Inobu,
On 1 Jan 2020, at 4:05 PM, Dave Heap via Groups.Io <dgheap@...> wrote:
It says there's something wrong with your particular system. I'd suspect a below-spec RS485 chip that is causing cab bus flooding and buffer overflow in either device and hence locking up communications. This was what was happening when we worked through this original problem with NCE and came up with the PCP fix Your "workaround" is possibly just avoiding this.
I know you have tried several different Power Cabs. But you haven't reported whether your PCP has the extra-resistors fix documented at the following link:
<>
The site claims that only a limited range of Power Cabs are affected, but I've had reports of NCE USBs that show the symptoms of sub-spec chips.
Setting up an unterminated RS485 bus (bad practice) and relying on special lockup-proof transceiver chip models wasn't a robust move. It was done for what seemed a good reason at the time (reluctance to put terminators in the Power Cab due to its secondary applicability as a slave cab on already-terminated Power Pro systems). When we tracked the problem down it was realised that putting terminators on the PCP (of which there should never be more than one) solved the problem completely. The retrofit was recommended and all newer production runs of the PCP were fitted with terminators.
Dave in Australia
