X-418 Ethernet ADC
X-418™ Web-Enabled, Multi-Function 8-Channel Analog Input Module
In this example it is used to read vacuum sensors and is therefore calibrated again.
The X-418™ is a fully-featured, Ethernet module with an 8-channel, 16-bit, analog data acquisition system. Configure each channel as a single-ended or differential input.
Monitor and log sensors connected to the analog inputs using the X-418's intuitive web interface.
It can be controlled and/or monitored over any TCP/IP network including private networks, IP-based industrial control networks, and the Internet.
https://www.controlbyweb.com/x418/
https://www.controlbyweb.com/x400/x-400_users_manual.pdf
Modbus must be switched on in the interface of the X-418.
This example is for a DAC where the first channel is read out. You are welcome to add more channels.
You need an EPICS-Base as well as Aysn and the Modbus module. https://github.com/epics-modules/modbus
First you have to create a new IOC. Then edit your st.cmd and add these lines.
#drvAsynIPPortConfigure(const char *portName,
# const char *hostInfo,
# unsigned int priority,
# int noAutoConnect,
# int noProcessEos);
drvAsynIPPortConfigure("VAC0","xxx.xxx.xxx.xxx:502",0,0,1)
#drvAsynIPPortConfigure("VAC1","xxx.xxx.xxx.xxx:502",0,0,1)
#modbusInterposeConfig(const char *portName,
# modbusLinkType linkType,
# int timeoutMsec,
# int writeDelayMsec)
modbusInterposeConfig("VAC0",0,2000,0)
#modbusInterposeConfig("VAC1",0,2000,0)
#read Modbus value
#drvModbusAsynConfigure(portName, tcpPortName, slaveAddress, modbusFunction, modbusStartAddress, modbusLength, dataType, pollMsec, plcType)
drvModbusAsynConfigure("VAC0_1", "VAC0", 1, 3, 0x00, 2, 7, 100, "vac0")
#drvModbusAsynConfigure("VAC0_2", "VAC0", 1, 3, 0x02, 2, 7, 100, "vac0")
#drvModbusAsynConfigure("VAC0_3", "VAC0", 1, 3, 0x04, 2, 7, 100, "vac0")
#drvModbusAsynConfigure("VAC0_4", "VAC0", 1, 3, 0x06, 2, 7, 100, "vac0")
#drvModbusAsynConfigure("VAC1_1", "VAC1", 1, 3, 0x00, 2, 7, 100, "vac1")
## Load record instances
#dbLoadRecords("db/xxx.db","user=epics")
dbLoadRecords("db/modbus.db","P=AEI")
Then you have to edit the Makefile in the src folder.
hanvac_DBD += asyn.dbd
hanvac_DBD += modbusApp.dbd
hanvac_LIBS += asyn
hanvac_LIBS += modbus
In the db folder you also have to edit the Makefile.
At the end create the modbus.db with this content:
record(ai, "$(P):VAC0_1_RAW") {
field(DTYP,"asynFloat64")
field(INP,"@asyn(VAC0_1)FLOAT32_LE")
field(SCAN,"1 second")
}
# THERMOVAC Transmitter TTR 911 N
# cali V_out = log10 (P_mbar) x 1.286 + 6.143
record(calc, "$(P):VAC0_1") {
field(DESC, "Presure")
field(SCAN,"1 second")
field(CALC, "10^((A-6.143)/1.286)")
field(INPA, "$(P):VAC0_1_RAW.VAL")
field(EGU, "mbar")
}