Anyone know Holley Commander 950's? programming?
Fast have you got the Holley downloads/ manuals?
Here and down towards the bottom of course
Tech Resources
I would download and save everything you can find, there
In here
https://documents.holley.com/techlibrary_r10149-7.pdf
page 110
This is "what I hope" your computer serial port pinout
What the bug here is that sometimes people don't specify which end is which. For example if you are trying to hook two computer serial ports together, you need a "null" or "null modem" cable. What this means is the TX (TD) on one end must hook to the RX on the OTHER end, and vice versa. That is, the computer port end TX is sending OUT data. If the Holley is properly specified, it's pinout that would hook to that mating TX would be specified RX.
Example, Bill said:
ECU pin, Function, Round_male, Round_female, DB9 (PC end), PC function
A12, Serial Gnd, 1, 1, 5, GND
A9, TxD, 2, 2, 2, Rx_Out
A8, RxD, 3, 3, 3, Tx_In
A2, ModA, 4, none,,
A3, ModB, 4, none,,
So example, look at A9 and look on the big Holley diagram I posted. It is marked "TXD" (transmit data) and it goes to pin 2 on the DB9 connector which is RXD
Fast have you got the Holley downloads/ manuals?
Here and down towards the bottom of course
Tech Resources
I would download and save everything you can find, there
In here
https://documents.holley.com/techlibrary_r10149-7.pdf
page 110
This is "what I hope" your computer serial port pinout
What the bug here is that sometimes people don't specify which end is which. For example if you are trying to hook two computer serial ports together, you need a "null" or "null modem" cable. What this means is the TX (TD) on one end must hook to the RX on the OTHER end, and vice versa. That is, the computer port end TX is sending OUT data. If the Holley is properly specified, it's pinout that would hook to that mating TX would be specified RX.
Example, Bill said:
ECU pin, Function, Round_male, Round_female, DB9 (PC end), PC function
A12, Serial Gnd, 1, 1, 5, GND
A9, TxD, 2, 2, 2, Rx_Out
A8, RxD, 3, 3, 3, Tx_In
A2, ModA, 4, none,,
A3, ModB, 4, none,,
So example, look at A9 and look on the big Holley diagram I posted. It is marked "TXD" (transmit data) and it goes to pin 2 on the DB9 connector which is RXD
