MIKROE-419 mikroElektronika, MIKROE-419 Datasheet - Page 13

• Manufacturer Part Number: MIKROE-419
• Description: Development Boards & Kits - PIC / DSPIC BIGPIC6 DEVELOPMENT SYSTEM
• Manufacturer: mikroElektronika

Specifications of MIKROE-419

• Rohs: yes
• Product: Development Kits
• Core: PIC
• Interface Type: ICD, IDC10, JTAG, RS-232, USB
• Operating Supply Voltage: 9 V to 32 V
• Data Bus Width: 8 bit
• Description/function: Development Board Only, Touch Screen, Pencil, DS1820, LCD, Serial Cable, GLCD not included
• Dimensions: 265 mm x 220 mm
• For Use With: PIC

BigPIC6 Development System
BigPIC6 Development System
7.0. RS-232 Communication Interface
The USART (universal synchronous/asynchronous receiver/transmitter) is one of the most common ways of exchanging data
between the PC and peripheral components. RS-232 serial communication is performed through a 9-pin SUB-D connector and the
microcontroller USART module. The BigPIC6 provides two RS-232 ports, RS-232A and RS-232B. Use switches marked as RX232-A
and TX232-A on the DIP switch SW12 to enable RS-232A port. Likewise, use switches RX232-B and TX232-B on the DIP switch SW12
to enable RS-232B port. The microcontroller pins used in such communication are marked as follows: RX - receive data and TX -
transmit data. Baud rate goes up to 115 kbps.
In order to enable the USART module of the microcontroller to receive input signals with different voltage levels, it is necessary to
provide a voltage level converter such as MAX202C (MAX232).
The function of switches 1, 2, 3 and 4 on the DIP switch SW12 is to determine which of the microcontroller pins are to be used as RX
and TX lines, Figure 7-2.
Figure 7-2: RS-232 module schematic
NOTE:
Ports RS-232A and RS-232B are
connected to the microcontroller
VCC
RH2
RH3
RE1
RE0
RG0
RG1
RG2
RG3
MCLR
RG4
GND
VCC
RF7
RF6
RF5
RF4
RF3
RF2
RH7
RH6
Make sure that your microcontroller is provided with the USART module as it is not necessarily integrated in all PIC microcontrollers.
PIC18Fxx
VCC
VCC
OSC2
OSC1
GND
VCC
RB0
RB1
RB2
RB3
RB4
RB5
RB6
RB7
RC5
RC4
RC3
RC2
RJ2
RJ3
RJ7
RJ6
VCC
RS-232 connector
RC7
RC6
RG2
RG1
SW9
RX232-A
TX232-A
RX232-B
TX232-B
Figure 7-1: RS-232 module
C35
100nF
C36
100nF
C34
100nF
SUB-D 9p
Bottom view
5
9
9
MAX202
U4
RS 232
C1+
V+
C1-
C2+
C2-
V-
T2 OUT
R2 IN
5
-
R1 OUT
R2 OUT
T1 OUT
R1 IN
T1 IN
T2 IN
VCC
GND
A
1
6
6
1
VCC
C 7
100nF
CN12
3
R53
1K
VCC
C38
100nF
C39
100nF
C40
100nF
SUB-D 9p
Bottom view
5
9
9
MAX202
U5
RS 232
C1+
V+
C1-
C2+
C2-
V-
T2 OUT
R2 IN
5
-
R1 OUT
R2 OUT
MikroElektronika
T1 OUT
R1 IN
T1 IN
T2 IN
VCC
GND
B
1
6
6
1
VCC
C41
100nF
CN13
R54
1K
VCC
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