Monroe-electronics Electrostatic Fieldmeter - Static Monitor - model Manuale Utente Scaricare il pdf (Pagina 48)

APPENDIX IV

Communication with ME 177A using MODBUS Protocol

Read Channel LEDs or Relays (read coil)

Write Channel LEDs or Relays (write coil)

Read Channel display (read register)

Write Channel display (write register)

Read Channel LEDs or Relays (read-coil):

From Master (PC software or PLC):

Unit# Command CoilAdrH CoilAdrL lenHigh lenLow crcH crcL

1-255 0x01 0 0-24 0 1

The request consisted of the unit# and the command code 01 followed by a 2 byte starting address,

specifying the variable to be read.

Length high must be 0, length low is 1.

CoilAdrH is 0

CoilAdrL is as follows:

0 Channel 1 Alarm (red) LED

1 Channel 2 Alarm (red) LED

2 Channel 3 Alarm (red) LED

3 Channel 4 Alarm (red) LED

4 Channel 1 Warning (Amber) LED

5 Channel 2 Warning (Amber) LED

6 Channel 3 Warning (Amber) LED

7 Channel 4 Warning (Amber) LED

8 Channel 1 OK (Green) LED

9 Channel 2 OK (Green) LED

10 Channel 3 OK (Green) LED

11 Channel 4 OK (Green) LED

12 Channel 1 Alarm Relay

13 Channel 2 Alarm Relay

14 Channel 3 Alarm Relay

15 Channel 4 Alarm Relay

16 Channel 1 Warning Relay

17 Channel 2 Warning Relay

18 Channel 3 Warning Relay

19 Channel 4 Warning Relay

20 Channel 1 OK Relay

21 Channel 2 OK Relay

22 Channel 3 OK Relay

23 Channel 4 OK Relay

24 System Alarm Relay

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 95 96

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Monroe-electronics Electrostatic Fieldmeter - Static Monitor - model Manuale Utente Pagina 48