Data Sheet for Product

10 / 16
Siemens Room units with 2-wire interface CB2N3261en_03
2020-01-22
Technical design: Parameters
After the HMI-SG is connected to the controller and the communication is set up, it
will start parameter initialization. Parameter indicator (P--) will be displayed on
screen for a while. After parameter initialization is completed, it will be in normal
view. The parameter can be edited in service mode.
In service mode, there are 3 access level of parameter identified from C1 to C3:
· C1 Service engineers
· C2 OEM
· C3 Reserve
For each access level, a password can be assigned. The password consists of 4
digits and each with the range of 0 to 9.
There are 2 parameter privilege settings:
· Read Only (RO) -- The parameter can be read but user cannot change the
value.
· Read/Write (RW) -- The parameter is readable and changeable.
Parameters are represented either in groups or as plain list.
The format of grouped parameter is: "Xnn". "X" is a letter as the leading group
name and "nn" is the sequence number within the group. There are totally 10
groups in HMI-SG. For each group there are max 100 parameters.
The format of plain list is: "nnn". The "nnn" represents the sequence of parameters.
In total, 1000 parameters (000~999) can be represented.
By holding Plus, Minus and Mode button at the same time, HMI-SG will enter
service mode. The functions of keys in service mode are:
· Button ON/OFF: Cancel or go to previous page.
· Button Mode: confirm.
· The combinations of buttons described here are valid for all POL822.X0/XXX
devices, independet of specific naming.
· No operation for 1 minute will exit service mode.
1. Hold Plus, Minus and Mode button at the same time.
HMI-SG enters service mode, and the page of inputting password will be
displayed.
Parameter initialization
Access level
Note
Parameter
privilege
Group and plain list
Service mode
Edit parameter