Monroe-electronics Electrostatic Fieldmeter - Static Monitor - model Manuale Utente Scaricare il pdf (Pagina 49)

177A reply to read coil:

Unit# command # of data Coil Value crcH crcL

1-255 0x01 1 0=Off, 0xff=On

Write Channel LEDs or Relays (write coil):

From Master (PC software or PLC):

Unit# Command CoilAdrH CoilAdrL New Value 0 crcH crcL

1-255 0x05 0 0-24 0=Off, 0xff=On

The request consisted of the Unit address and the command code 05 followed by a 2 byte starting

address, specifying the variable to be set, a data byte, specifying the binary value to set ( ON = 0xff,

OFF = 0 ) and an additional byte always set to 0.

177A reply to write single coil is identical to the received packet:

Unit# Command CoilAdrH CoilAdrL New Value 0 crcH crcL

1-255 0x05 0 0-24 0=Off, 0xff=On

Read Channel display (read register):

From PC or PLC:

Unit# Command RegAdrH RegAdrL LenH LenL crcH crcL

1-255 0x03 0 0-3 0 1

RegAdrL is as follows:

0 Channel 1

1 Channel 2

2 Channel 3

3 Channel 4

177A reply:

Unit# Command # of data dataH dataL crcH crcL

1-255 0x03 1 ## ##

Write Channel display (write register):

From PC or PLC:

Unit# Command RegAdrH RegAdrL dataH dataL crcH crcL

1-255 0x06 0 0-3 ## ##

177A reply to write single Register is identical to the received packet:

Unit# Command RegAdrH RegAdrL dataH dataL crcH crcL

1-255 0x06 0 0-3 ## ##

Note:

If the Unit# is 0, the 177A units will execute the Write-Coil and Write-Register commands, but No reply.

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Monroe-electronics Electrostatic Fieldmeter - Static Monitor - model Manuale Utente Pagina 49