Vscom Usb-Com Pro; Serial Port Hardware Options; Features Of Vscom Usb-Com Pro Single Port - VSCOM USB-COM PRO User Manual

2 Introduction
possible to receive the data while they are sent out of the port. This option is named Echo, and it
can be deselected.
The transmitter for Tx lines in RS485 mode may be controlled by the application via RTS signal,
as well as by an internal automatic hardware circuitry.
Option
BIAS
TxTerm
RxTerm
The modes of RS422 and RS485 allow to configure BIASing of the data lines, as well as connecting
120Ω termination resistors between the positive and negative wire. These three options can be
selected per port, they are disabled if the port is in RS232 mode.

2.2.1 VScom USB-COM PRO

Serial Ports
Connectors
Power
FIFO size
LED
Table 3: Features of VScom USB-COM PRO Single Port
June 2009
Result
Polarize Tx+/Rx+ to +5V, Tx /Rx
120Ω resistor from Tx+ to Tx
120Ω resistor from Rx+ to Rx
Figure 1: Serial Port Hardware Options
Figure 2: VScom USB-COM PRO
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1 DB9 male RS232, RS422, RS485 (6.1)
1 Terminal block RS422, RS485 (6.3)
Bus powered
128 Bytes Transmit
256 Bytes Receive
Power On Top: Red LED
2 Data On Top: Transmit Green, Receive Yellow
1 Mode On Top: 3-Color
USB-COM PRO User Manual
to GND
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