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rs232ttl.doc
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1989-07-24
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3KB
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67 lines
By Rich Bono, NM1D for AutoLog.
Here is a simple schematic of a RS-232 to ICOM CI-V adapter that
you can build yourself. If you do not want to build your own, ICOM sells
an accessory that does this for about $90.00.
1N4001 +-------+
+12 ------------|>|----+----+-----| 78L05 |-----+--------+
| + | in +-------+ out | |
Gnd ---+ --- --- |gnd | + |
| 22 uf --- --- .05uf | --- 22uf |
| 16 v | | ---- --- 16v |
---- | | / / / | |
/ / / ---- ---- | |
/ / / / / / ---- |
/ / / |
|
|
|
22uf + 1 +--------+16 |
+-----| |-------| MAX232 |----------------+
| + 2 | |15
+---+-- | ----| |-------| |-------------------------+
| | | 22uf 3 | |14 |
---- | +---------------| |----- ----
/ / / | + 4 | |13 / / /
| +---| |-------| |-----
| | 22uf 5 | |12
| +-------------| |-----
| 22uf + 6 | |11
+---------| |-------| |-----
7 | |10
3 ----------------------------| |--------+ To Remote
8 | |9 | Jack (CI-V)
2 ----------------------------| |--------+--------------> (Tip)
+--------+
4 ----+ +------> (Ring)
| |
5 ----+ ----
/ / /
6 ----+
|
7 ------------+
| |
8 ----+ ----
| / / /
20 ----+
DB-25 (Female RS-232 connector)
Parts list:
qty Description
1 MAXIM MAX-232 (RS-232 to TTL level converter)
1 78L05 (low power 5 volt regulator
1 1N4001 (diode)
6 22 uf at 16V capacitors
1 .05uf at 16V
1 DB-25 (Female RS-232 connector)
1 Mini phone plug (to connect to ICOM Remote jack)
Please pardon the crude schematic!