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GW-7553-CPM PROFIBUS/CANopen GATEWAY User Manual
(Version 1.00, Apr/2016)
PAGE: 9
2.3.1 RS-232 connection
The RS-232 port of the GW-7553-CPM has got three pins. The wiring of the
RS-232 device with the RS232 port of the GW-7553-CPM is shown in figure 4.
Figure 4 RS-232 wiring diagram
2.3.2 PROFIBUS Connection
The PROFIBUS interface of the GW-7553-CPM is a DB9 female connector.
The connector uses the standard PROFIBUS 9 pin assignment. It is
recommended to use a standard PROFIBUS cable and connector (DB9 male).
As with every serial bus the rate of safe data transmission in a PROFIBUS
network decreases with increasing distance between master and slave. Table 7
shows the transmission rate and range for a cable with the following properties:
1.
Impedance :135~165Ω
2.
Capacity : lower than 30 pF/m
3.
Loop resistance : lower than 110Ω/Km
4.
Wire diameter : greater than 0.65mm
5.
Core cross-section : greater than 0.34mm
2
Table 5 Transmission rate decreasing with increasing transmission distance
Transmission Rate(Kbps)
Transmission Distance per Segment (meter)
9.6; 19.2; 45.45;93.75
1200
187.5
1000
500
400
1500
200
3000; 6000; 12000
100
GW-7553-CPM
RS-232 COM port
RS-232 device
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