[Gta04-owner] Error in pin layout of serial cable?
jensseidel at users.sf.net
Mon Dec 5 01:30:57 CET 2011
I received my new board a few days ago and think I found an error in
the pin location of the serial cable. Pins 7 and 8 have to be swapped
in the table in the manual (so that this matches the picture of the
cable adapter at page 36):
According to page 35 of the PDF manual
"Pin location and signals:
Pin DCE pin UART3 GPIO Dir. Color (in our presoldered cable) DB9f pin
name (mode0) (mode4) number
1 GND - - - brown 5
2 EXT - 21 Out red 1 (DCD)
3 CTS RTS 164 Out orange 7
4 TX RX 166 In yellow 3
5 RTS CTS 163 In green 8
6 RX TX 165 Out blue 2
7 GND - - - purple -
8 DCIN - - In grey -
7, 8 = orange, green = CTS, RTS
This seems to contradict with e.g.
RS232 DB-9 Connector Pin Out Pin # Signal Name Signal Description
1 CD Carrier Detect
2 RXD Receive Data
3 TXD Transmit Data
4 DTR Data Terminal Ready
5 GND Signal Ground / Common
6 DSR Data Set Ready
7 RTS Request To Send
8 CTS Clear To Send
9 RI Ring Indicator
With the fixed layout I did not yet receive any output but maybe I did
something wrong :-)
The display backlight is on (it doesn't turn off for a short time),
now I disconnected it again. No change.
Found also some minor issues in the makesd script, which I will report
separately. Maybe my sd card doesn't contain a bootable system.
A remark to the replacing instruction (page 24):
"4.5. Glueing the Touch&LCD module onto the GTA04 PCB
1. Peel off the plastic cover on the double-sided tape of the GTA04 PCB."
Huh? Is there a double-sided tape on the new motherboard? I haven't
seen it and glued the display with double-sided transparent tesa
strip. Probably not the best solution but did I miss something?
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