Experimental Physics and
Industrial Control System

I have an IOC that is currently reading registers via modbus rtu over rs485.  There are a set of registers that store multiple configuration options in a single register.  I set up the port using this line:

> drvModbusAsynConfigure("Z8TC1_Config", "SenecaBus", 5, 6, 53, 4, "UINT16", 100, "SenecaZ")

I've enabled the debugging lines on this IOC. When the IOC starts, I can see that the correct registers are being retrieved when the port is created.  I can also write config changes to those registers at their assigned PV's with no issues that I have found.  My issue is that the PV values aren't being updated when the IOC starts -- meaning that after the IOC start, the bo and mbbo values stored in that register don't match what was returned via the initial modbus request.

Here are a couple of the DB entries that I'm using:

record(bo,"$(P)$(R)-TC1_enable") {
    field(DTYP,"asynUInt32Digital")
    field(OUT,"@asynMask($(PORT), 0, 0x8000 )")
    field(ZNAM,"Disabled")
    field(ONAM,"Enabled")
}

record(bo,"$(P)$(R)-TC2_enable") {
    field(DTYP,"asynUInt32Digital")
    field(OUT,"@asynMask($(PORT), 0, 0x4000 )")
    field(ZNAM,"Disabled")
    field(ONAM,"Enabled")
}

record(bo,"$(P)$(R)-TC1-2_units") {
    field(DTYP,"asynUInt32Digital")
    field(OUT,"@asynMask($(PORT), 0, 0x2000 )")
    field(ZNAM,"tempDegC")
    field(ONAM,"mV")
}

Any help is appreciated.

Dale