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Hardware configuration
CNC 8065
4.
(REF: 1404)
CENTRAL UNIT ICU.
4.8 RS422 serial line connection.
Pinout of the central unit connector.
9-pin male SUB-D type connector.
The reserved pins must NOT be used in any case.
Cable characteristics.
Twisted-pair shielded cable should be used to minimize interference between cables, thus
preventing poor communication in long lengths.
Node connection.
Line terminating resistor.
Module interconnection.
The cable shield must be connected to the connector at both ends. It is recommended to
reference all the control and data signals to the same point (pin 5 GND), thus avoiding
reference points with different voltages because there could be voltage differences in long
lengths between the two ends of the cable.
Characteristic.
Type. Shielded. Twisted-pair, with a minimum wire section of 0.20 mm² (24 AWG).
Impedance. 120Ω.
Maximum length. 1200 m (3937 ft).
All the elements of the bus must have the line terminating resistor
activated. The central unit has the resistor inside at pins 2 and 3; to
activate it, jumper pin 2 with pin 8 and pin 3 with 9.
Pin. Signal. Description.
1 - - - - - -
2 LineTerm 120Ω line terminating resistor.
3 LineTerm 120Ω line terminating resistor.
4 - - - - - -
5 GND Reference signal.
6 TxD Send data.
7 /TxD Send data.
8 RxD Receive data.
9 /RxD Receive data.
Pin
GND
/Line Term
Line Term
5
4
3
2
1
9
8
7
6
/RxD
RxD
/TxD
TxD
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