Functional description and allocation of terminal pins Manual BG41/BG42/BG43
3-20 Rev. 99/49
3.2.5 RS422P (MD33) and RS485P (MD34) module floating
3.2.5.1 General
The module serves the point-to-point or the multidrop connection on the basis of the RS422/RS485
norm. The module possesses a potential separation.
When operating RS422P or RS485P modules on the bus ends, a 100Ω terminating resistor is
additionally connected by means of the existing switch on the module.
The terminating resistor is connected, when the switch is in the ON position.
Fig. 3-19: Structure of RS422P and RS485P modules
Please notice
Transmitter and receiver are always active on the module MD33. This module can send a "Break".
If using the MD34 the receiver only receives data when it does not send itself, that means one does
not receive the even sent data. MD34 is not Break-able.
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