Siemens SEZ50MB Operating Instructions

Operating Instructions
Product Overview:
The SEZ50MB unit is a RS485 type Modbus communication interface (RTU mode only). It connects with
RWD controllers via RS232 interface for remote monitoring functions. SEZ50MB Modbus communication
can be developed by users according to Modbus Application Protocol Specification V1.1b
(www.Modbus.org), or users can use Siemens Modbus SW tool as the SEZ50MB Modbus interface.
Modbus Connection
The SEZ50MB Modbus Interface Unit enables remote monitoring on RWD devices on the same network
(Modbus). The BUS topology is recommended, i.e. one single bus.
RX TX
A
TX RX
GND GND
RS232-TO-RS485 Converter
Isolated Converter Recommended
B
USB
USB
RS232-TO-RS485 Converter
Isolated Converter Recommended
Siemens Building Technologies / HVAC products
SEZ50MB
RS232 RS232 RS232 RS232
RWDxx
RWDxx SEZ50MB SEZ50MB
+ - Ref + - Ref
...
D+ +
D- -
GND Ref
RWDxx
RS232
Modbus RS485 Type
Max Cable Length = 1000 m
RS232
RS232 RS232 RS232
RWDxx
RWDxx SEZ50MB SEZ50MB
+ - Ref + - Ref
...
D+ +
D- -
Ref
GND
RWDxx
RS232
Modbus RS485 Type
Max Cable Length = 1000 m
B3099
Power Supply Interface
G & G0 terminals are for AC 24 V SELV power supply (LED indicates power on).
Modbus RS485 Interface
+, - Differential Signals
Ref Differential COMMON
RS232 Interface to RWD Device (DB9 Connector)
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.
ON
1 2 3 4 5 6 7 8
The SEZ50MB device address can be set via an 8-way DIP switch and the valid addresses are 1 to 247.
Termination
Resistance of
both ends Address No.
150 Ω
Broadcast Address (= 0)
+
User Addresses (= 1 to 247)
-
+ - Ref
Reserved Address (= 248 to 255)
SEZ50MB
RS232
ON
Device Setting
1 2 3 4
The communication settings such as baud rate, parity and stop bits can be set via a 4-way DIP switch.
DIP switch Position
Termination
Resistance
of both ends
1
150 Ω
+
2, 3
-
+ - Ref
SEZ50MB
RS232
4
20.10.2009
Pin No. Descriptions
1 Not Used
2 RXD
3 TXD
4 Voltage Output 1
5 Reference Ground RS232
6 Not Used
7 Voltage Output 2
8 Not Used
9 Not Used
Device Address Bit
DIP switch Position à
1 2
Bit7 Bit6
0 0
0 0
1 1
1 1
1 1
Function Settings ON (1) or OFF (0)
ON
Baud Rate Selection
OFF
OFF
ON
Parity & Stop Bits
OFF
ON
ON
Reserved
OFF
Functions
Not Used
Receive Input
Transmit Output
DC +12 V
0 V
Not Used
DC -12 V
Not Used
Not Used
3 4 5 6 7 8
Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0 0 0 0 0 0
0 0 0 0 0 1
1 1 0 1 1 1
1 1 1 0 0 0
1 1 1 1 1 1
19200bps (Default)
9600bps
OFF ODD Parity, 1 Stop Bit
OFF Even Parity, 1 Stop Bit (Default)
ON None Parity, 2 Stop Bits
ON None Parity, 2 Stop Bits
No Function
No Function (Default)
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