RS-USBX user manual - 2009/03/16
SP09002
Page 10 of 12
4 HARDWARE
4.1 VOLTAGE SUPPLY
Voltage supply is fed to RS-USBX from the PC through the USB port.
4.2 CONNECTORS
RS-USBX is equipped with a 9-pole female D-SUB connector for connection to serial line network and with a
B-type USB socket for connection to PC.
4.2.1 Serial connector
Pin
Signal
1
120 Ω
(1)
2
TXD (TTL)
3
A/TX+ (485/422)
4
RX- (422)
5
GND
6
RXD (TTL)
7
B/TX- (485/422)
8
RX+ (422)
9
120 Ω
(1)
(1) The termination on a RS485 line will be obtained by connecting the pins 1 and 4.
The termination on a RS422 line will be obtained by connecting the pins 1 and 4 (RX) plus the pins 9
and 7 (TX)
4.3 LEDS
There is three led at right side of the serial line connector, showing the status of RS-USBX:
LED 1
(yellow)
LED 2
(yellow)
LED 3
(green)
Description
OFF
OFF
OFF
Interface not powered
OFF
OFF
ON
Interface connected to USB port, waiting for the connection with an
application program.
Blink
Blink
ON
Interface connected with an application program. LED2 monitors the RX/
TX activity over the serial line.
ON
Blink
ON
Firmware update running
Table 4-1 LEDs