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T H E M O D E R N M - B U S T E C H N O L O G Y
PiiGAB Process Information i Göteborg AB
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Serial communication cables
6
6.1
General Information
The serial connection on the gateway consists of 6 positions female module (often
called RJ12.) Since there are many different areas of usage for the serial
connection, we can offer a number of adapters from 9-pin DSUB to RJ12. It is
important that the right module cable is used between the adapter and the RJ12
connector on the gateway. There are both a straight and a crossing cable on the
market. The gateway needs a
direct cable
.
To determine whether you have a direct or a crossed cable you should hold both
of the RJ12 connectors next to each other with the contacts facing yourself. If the
colors are in the same order on both contacts you have a
direct cable
. If the
colors are arranged in opposite order your cable are crossed.
The adapters are connected to the communication port on the computer. A
straight cable is used between the adapter and the gateway. When the spying is
done both regarding the answer and the question an additional branch connection
is used for the module cable.
6.2
Serial to M-Bus
To communicate via the serial outlet directly to M-Bus adapter 1 is used.
Connect the adapter to the COM port and the straight module cable between the
adapter and the gateway’s RJ-12 contact.
With this connection the 810 gateway becomes a serial (RS232) to M-Bus
converter. This function is for debugging and control of the communication onto
the M-Bus loop.
Examples of usage:
At start-up on the M-Bus loop you can with the help of a laptop verify that
you have contact with the different meters before you connect yourself to
the network.
If you do not have the network available for all the meters you can use a
GPRS modem with an IP stack. Let the modem’s RS232 output go via the
gateway. When the network has been built out you can connect it to the
network port on the gateway instead.
You can also use the gateway as a pure serial to the M-Bus converter of
course.
Chapter
6