3onedata CAN232 Benutzerhandbuch - Seite 2

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Front and Rear view

Side view

1. RS-232 Serial port (DB9F)

2. Power input terminal block

3. CAN-Bus Link/ACT LED

4. Serial port transmits and receives data LED

5. Power indicator

6. Wallmount screw hole

7. Equipment information

8. CAN-Bus port terminal block

9. DIP switch

【Dimension】

Unit (mm)

【Power supply input】

CAN232 interface converter provide DC power input, voltage

input is the two terminal form, plug type 2 core spacing of

5.08mm terminals, wherein the power input range of 9 ~ 48VDC.

The power support is not polarity that the device can still work

normally after the reverse.

【DIP switch】

The converter front panel provide 4 bit DIP switch to set function

(ON is effective). 1 and 4 keep for future function. 2 is for

configuration mode settings. 3 is recovery default factory. Please

power off and power on when you change the status of DIP

switch.

- 2 -

【Communication connector】

CAN-Bus interface

NO.

Name

Define

GND

Protective Ground

CANL

CANL Signal Line

CANH

CANH Signal Line

RES+

External Terminal Resistor (+)

RES-

External Terminal Resistor (-)

CAN terminals

While CAN232 device connects with the CAN-Bus network via

twisted pair, CANL connects with CANL, CANH connects with

CANH. According to the ISO11898 standard, to reduce signal

reflections on the CAN-Bus and enhance the reliability of

communication, terminal matching resistor is usually added to 2

endpoints of the bus. The size of terminal matching resistor is

decided by the characteristic impedance of cable transmission,

such as twisted pair's characteristic impedance is 120Ω, the 2

endpoints on the bus should be connected 120Ω terminating

resistor. CAN232 can set external terminating resistor, when the

device is connected with the CAN-Bus network via a twisted pair,

only use resistor to short circuit between the twisted pair ports

RES+ and RES- to achieve terminal resistor accession, as shown

below.