Procon V3D Series, Programmer'S Manual

Page: 6 / 88

H - I - J
PROGRAMMER’S MANUAL
V8.94.11-
- 6 -
Serial line communication
The RS485 serial line communication is implemented with a 6-pole telephone connector and a 6-wire telephone cable
of custom length.
If the cable becomes faulty or a new cable is needed for any other reason, followings have to be considered for the
replacement:
8
CAUTION
Since the serial line connectors also carry supply voltage (+9 V), the assignment of the connector socket pins is
identical in any case!
The connecting cables always must connect pin 1 of a connector socket to pin 1 of the other connector socket (and
all other pins in this way, respectively)
Simple commercial telephone extender cables reverse the pin assignment therefore they are not suitable here,
because they cause short circuit!
The demands pertaining to the serial cable (length, design etc) must be co-
ordinated with the frequency converter’s
manufacturer!
A correct connection can only be established with this arrangement of the 6-wire telephone cable:
Length of the serial line
In case of a remote located terminal or display, the length of the terminal connecting cable is limited by the ohmic
resistance because -
due to the display’s background lighting - the current consumption is not negligible.
In case of standard 6-wire telephone cable a maximum length of 10 m can be used. This assures that the 9 V supply
voltage will still be sufficient for the externally connected terminal or the internal power supply of the display. If the
terminal is connected through a thicker cable and adapter, the ohmic resistance of one cable wire should be calculated
for not to exceed the value of 2 ohms.
e.g. at using a wire with a cross section of 0.5 mm
2
the maximum length can be 50 m.
at using a wire with a cross section of 1.0 mm
2
the maximum length can be 100 m.
When connecting more than one equipment to the serial line, this applies for the total length of the connecting cables,
since the supply voltage for the externally connected terminal or display may happen to be supplied by the farthest
equipment, if it is the only one being switched on!
If the terminal or display is powered through a short cable (e g. from an independent external power supply, the length
of the connecting cables is not limited!
i
When using long cables, shielded cable or at least twisted-pair cable should be used!
The serial line can accept two equipment with backlight, at the same time.
Two displays or one (programming or operating) terminal plus one display. Beyond these, connecting a
computer is allowed.
These can operate in parallel without disturbing each other.
The 2x8-character controlling terminal can be connected to any equipment irrespective of the other equipment with
backlite, because it loads not the supply voltage of the serial line. It cannot be of external mounting, it can only be used
built in the equipment!