General Purpose IO (GPIO)
GPIO signals are housed in a 20-pin box connector, GPIO1 and
GPIO2. Each of the connector includes 16 channels of GPIO. The
pin definition is as shown following:
The signal level of GPIO is CMOS level and pitch of the pin header
is 2.54 mm. Each of the DIO pin can be programmed as digital input
or digital output.
CN1 JTAG Header
JTAG header is located near power connector and it is a 2x4 2.0 mm
pin header and the pin definition is shown as follow:
COM2 TTL Header
COM2 TTL is a CMOS/TTL signal pin connector and it is
connected to UART of port 2 and its definition is as shown
below
This connector allows user to design an internal Modem to work
with M-508.
JP2 Boot manager selection
JP2 is boot selection jumper near CN1. Set to position 2-3
always. Change the setting will cause incorrectly boot up.
USB Client connector (J3)
USB client port is reserved for future enhancement. This
function is disabled by software.
Pin definition is as follow:
1.
Data
+
2. Data -
3.
Host_detect
4.
GND
RS-485 terminator jumper (J5,J7,J8,J9)
Short the jumper will enable the 120 ohm terminator as shown
below
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
DI0
DI2
DI4
DI6
DI8
DI10
DI12
DI14
GND
+5V
DI1
DI3
DI5
DI7
DI9
DI11
DI13
DI15
GND
+3.3V
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
DI16
DI18
DI20
DI22
DI24
DI26
DI28
DI30
GND
+5V
DI17
DI19
DI21
DI23
DI25
DI27
DI29
DI31
GND
+3.3V
GPIO1
GPIO2
2 4 6 8
1 3 5 7
JTAG
Definition
6
5
4
3
2
1
GND
+5VDC
RTS
TXD
CTS
RXD
3 2 1
1 2 3 4
