TMCM-1141 Hardware Manual (Rev. 1.06 / 2015-JAN-09)
Slave
10
Slave
+5V
pull-up (680R)
termination
node node
n- 1
n
RS485+ / RS485A
RS485- / RS485B
termination
resistor
resistor
(120R)
(220R)
pull-down (680R)
GND
Figure 3.4: Bus lines with resistor (Bias) network on one side, only
Or add resistor (Bias) network at both ends of the bus (like Profibus™ termination):
Slave Slave
+5V
pull-up (390R)
termination
+5V
pull-up (390R)
termination
node node
n- 1
n
RS485+ / RS485A
RS485- / RS485B
resistor
(220R)
resistor
(220R)
pull-down (390R)
GND
pull-down (390R)
GND
Figure 3.5: Bus lines with resistor (Bias) network at both ends
3.2.2 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.
Direction
Power
(supply input)
Bidirectional
Bidirectional
Power (GND)
Power (GND)
Pin
Label
VBUS
Description
+5V supply from host
1
2
3
4
5
D-
D+
ID
GND
USB Data –
USB Data +
Connected to signal and system ground
Connected to signal and system ground
5
1
Table 3.3 Connector for USB
For remote control and communication with a host system the TMCM-1141 provides a USB 2.0 full-speed
(12Mbit/s) device interface (mini-USB connector). As soon as a USB host is connected the module will
accept commands via USB.
USB BUS POWERED OPERATION MODE
The TMCM-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).
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