Central Processing Unit
5–22
1070 072 145-102 (01.07) GB
5.4.5 X32 Second Serial Interface
This V.24 interface on the ZE201 utilizes a female DB-9 connector and is
compatible with the COM port on a PC. For example, in the event that a con-
trol terminal is connected to X31, this second serial interface can be used to
connect the programming unit.
As the V.24 interface is not electrically isolated from logic circuits and power
supply, this may on rare occasions connectivity problems with devices
whose interface also lacks electrical isolation.
If this is the case, sufficient potential equalization must be established bet-
ween the reference conductors of both interfaces. Only a small potential dif-
ferential may exist between transmitter and receiver, for example:
–2 V < U
diff
< +2 V.
Pin assignment of female DB-9 connector:
Pin Signal designation Signal function
2 RxD PLC receive data
3 TxD PLC transmit data
5 GND Reference conductor, Ground
Housing Screen Screening
The maximum cable length is 15 m for all baud rates.
Transmission protocols
The X32 interface supports the following transmission protocols:
D BUEP19E (PST, as for X31)
The BUEP19E protocol of the second interface provides functional com-
patibility with the X31 PG interface. The AST function is not available.
D BUEP03E
As is the case with the intelligent modules, the BUEP03E is handled via
the R2REQ and R2CON function modules. To send requests via the X32,
all that is required is to address the fictitious RSS number “FFH”.
Basic setting
The following basic setting generally applies to the second serial interface
immediately after Power-ON:
D 19200 baud
D 1 Stop bit
D Even parity
D 8 Data bits
D BUEP19E protocol
In the event that a change of transmission protocol and transmission speed
is required, the desired declaration is made in the OM2. The new constella-
tion is set with data word 36. Configuration baud rates are 600, 1200, 2400,
4800, 9600, and 19200 baud.
The second serial interface always uses one stop bit and active parity. Con-
trol signals are not supported.
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