13
Operation Modes when using Modbus
4.2. MODBUS SPECIAL HOLDING REGISTERS
Four special holding registers can be read and written to, regardless of operating mode, to allow a Modbus server
to enter controller’s password, check status, as well as view and set remote operating modes.
Address Register
Size Note
40193
Remote password 32‑bit Low part of 32‑bit password (bytes
1‑0
)
40194
High part of 32‑bit password (bytes
3‑2
)
40195
Remote
Mode control
8‑bit
B0 Remote link
(read only)
0
= no link between controller and server
1
= link present between controller and server
B1 Set Remote Control View Mode
0
= Controller settings can be done locally
1
= Controller settings can be done only remotely
B2 Set Remote Control Edit Mode
0
= Settings can't be done remotely
1
= Settings are done remotely on an image of controller settable
parameters
B3 Save Settings done on Remote Control Edit Mode
1
= Settings done on Remote control Edit Mode are saved after review of
validity change
40196
Reset
Controller status
32‑bit bytes
1‑0
b0
= R/W controller setup updated
b1
= R/W CH1 calibration updated
b2
= R/W CH2 calibration updated
b3
= RO ‑ CH1 probe update parameters
b4
= R/W ‑ CH1 probe parameters updated
b5
= Cleaning active
b6
= Local edit mode active
b7
= Manual mode active
b8
= CH1 calibration mode active
b9
= Remote Control Mode active
b10
= Remote Control Edit mode active
b11
= Controller in Hold mode
b12
= Controller in startup mode
b13
= Manual Hold active
b14
= External Hold active
