136
Extending Transmission over the Distance
The transmission signals between the RS-485 communications become weak over the
distance. To maintain the signals, switch on the Terminal Resistance Switch to reduce the
resistance value. The loger the distance, the smaller the resistance value (
Ω
) should be
switched on.
Terminal Resistance Switch
1. TR-A, TR-B, TR-C and TR-D is the Terminal Resistance Switch for
RS485-A, RS-485-B, RS-485-C, and RS-485D respectively.
2. Followings are the address assignments of the Terminal Resistance
Switch.
Switch No. Resistance Value
(
Ω
)
Switch No.
Resistance Value
(
Ω
)
0
∞
4
30
Ω
1 120
Ω
5
24
Ω
2 60
Ω
6
20
Ω
3 40
Ω
7
17.14
Ω
Installing Drivers
When you connect the GV-Hub V2 to the computer, the Found New Hardware Wizard will
automatically detect the device. To install the drive, follow the steps described in
2.13
Installing USB Driver
.
To verify the drivers are installed correctly, go to
Device Manager
. Expanding the
Ports
field,
you should see the 4 entries for
Prolific USB-to Serial Bridge
.
Figure 2-24
