = 846 V peak 

Indicators: 

Poerating tmperatur: 

Dimensions 

Run LED 

CAN LED 

RS232/RS485 LED 

Buffer Overflow LED 

-5..+70°C 

(mm) 90 x H 75 x B 23 for Rail Din

CAN 2.0A/B â RS232/RS485 Converter

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CAN 2.0A/B â RS232/RS485 Converter