Basic Documentation

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Siemens RWD Primary Controls Modbus Interface CB1P3099en_01
Building Technologies Product Overview 27.10.2009
RS232 Interface
A 1.5 meters long RS232 cable is provided together with SEZ50MB and the RS232
cable is one-to-one type (the same pin numbers are connected at both ends of this
cable). The DB9 male socket of the RS232 cable will be connected to RWD device
while the female plug will be connected to SEZ50MB.
The table below lists the pin numbers and their corresponding functions of DB9 female
plugs of RS232 interface connected to SEZ50MB:
Pin No. Descriptions Functions (SEZ50MB side)
1 Not Used Not Used
2 RXD Receive Input
3 TXD Transmit Output
4 Voltage Output 1 DC +12 V
5 Reference Ground RS232 0 V
6 Not Used Not Used
7 Voltage Output 2 DC -12 V
8 Not Used Not Used
9 Not Used Not Used
Note: The DB9 male socket of RS232 interface connected on the RWD device will have TXD at Pin 2
and RXD at Pin3; Pin 4 & 7 will be “Inputs”.
The SEZ50MB device address can be set via a 8-way DIP switch and the valid
addresses are 1 to 247.
DIP switch Position à 1 2 3 4 5 6 7 8
Address No. Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Broadcast Address (=0)
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 1
... ... ... ... ... ... ... ...
User Addresses (=1 to 247)
1 1 1 1 0 1 1 1
1 1 1 1 1 0 0 0
... ... ... ... ... ... ... ...
Reserved Address (=248 to 255)
1 1 1 1 1 1 1 1
The communication settings such as baud rate, parity and stop bits can be set via a 4-
way DIP switch.
Device Address Bit
ON
1
2
3
4
5
6
7
8
Device Setting
ON
1
2
3
4
DIP switch
Position
Function Settings ON (1) or OFF (0)
ON 19200 bps (Default)
1
Baud Rate Selection
OFF 9600 bps
2, 3
Parity & Stop Bits
OFF
ON
OFF
ON
OFF
OFF
ON
ON
ODD Parity, 1 Stop Bit
Even Parity, 1 Stop Bit (Default)
None Parity, 2 Stop Bits
None Parity, 2 Stop Bits
ON No Function
4
Reserved
OFF No Function (Default)