USB转RS232、TTL 二合一线改装成功

redming16

从淘宝15元购得一个APC USB转串口成品线，但拿到手后发现根本不能用，于拆开封装，最后改成了usb转RS232、TTL 二合一的转接线，如果大家有兴趣，我贴出改装过程。

kmper

贴一下吧

oywl43210

usb转ttl的线本来就是先转成rs232再转成ttl的吧，直接引出rs232不就行了吗？

zwgdin

帖吧

晨星

贴出来。。。急啊。。我的电脑没有并口 需要USB 接口

webpad

原帖由 oywl43210 于 2008-5-2 16:32 发表
usb转ttl的线本来就是先转成rs232再转成ttl的吧，直接引出rs232不就行了吗？

错误
应该是：
USB信号--->PL2303---->TTL信号---->MAX232 或者简单三极管电路------->RS232信号

webpad

楼主贴出改造图吧

yy5409

看看，请贴出来吧！！！

zero07

去查查IC就知了
PL2303  (USB转TTL)
MAX232 (TTL转RS323)

redming16

6楼说的对 ，USB信号--->L2303---->TTL信号---->MAX232 或者简单三极管电路------->RS232信号
但我的这个不MAX232，是ZT213LEEA，作用与MAX232相同，可转四路RS232信号，但只用了一路，
从淘宝买的这个电路部份是塑封的，很小心用钢片刀切开。

PL-2303 的 1、5就是TTL信号的输入输出，我是从芯片1 、5 脚引出来，再加GND线 接到RJ45头的 5、7、8脚，
无线路由是WR850G V2，把其中一LAN口座的578脚相连的铜薄切断，把路由器的TTL 的 TX、RX 、GND用线焊
到578脚上，与上面RJ45头的接线对应，就可方便 的连接了。

这个ZT213最后在焊时不小心把其相连的铜薄 焊了脱离基板 断了，线很细找不到连到那了，现在RS232 也不成了

我这个TTL  GND 和RS232 GND 不是连一起的 是分开的，不能混用。

直接从PL-2303  的1、5脚 及其GND引出来不行话，还需要断开其到ZT213的连接。

如果只想用TTL 就把ZT213 之类的焊起了不要就行。

总之 市面上 大部份都是 PL-2303,改装很易的，就是 1、5脚。

redming16

我的WR850G V2 TTL开机启动信息
其中 Reading :: Failed.: Timeout occured  不知什么问题


CFE version 1.0.37 for BCM947XX (32bit,SP,LE)
Build Date: Tue Jan 13 14:34:16 CST 2004 (xavier@localhost.localdomain)
Copyright (C) 2000,2001,2002,2003 Broadcom Corporation.

Initializing Arena.
Initializing Devices.
et0: Broadcom BCM47xx 10/100 Mbps Ethernet Controller 3.50.21.0
CPU type 0x29007: 200MHz
Total memory: 0x2000000 bytes (32MB)

Total memory used by CFE:  0x8032BAD0 - 0x804313F0 (1071392)
Initialized Data:          0x8032BAD0 - 0x8032E040 (9584)
BSS Area:                  0x8032E040 - 0x8032F3F0 (5040)
Local Heap:                0x8032F3F0 - 0x8042F3F0 (1048576)
Stack Area:                0x8042F3F0 - 0x804313F0 (8192)
Text (code) segment:       0x80300000 - 0x80309510 (38160)
Boot area (physical):      0x00432000 - 0x00472000
Relocation Factor:         I:00000000 - D:00000000

Device eth0:  hwaddr 00-0C-E5-52-3D-31, ipaddr 192.168.10.1, mask 255.255.255.0
        gateway not set, nameserver not set

    *CFE for Motorola WR850G v2.03, Release date: Jan. 13, 2004

Reading :: Failed.: Timeout occured
Loader:raw Filesys:raw Dev:flash0.os File: Optionsnull)
Loading: ............ 1564672 bytes read
Entry at 0x80001000
Closing network.
Starting program at 0x80001000
CPU revision is: 00029007
Primary instruction cache 8kb, linesize 16 bytes (2 ways)
Primary data cache 4kb, linesize 16 bytes (2 ways)
Linux version 2.4.20 (root@x31fc) (gcc version 3.2.3 with Broadcom modifications) #7 Sun Apr 27 16:58:13 CST 2008
Setting the PFC value as 0x15
Determined physical RAM map:
memory: 02000000 @ 00000000 (usable)
On node 0 totalpages: 8192
zone(0): 8192 pages.
zone(1): 0 pages.
zone(2): 0 pages.
Kernel command line: root=/dev/mtdblock2 noinitrd console=ttyS0,115200
CPU: BCM4712 rev 1 at 200 MHz
Calibrating delay loop... 199.47 BogoMIPS
Memory: 30672k/32768k available (1337k kernel code, 2096k reserved, 108k data, 64k init, 0k highmem)
Dentry cache hash table entries: 4096 (order: 3, 32768 bytes)
Inode cache hash table entries: 2048 (order: 2, 16384 bytes)
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
Buffer-cache hash table entries: 1024 (order: 0, 4096 bytes)
Page-cache hash table entries: 8192 (order: 3, 32768 bytes)
Checking for 'wait' instruction...  unavailable.
POSIX conformance testing by UNIFIX
PCI: Disabled
PCI: Fixing up bus 0
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
Starting kswapd
devfs: v1.12c (20020818) Richard Gooch (rgooch@atnf.csiro.au)
devfs: boot_options: 0x1
squashfs: version 3.0 (2006/03/15) Phillip Lougher
pty: 256 Unix98 ptys configured
Serial driver version 5.05c (2001-07-08) with MANY_PORTS SHARE_IRQ SERIAL_PCI enabled
ttyS00 at 0xb8000300 (irq = 3) is a 16550A
ttyS01 at 0xb8000400 (irq = 0) is a 16550A
HDLC line discipline: version $Revision: 1.1.1.4 $, maxframe=4096
N_HDLC line discipline registered.
PPP generic driver version 2.4.2
Flash device: 0x400000 at 0x1c000000
Creating 5 MTD partitions on "hysically mapped flash":
0x00000000-0x00040000 : "pmon"
0x00040000-0x003e0000 : "linux"
0x000e2cf4-0x00300000 : "rootfs"
0x00300000-0x003e0000 : "jffs2"
0x003e0000-0x00400000 : "nvram"
sflash: found no supported devices
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
IP: routing cache hash table of 32768 buckets, 256Kbytes
TCP: Hash tables configured (established 2048 bind 4096)
Linux IP multicast router 0.06 plus PIM-SM
ip_conntrack version 2.1 (16384 buckets, 8192 max) - 368 bytes per conntrack
ip_tables: (C) 2000-2002 Netfilter core team
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
NET4: Ethernet Bridge 008 for NET4.0
802.1Q VLAN Support v1.7 Ben Greear <greearb@candelatech.com>
All bugs added by David S. Miller <davem@redhat.com>
VFS: Mounted root (squashfs filesystem) readonly.
Mounted devfs on /dev
Freeing unused kernel memory: 64k freed


Hit ENTER for console...

Algorithmics/MIPS FPU Emulator v1.5
No change was necessary.
eth2: No such device
eth3: No such device
lo: File exists
vlan1: No such process



Tomato 1.19.0005



BusyBox v1.2.2 (2008.04.21-16:46+0000) Built-in shell (ash)
Enter 'help' for a list of built-in commands.

#

webpad

  好图 好解释， 收藏了

n225

看到有卖串口转usb的线，改了可以实现jtag功能吗？看见产品说明上说支持DB25

netreg

楼主的内存容量改成32MB了？

kingtyj

标记一下，也有一根很久的这样的线，一直不会改