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CP6940 User Guide
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3.4.5.4
J4 Connector
•
RS232 Interface (RX/TX)
The J4 connector provides the rear RS232 interface and the Firmware Write Protect Disable signal. The CP6940 distrib-
utes a 5V power supply rail to the RTM via J4. A 4A fuse protects the board from overcurrent or short circuit.
Table 11:
Connector J4 Pinout
Pin
Row A
Row B
Row C
Row D
Row E
Row F
25
FL20_DA-
GND
FL20_DC-
GND
24
FL20_DB-
GND
FL20_DD-
GND
23
FL21_DA-
GND
FL21_DC-
GND
22
FL21_DB-
GND
FL21_DD-
GND
21
FL22_DA-
GND
FL22_DC-
GND
20
FL22_DB-
GND
FL22_DD-
GND
19
FL23_DA-
GND
FL23_DC-
GND
18
FL23_DB-
GND
FL23_DD-
GND
17
NC
NC
NC
NC
GND
16
NC
NC
NC
NC
GND
15
NC
NC
NC
NC
GND
14
Key Area / ocher-yellow peg (ID: 36215)
13
12
11
NC
NC
NC
NC
NC
GND
10
NC
NC
NC
NC
NC
GND
9
FWPD_J4#
NC
GND
RTM_TXD#
RTM_RXD#
GND
8
NC
NC
NC
NC
NC
GND
7
NC
NC
NC
NC
NC
GND
6
NC
NC
NC
NC
NC
GND
5
NC
NC
NC
NC
NC
GND
4
NC
NC
NC
NC
NC
GND
3
NC
NC
NC
NC
NC
GND
2
NC
NC
NC
NC
NC
GND
1
V_5V_HS_RT-
M_F
V_5V_HS_RT-
M_F
NC
V_5V_HS_RT-
M_F
V_5V_HS_RT-
M_F
GND
