Central Processing Unit
5–19
1070 072 145-102 (01.07) GB
5.4.4 X31 Interface for PG Programming Unit
The X31 is a combination V.24 / 20 mA interface in accordance with VDI Gui-
deline VDI 2880, Page 2.
The X31 female DB-25 connector accepts the PG programming unit or an-
other peripheral device, such as the BT20 control panel, for example.
X31 PG program-
ming unit interface
The transmission protocol used on this interface is the BUEP19E (PST).
Baud rate
The baud rate for the X31 programming unit interface is selected with the use
of the S1 DIP switch onboard the central processing unit.
S1 DIP switch
4321
OFF
ON
CAUTION
Do not insert or remove the module while the controller is switched
ON! This may destroy the module. Prior to inserting or removing the
module, ensure that module is not energized!
Baud rate [Baud] S1/1 S1/2
57600 ON ON
38400 OFF ON
19200 ON OFF
9600 OFF OFF
Switch segments S1/3 and S1/4 are not being used at this time, and shall
therefore be set to OFF.
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