Remote communication, Hardware connection and cabling, 6 remote communication – ROTRONIC MBW 473 User Manual
Page 39: 1 hardware connection and cabling
MBW473_MANUAL_E_V2.0
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6 Remote Communication
The 473 is equipped with a bidirectional RS-232 communications interface which allows connection to
a computer. This section provides the necessary information for the use of the interface, including the
hardware connections, communications settings, and the command syntax.
6.1 Hardware Connection and Cabling
Connect a computer to the 473 using a standard RS-232 9-pin extender cable. The extender cable
has a male connector on one end and a female connector on the other. If your computer has a 25-pin
serial port connector rather than a 9-pin connector, you will also need a 25-pin to 9-pin port adapter.
Both the 9-pin RS-232 extender cable and the 25-pin to 9-pin port adapter are commonly available at
most computer hardware dealers.
The 473 ignores the DSR and CTS handshaking signals. While there is no harm in connecting all 9
pins, the 473 only requires connection of three of the pins (pins 2=TxD, 3=RxD and 5=GND). For your
reference, the complete connector pin-out is listed in the following table. Note that the signals identi-
fied by * are required, while the others are optional.
Signal
473
(9 pin)
Direction
Computer
(9 pin)
Computer
(25 pin)
1
1
8
*TxD
2
2
3
*RxD
3
3
2
DSR
4
4
20
*GND
5
5
7
DTR
6
6
6
CTS
7
7
4
RTS
8
8
5
9
9
22
* Denotes a required connection. All others are optional.