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Tech Info - Ericsson Cables
Ericsson
218/318/337/388 Programming Cables This is one way of programming the
Ericsson. This cable designed by Anthony draws it's power for the PC serial
port not the phone like my design. It uses the MAX 232 IC RS232 to TTL converter.
The capacitors specified are all Tantalum 16V but if size is no consideration
use standard PC mount Caps. I prefer to use the 35v ones as they're readily
available. RS232 to TTL converter IC's MAX 203
DIP
MAX 203
Surface Mount
MAX 232
DIP
+5 Volt input
|
_____|7_____
--| |--
| 2-----conv-->--5 |
TTL IN | | | | RS-232 out
| 1-----conv-->--18|
--| |--
| |
--| |--
| 3--<--conv-----4 |
TTL OUT| | | | RS-232 in
|20--<--conv-----19|
--| |--
| |
12 __| |__ 11
| | | |
17|__| |__|15
| |
| |__ 16
| | |
| |__|10
|____________|
6| |9
|______|
|
GROUND
+5 Volt input
|
_____|7_____
--| |--
| 2-----conv-->--5 |
TTL IN | | | | RS-232 out
| 1-----conv-->--18|
--| |--
| |
--| |--
| 3--<--conv-----4 |
TTL OUT| | | | RS-232 in
|20--<--conv-----19|
--| |--
| |
10 __| |__ 12
| | | |
17|__| |__|15
| |
| |__ 16
| | |
| |__|11
|____________|
6| |9
|______|
|
GROUND
+5 Volt input
|-----)|----|-----)|-----|
gnd + | + |
_____|16____ |
|-)|--1-| |_2___|
| + | |
|_____3_| |-6-)|--|
| | + |
|-)|--4-| | |
| + | | gnd
|-----5-| |
| |
--| |
|11-----conv-->--14 |
TTL IN | | | | RS-232 out
|10-----conv-->--7 |
--| |--
| |
--| |--
|12--<--conv-----13 |
TTL OUT| | | | RS-232 in
| 9--<--conv-----8 |
--| |--
|____________|
| 15
GROUND
Capcitors are marked by -)|-. + is
the | side. Caps are all 10 micro
pharad. 16V ok but 35V is best.