Aviom DB9 connector, pin 3 (RS‑232 –Tx) will drive pins 1 and 6 at the other
end of the cable through the 100 ohm resistor. This isn’t a problem for most
modern RS‑232 implementations as these signals are ignored, and both are
inputs.
Although there is no standard DB9 pinout for RS‑422, the 6416Y2 requires
that a straight‑through cable be used between the Aviom and Yamaha
RS‑422 ports. An example of this type of cable is the L‑Com CRMN9FF‑X
(where X = cable length).
If a problem is encountered with the RS‑232 operation, there are two things
that can be done:
Try another brand of null modem cable.
1.
Cut the wire in the cable going to pin 4. It isn’t needed for
2.
RS‑232 operation.
P
N
ote
The Aviom RS‑232 port does not support the CD, DTR, DSR, RTS,
CTS, or RI signals.
The following table showing the connections for a null modem DB9‑to‑DB9
crossover cable can be used when making your own cable.
Null Modem Cable Wiring for a DB9‑to‑DB9 Crossover Cable
Pin
Signal Direction
Pin
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
Shield Soldered to DB9 Metal on Both Connectors
85
s
PeCifiCations
