PD-1141 Hardware Manual (Rev. 1.04 / 2013-JUL-23)
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3.3.5
Mini-USB Connector
A 5pin mini-USB connector is available on-board for serial communication (as alternative to the RS485
interface). This module supports USB 2.0 Full-Speed (12Mbit/s) connections.
1
5
Pin
Label
Direction
Description
1
VBUS
Power
(supply input)
+5V supply from host
2
D-
Bidirectional
USB Data –
3
D+
Bidirectional
USB Data +
4
ID
Power (GND)
Connected to signal and system ground
5
GND
Power (GND)
Connected to signal and system ground
Table 3.6 Connector for USB
For remote control and communication with a host system the PD-1141 provides a USB 2.0 full-speed
(12Mbit/s) interface (mini-USB connector). As soon as a USB host is connected the module will accept
commands via USB.
USB
B
US
P
OWERED
O
PERATION
M
ODE
The PD-1141 supports both, USB self powered operation (when an external power is supplied via the
power supply connector) and USB bus powered operation, (no external power supply via power supply
connector).
On-board digital core logic will be powered via USB in case no other supply is connected (USB bus
powered operation). The digital core logic comprehends the microcontroller itself and also the EEPROM.
The
USB bus powered operation mode
has been implemented to enable configuration, parameter
settings, read-outs, firmware updates, etc. by just connecting an USB cable between module and host PC.
No additional cabling or external devices (e.g. power supply) are required.
Please note that the module might draw current from the USB +5V bus supply even in USB self powered
operation depending on the voltage level of this supply.
Motor movements are not possible in this operation mode. Therefore, connect the power connector and
change to
USB self powered operation mode
.
