Casio IT-10M20 Hardware Manual page 19

Pin layout for Serial Interface;
1 2 3 ・ ・ ・
Signal layout;
Table 2.2
Pin
Signal
no.
1 CR CD2#
2 RS232C CS
3 RS232C CD
4 RS232C ER
5 RS232C RS
6 RS232C DR
7 GND
8 USB Client D-
9 USB Client D+
10 USB Client PLU For USB power
11 USB Host D-
12 USB Host D+
13 VBUS
14 ADP
15 ADP
16 ADP
17 ADP
18 RS232C RXD
19 RS232C TXD
20 GND
21 GND
22 CRSEL0
23 CRSEL1
24 ADP
25 ADP
26 CR CD1#
Notes:
• Since the current at a peak level that flows through the interface reaches as high as 3A, all the "ADP" and
"GND" pins in the table must be used.
• Metal frame of the connector must be connected to "GND" pins.
Fig. 2.1
Use
#2 for detecting the Cradle
RS232C
RS232C
RS232C
RS232C
RS232C
GND
For USB Client
For USB Client
For USB Host
For USB Host
For USB power
Power for charging battery on the terminal
Power for charging battery on the terminal
Power for charging battery on the terminal
Power for charging battery on the terminal
RS232C
RS232C
-
-
For recognition of connected device
For recognition of connected device
Power for charging battery on the terminal
Power for charging battery on the terminal
#1 for detecting Cradle
19
・ ・ ・ 24 25 26
Direction of
signal flow
IN
IN
IN
OUT
OUT
IN
-
IN/OUT
IN/OUT
IN
IN/OUT
IN/OUT
OUT
-
-
-
-
IN
OUT
-
-
IN
IN
-
-
IN
Remark
See note.
See note.
See note.
See note.
See note.
See note.
See note.
See note.
See note.