THEMIS
THEMIS User Manual - Rev. First Edition: 1.0 - Last Edition: 2.2 - Author: A.R. - Reviewed by S.R. -Copyright © 2022 SECO S.p.A.
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Expansion connectors
THEMIS board offers multiple interfaces, like RS-232, RS-485, SPI, I2C and so on, which are carried to three expansion connectors.
First expansion connector is CN49, an 8-pin single line SMT connector, type MOLEX 53398-0871 or
equivalent, with pinout shown in the table on the left. Mating connector: MOLEX 51021-0800
receptacle with MOLEX 50079-8000 female crimp terminals. This connector carries out processor
’
s UART #1 (4-wires
UART) and UART#2 interface (2-wires UART). UART #1 interface can be optionally (factory alternatives) available in RS-
232 or TTL interface, while UART #2 interface is always available in TTL interface. Pins available with TTL interface can
also be used also as GPIO.
RS232_UART1_TX: Serial Port#3 Transmit data; can be available at RS232 or TTL level (factory alternatives)
RS232_UART1_RX: Serial Port#3 Receive data; can be available at RS232 or TTL level (factory alternatives)
RS232_UART1_RTS: Serial Port#3 Request to Send handshaking signal; can be available at RS232 or TTL level (factory
alternatives)
RS232_UART1_CTS: Serial Port#3 Clear to Send handshaking signal; can be available at RS232 or TTL level (factory
alternatives)
TTL_GPIO_UART2_TX: GPIO or Serial Port#2 Transmit data (TTL level)
TTL_GPIO_UART2_RX: GPIO or Serial Port#2 Receive data (TTL level)
Second expansion connector is CN50, a 10-pin single line SMT connector, type MOLEX 53398-
1071 or equivalent, with pinout shown in the table on the left. Mating connector: MOLEX 51021-
1000 receptacle with MOLEX 50079-8000 female crimp terminals.
This connector carries out processor
’
s UART #4 (4-wires UART) interface, M41 core
’
s I2C interface
and two GPIOs.
UART #4 interface can be optionally (factory alternatives) available in RS-485 or TTL interface.
Pins available with TTL interface can also be used also as GPIO.
UART4_TX_485_Y / UART4_RX_485_Z: Serial Port#4; can be RS485 differential pairs, RS422 transmit pair or TTL tx/rx
pair (factory alternatives)
UART4_RX_485_Z: Serial Port#4 Receive data; can be available at RS485 or TTL level (factory alternatives)
RS485_A / RS485_B: RS485 differential pairs or RS422 transmit pair (factory alternatives)
M41_I2C0_SDA: M41 core
’
s I2C Bus data line. Bidirectional signal, electrical level +3.3V_RUN with a 2k2
Ω
pull-up
resistor.
Expansion Connector #1 CN49
Pin Signal
1
+3.3V_RUN
2
GND
3
TTL_GPIO_UART2_TX
4
TTL_GPIO_UART2_RX
5
RS232_UART2_TX
6
RS232_UART3_RX
7
RS232_UART3_RTS
8
RS232_UART3_CTS
Expansion Connector #2 CN50
Pin Signal
1
+3.3V_RUN
2
UART4_TX_485_Y
3
UART4_RX_485_Z
4
RS485_A
5
RS485_B
6
GND
7
M41_I2C0_SDA
8
M41_I2C0_SCL
9
GPIO_0
10
GPIO_1
