Colibri Carrier Board Design Guide
Toradex AG l Altsagenstrasse 5 l 6048 Horw l Switzerland l +41 41 500 48 00 l www.toradex.com l info@toradex.com
2.10.2 Reference Schematics
2.10.2.1 Full-Featured RS232 Reference Schematics
The RS232 interface can be classified as Data Terminal Equipment (DTE) or Data Communication
Equipment (DCE). This classification is inherited from the usage of the interface for modems. The
signal direction of these modes is different. Some Colibri modules might allow changing the mode
and the data direction, but this is not a mandatory requirement. According to the Colibri
specifications, the interface is intended to be used in the DTE configuration.
DTE Direction
(Colibri standard)
DTE request to DCE be prepared to receive
data
DCE indicates ready to accept data
DTE indicates presence to DCE
DCE is ready to receive commands or data
DCE announce to have detected an incoming
ring signal on the telephone line
DCE announce to be connected to the
telephone line
Table 16: RS232 Signal Modes
Figure 17: RS232 Reference Schematic
2.10.2.2 RS422 Reference Schematics
The RS422 is a full-duplex serial interface with differential pair signals. This allows higher data
rates and longer distances as with the RS232. Since the RS422 has separate RX and TX signal pairs,
no additional control signals are required for changing the signal direction. This means the RS422
requires only the RX and TX signals of the UART interface. Therefore, it is possible to use any of the
three standard UART interfaces of the Colibri standard.
The RS422 specification does not contain a connector. Therefore, there is no standard connector
for this interface available. The reference schematic below uses the 9 pin D-sub connector (DE-9).
Peripherals might have a different pinout even if they use a DE-9 connector.
Figure 18: RS422 Reference Schematic
SN65C3243D BR
T3IN
12
T2IN
13
T1IN
14
R2 OUTB
20
R1 OUT
19
R2 OUT
18
R3 OUT
17
R4 OUT
16
R5 OUT
15
FORC EOFF#
22
FORC EON
23
INVALID #
21
T1OUT
9
T2OUT
10
T3OUT
11
R1IN
4
R2IN
5
R3IN
6
R4IN
7
R5IN
8
IC7 A
178-009-613R571
L1
L2
L3
L4
L5
L6
L7
L8
L9
X28B
GND
UARTA_RS232_L_RTS
UARTA_RS232_L_TXD
UARTA_RS232_L_DTR
UARTA_RS232_L_DCD
UARTA_RS232_L_RI
UARTA_RS232_L_DSR
UARTA_RS232_L_RXD
UARTA_RS232_L_CTS
UARTA_RS232_L_RTS
UARTA_RS232_L_TXD
UARTA_RS232_L_DTR
UARTA_RS232_L_DCD
UARTA_RS232_L_RI
UARTA_RS232_L_DSR
UARTA_RS232_L_RXD
UARTA_RS232_L_CTS
UARTA_CTS
UARTA_DSR
UARTA_RI
UARTA_DCD
UARTA_DTR
UARTA_TXD
UARTA_RTS
3.3V
3.3V
UARTA_RXD
SN65C3243D BR
VCC
26
V+
27
C1+
28
C1 -
24
GND
25
V-
C2+
1
C2 -
IC7 B
GND
GND
100nF
16V
C48
C44
100nF
16V
100nF
16V
C51
100nF
16V
C45
100nF
16V
C4 9
3.3V
UART1_CTS
UART1_DSR
UART1_RI
UART1_DCD
UART1_DTR
UART1_TXD
UART1_RTS
UART1_RXD
1473005 -1
PIN_19 / UART_C_RXD
19
PIN_21 / UART_C_TXD
21
PIN_23 / UART_A_DT R
23
PIN_25 / UART_A_CTS
25
PIN_27 / UART_A_RTS
27
PIN_29 / UART_A _DSR
29
PIN_31 / UART_A _DCD
31
PIN_33 / UART_A _RXD
33
PIN_35 / UART_A _TXD
35
PIN_37 / UART_A_RI
37
PIN_32 / UART_B_CTS
32
PIN_34 / UART_B_RTS
34
PIN_36 / UART_B_R XD
36
PIN_38 / UART_B_TXD
38
Colibri - UART
10 of 16
X1J
SODIMM_23_S
SODIMM_25_S
SODIMM_27_S
SODIMM_29_S
SODIMM_31_S
SODIMM_33_S
SODIMM_35_S
SODIMM_37_S
22 RRA2A
22 RRA2B
22 RRA2C
22 RRA2D
22 RRA3A
22 RRA3B
22 RRA3C
22 RRA3D
3
2
ADM3491 ARZ
Rx+
12
Rx-
11
Tx-
10
Tx+
9
NC
1
RO
2
nR E
3
DE
4
DI
5
GND
6
GND
7
NC
8
VCC
13
VCC
14
IC4
DE
RE#
100nF
16 V
C4 1
GND
UARTC_RS 422_TXD+
UARTC_RS 422_TXD-
UARTC_RS 422_RXD-
UARTC_RS 422_RXD+
GND
UARTC_RS 422_RXD-
UARTC_RS 422_RXD+
UARTC_RS 422_TXD+
UARTC_RS 422_TXD-
R5 7
120 R
1
2
3
4
5
6
7
8
9
1734351-1
X55A
3.3V
22RRA14A
22RRA14B
3.3V
GND
UARTC_RX D
UARTC_TX D
GND1473005 -1
PIN_19 / UART_C_RX D
19
PIN_21 / UART_C_TX D
21
PIN_23 /UART_A _DTR
23
PIN_25 / UART_A _CTS
25
PIN_27 / UART_A _RTS
27
PIN_29 / UART_A _DSR
29
PIN_31 / UART_A _DCD
31
PIN_33 / UART_A _RXD
33
PIN_35 / UART_A _TXD
35
PIN_37 / UART_A _RI
37
PIN_32 / UART_B _CTS
32
PIN_34 / UART_B _RTS
34
PIN_36 / UART_B _RXD
36
PIN_38 / UART_B _TXD
38
Colibri - UART
10 of 16
X1J
SODIMM_19_S
SODIMM_21_S
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