JVL Industri Elektronik A/S - User Manual - Integrated Servo Motors MAC050 - 800
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5.9
Bus serial communication
5.9.1
Important information concerning RS-232.
Be sure to read this before trying to use RS-232 with any of the JVL modules or motors.
Also if you do not plan to use multidrop.
The widely used RS-232 connection is a point-to-point solution, where two systems are
connected by at least three wires: A common Grounds and two data wires, where data
is transmitted serially from TxD (Transmit Data) pin on the sender to a RxD (Receive Da-
ta) pin on the receiver. In addition to this, sometimes hardware handshake signals are
used.
The baud-rate and address factory setting are set to 19200 baud and comport 1. The unit
can be set up via the MacTalk program. The motor shall be terminated, the MAC-B1, B2
and B4 expansion modul contain this feature. Opto isolation is recommended, and al-
ways use screen cable. The interface cable should not exceed more than10 meters. Make
sure that GND is also connected.
The special RS-232 multidrop solution used with the products covered by this manual al-
lows more than two systems to be connected using the same wires.
With standard RS-232 the TxD pin in each end drives the signal to both high and low volt-
age levels, and it is an error to connect two or more TxD lines together since they would
conflict and generate invalid signal levels.
With the JVL multidrop RS-232 solution, the TxD line is only pulled to an active high
through a diode on the modules, and the line has a passive pull-down resitor that connect
the line to a negative supply voltage. This allows more than one module to drive the line,
but only one module can communicate data at a time.
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Страница 7: ...JVL Industri Elektronik A S User Manual Integrated Servo Motors MAC050 800 3 1 Introduction ...
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Страница 21: ...JVL Industri Elektronik A S User Manual Integrated Servo Motors MAC050 800 17 2 Function description ...
Страница 61: ...JVL Industri Elektronik A S User Manual Integrated Servo Motors MAC050 800 57 3 Hardware description ...
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Страница 81: ...JVL Industri Elektronik A S User Manual Integrated Servo Motors MAC050 800 77 4 Expansion Modules ...
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Страница 255: ...JVL Industri Elektronik A S User Manual Integrated Servo Motors MAC050 800 251 5 Appendix ...
Страница 299: ...JVL Industri Elektronik A S User Manual Integrated Servo Motors MAC050 800 295 5 15 UL Certificate of Compliance ...
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Страница 306: ...6 Index JVL Industri Elektronik A S User Manual Integrated Servo Motors MAC050 800 302 ...