USB RS485
RS485 Signal Con v erter
AX7241 Manual
DOTECH, INC | 6F, JOONG-INBO B/D, 778 WONSI-DONG, DANWON-GU, ANSAN-SI,
GYEONGGI-DO, KOREA (425-8526층)
TEL : +82-31-495-3767 FAX : +82-31-495-3917
http://www.dotech21.com bussiness@dotech21.com
USB RS485 | RS485 Signal Converter AX7241 Manual
USB to RS485 Converter AX7241
Accessories
- AX7241(1EA)
- DeviceDRV CD(1EA)
- USB extension cable : 1.2 m (1EA)
- 3 Pin connector (1EA)
- User manual (1EA)
Product Terminal Description
- T erminal Description
TRX- : RS485 Negative Signal (The same signal with other products B, -)
TRX+ : RS485 Positive Signal (The same signal with other products A, -)
- The efficiency of termination resistance
In the case of terminating resistance, binding internal RS485 by 120 ohms, can get effect about
efficiency of external noise and signal transduction.
Thus, if 1:1, Host and Client-ended are better to process termination, if 1:N, it is better to
process termination only for Host and end Client module.
Appearance
Feature
- USB A to Mini A 5Pin
- USB to RS485 duplex converter of virtual Com type
- Built in surge protector
- No need a control signal as a Tx-Enable (No need to control using RTS, CTS, DTR, DTE)
- Stable data transmission just by TXD, RXD, GND signal (1200~1M BPS)
- It is possible to check current communication conditions through Status LED, TXD, RXD
01
66mm
65mm
18mm
37mm
termination resistance termination resistance
Unit #1
Unit #2 Unit #3 Unit #N
It can be weak on noise
HOST RS485
Client RS485
Client RS485
Client RS485
Client RS485
It can be weak on noise
- Illustration of terminating resistance processing
No Good method : termination resistors processing in the middle of line
- Proper wiring of RS485 line
* Tip
Line connection method that branches line from No.1 starting from Master, to No.2 Client
starting from Master, and connect to No.3 Client branching again from No.2 is good for
noise and improving flowing status of signal. Otherwise, method that all Clients are
branched from Host may scatter the following situation of signal and it is no good for
debugging in some cases when produced problem.
termination resistance
termination resistance
Good method : termination resistors processing at both each end of line
Unit #1
Unit #2 Unit #3 Unit #N
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USB RS485 | RS485 Signal Converter AX7241 Manual
How to use products
1. Connect AX7241 model to PC using USB cable.
2. If new hardware device is searched, install Device Driver of DeviceDRV folder in CD.
3. Connect green connector terminal of AX7241 to communication card of Client
RS485 device between the same signals.
(For example TRX + ↔ TRX +, TRX- ↔ TRX-)
4. Windows start > Control Panel > System > Hardware > Device Manager >
Ports and LPT should check the virtual serial port.
5. Use setting Serial COM port that get caught virtually at Client terminal.
HOST PC
RS485
Client RS485
USB
AX7241
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USB RS485 | RS485 Signal Converter AX7241 Manual
Product installation
- Connect AX7241 model to PC using USB cable before install driver.
※ Automatic installation
- Click the Cancel button.
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USB RS485 | RS485 Signal Converter AX7241 Manual
- Execute CP210x_VCP_Win_XP_S2K3_Vista_7.exe in provided CD.
- Click Next > Button.
- After select I accept ...click Next > button.
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USB RS485 | RS485 Signal Converter AX7241 Manual
- Can specify the installation location. Or Next > click button.
- Click Install Button.
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USB RS485 | RS485 Signal Converter AX7241 Manual
- Click the OK button.
- Click Finish Button.
- Can change the location. Or, click the Install button.
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USB RS485 | RS485 Signal Converter AX7241 Manual
- When properly installed, It is available to confirm at Device Manager, Port (COM & LPT).
My Computer > right-click > Properties > Hardware > Device Manager or
Windows start > Control Panel > System > Hardware > Device Manager > Ports and LPT
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USB RS485 | RS485 Signal Converter AX7241 Manual
USB RS485 | RS485 Signal Converter AX7241 Manual
3. Start in Windows > Programs > Accessories > Communications >
Hyper Terminal select.
4. When Pops up the New Connection Window, input the proper name,
then click the OK button.
5. Select the virtual COM identified in Device Manager of Connection object window.
TRX+
TRX-
TRX+
TRX-
How to TEST products
※ If it is AX7241 (needed 2 units of AX7241 product)
1. Connect between TRX + ↔ TRX +, TRX- ↔ TRX- for RS485 terminal of green
connector end of product.
2. Connect USB terminal to PC.
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USB RS485 | RS485 Signal Converter AX7241 Manual
6. After setting the Properties window as shown below, then click the OK button.
7. Practical communications terminal window is generated, and check the connection
status under the status Window. Note ; if use PC COM No.5, 6, must make by
selecting respectively No.5, 6 at connection target window.
8. So, when come up 2 windows , put the character in hyper terminal window and
verify characters transferred on the other Hyper Terminal window.
Check connection target
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