3 Interface module
3.1 General 3-1
3.1.1 Voltage supply 5V and 24V 3-1
3.1.2 LED indicators on the modules 3-2
3.1.3 Selection table: function - module - function blocks 3-3
3.2 Functional description and allocation of terminal pins 3-4
3.2.1 20mA current loop-modul (MD25) 3-4
3.2.2 RS232C module (MD22) 3-9
3.2.3 20mA current loop/RS232C combination module (MD26) 3-12
3.2.4 RS422/RS485 module (MD21) 3-14
3.2.5 RS422P (MD33) and RS485P (MD34) module floating 3-20
3.2.6 CENTRONICS module (MD24) 3-22
3.2.7 SSI module (MD39) 3-24
3.2.8 Counter module (MD18,19) 3-33
3.2.9 Analogue input (MD40-44) and output module (MD45-49) 3-47
3.2.10 DCF77 antenna module (MD36) 3-74
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