mwis750 Posted February 16, 2018 Report Share Posted February 16, 2018 Hi, I'm using USP-070 with UAC-02RSC. I setup two MODBUS masters - one on COM1 (9600 8N2) and one on the additional port (9600 8E1). For each master I've defined 30 slaves with two periodic operations (period 1 min). The first modbus line works without any issues however on the second one I'm getting weird results - around half of reads are successful the rest returns status 3. Status of operation is set to -11. I can't find any documentation what it means. There are no dropped packages, and each slave was double checked to make sure it uses correct transfer params (9600 8E1). Any ideas what can be wrong, or what -11 means ? thank you, Michal Quote Link to comment Share on other sites More sharing options...
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