Hi guys I'm currently working with a Binder Oven and at the moment I believe the oven's Rs422 interface is dameged but I need to find a valid way to test it.
To communicate to this oven I am using a Startech 1 port Rs232/422/485 Over IP Adapter.
The interface to the oven is Rs422, although the protocol used to communicate is Modbus.
Researching Rs422 I found that is a differential bus having 4 lines to communicate.
Rx+
Rx-
Tx+
Tx-
Now when I measure the voltage levels on the Star tech device I find that the Tx+ and Rx+ lines are +5V and the TX-/Rx- lines are 200mV.
When I try measure the interface on the Binder Oven I find that there is no voltage at all on these lines? (Measuring using an oscilliscope and multi meter)
My question is is there a valid way to test an RS-422 interface that is on a machine and not on a PC's communications port?
I have searched all over online but I still havent found a valid test.
Thank You.
T2DJ.