Q
Quack
- Jan 1, 1970
- 0
Hi,
I have a device which sends data to a controller - but i want to
replace the controller with something of my own.
The problem;
The 'device' does not send out any data (test with scope) unless the
controller is hooked up.
A scope on the controller confirms it is sending out packets.
A scope on the device confirms it does nothing without controller.
(device is definantly responding though, there is data being
transfered when in normal operating conditions)
There is only 2 wires.
(i am told by manufacturer its RS422)
So can RS422 send AND receive via only 2 wires ? (obviously not
full-duplex).
If so, then how can i 'fake' the controller.
I have recorded from the controller what i need to say to the 'device'
in order to make it respond, but my simple rs422/rs485 serial
converter seems inadequate to the job. It implements a 4-wire system,
2tx, 2rx.
So by tieing Rx1 to Tx1 and Rx2 to Tx2, i can send - but then i cant
receive the response (through this converter)..
Basically i need a way to receive this response, directly after
sending a command to the device..
Any simple thing i can knockup from bits lying around - or is this
something that i should really purchase. In which case, what should i
buy exactly ?
Thanks for any help!,
Alex.
I have a device which sends data to a controller - but i want to
replace the controller with something of my own.
The problem;
The 'device' does not send out any data (test with scope) unless the
controller is hooked up.
A scope on the controller confirms it is sending out packets.
A scope on the device confirms it does nothing without controller.
(device is definantly responding though, there is data being
transfered when in normal operating conditions)
There is only 2 wires.
(i am told by manufacturer its RS422)
So can RS422 send AND receive via only 2 wires ? (obviously not
full-duplex).
If so, then how can i 'fake' the controller.
I have recorded from the controller what i need to say to the 'device'
in order to make it respond, but my simple rs422/rs485 serial
converter seems inadequate to the job. It implements a 4-wire system,
2tx, 2rx.
So by tieing Rx1 to Tx1 and Rx2 to Tx2, i can send - but then i cant
receive the response (through this converter)..
Basically i need a way to receive this response, directly after
sending a command to the device..
Any simple thing i can knockup from bits lying around - or is this
something that i should really purchase. In which case, what should i
buy exactly ?
Thanks for any help!,
Alex.