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UM0193 Datasheet(PDF) 5 Page - STMicroelectronics

Part # UM0193
Description  Getting Started with the ARMIC30 Evaluation Board
PDF  35 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0193 Datasheet(HTML) 5 Page - STMicroelectronics

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UM0193
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1.2
RS-485 interface
The ST485A Transceiver ensures RS-485 communication through the UART1 serial
channel of the STR730F microcontroller as shown in Figure 5.
The maximum speed of this interface is greater than 30 Mbps.
A female, 9-pin D-Sub connector (J12) provides the RS-485 connection using a standard
Profibus pinout.
The RS-485 channel can be terminated using jumpers J10 and J13 as described in
Appendix C: Jumper settings. Terminating resistors R25, R26 and R28 are selected for a
Type-A Profibus DP cable as shown in Figure 5. These resistors can be replaced with
different values depending on the physical layer implemented.
Figure 5.
RS-485 schematic diagram
Table 2.
RS-485 Connections
J12 Pin
Signal
STR730F MCU
Peripheral
RxD (Receive Data)
Port 2.9
UART1
TxD (Transmit Data)
Port 2.8
UART1
DE (Driver Enable)
Port 2.10
UART1
5GND
1, 2, 4, 7 and 9
Not connected
Shielding
Connected to GND by R31 || C26 (100 k
Ω || 4.7 nF)
Ai11694
5V
5V
5V
5V
TxD485
RxD485
nDE485
R26 220R
NA
R2 220R
NA
R30 0R
R30 0R
1
2
J10
J10
R28
390R
NA
R28
390R
NA
1
2
J13
J13
R29 0R
R29 0R
J11
J11
R27
390R
R27
390R
1
2
3
4
5
6
7
8
9
M1
M2
J12
J12
RO
1
DI
4
GND 5
VCC 8
RE
2
DE
3
A 6
B 7
U4
ST485A
4
ST485A
R31 M1
R31 M1
C25
100n
C25
100n
R25
390R
NA
R25
390R
NA
C26
4n7/500V
C26
4n7/500V
DSUB9 - Socket



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