Appendix E Modbus RTU Communication Protocol
D02706R02.30
L-PRO 4000 User Manual
Appendix E-7
Force Single Coil (Function Code 05)
Only the “hold readings” coil can be forced. When active, this coil locks all coil, input and holding register readings simultaneously
at their present values. When inactive, coil, input and holding register values will read their most recently available state.
Channel
Type
Address
Value
Hold Readings
Read/Write
01
0000: Readings update normally (inactive)
FF00: Hold readings (active)
Preset Single Register (Function Code 06)
Channel
Address
Value
Scaled Up By
Event Message Control (See below for details of use)
Refresh event list
40513
No data required
N/A
Acknowledge the cur-
rent event and get the
next event
40514
No data required
N/A
Get the next event
(without acknowl-
edge)
40515
No data required
N/A
Event Buffer Size
100
Self Check Fail
Parameter
40317
N/A
1
Diagnostic Subfunctions (Function Code 08)
Return Query Data (Subfunction 00)
This provides an echo of the submitted message.
Restart Comm. Option (Subfunction 01)
This restarts the Modbus communications process.
Force Listen Only Mode (Subfunction 04)
No response is returned. IED enters “Listen Only” mode. This
mode can only be exited by the “Restart Comm. Option” com-
mand.
Report Slave ID (Function Code 17/0x11)
A fixed response is returned by the IED, including system model, version and issue numbers.
Channel
Type
Bytes
Value
Model Number
Read Only
0 and 1
0xFA0 = 4000 decimal
Version Number
Read Only
2 and 3
Version number
Summary of Contents for L-PRO 4000
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