Fagor CNC 8070 - 5.12.4 RS485 serial line connection.

Hardware configuration.
CNC 8070
5.
CENTRAL UNIT + MONITOR (ETX PLATFORM).
Connections.
·86·
(REF: 1911)
5.12.4 RS485 serial line connection.
Connector pinout.
Plug-in part. 9-pin female SUB-D type connector.
Pins 6-8 and 7-9 are internally jumpered, thus either one can be used in the connection. 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.
Interconnection of modules.
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. 120.
Maximum length. 15 m (50 ft).
The elements located at the ends 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 one of the pins 6/8 and
pin 3 with one of the pins 7/9.
Pin. Signal. Description.
1 - - - - - -
2 LineTerm 120line terminating resistor.
3 LineTerm 120line terminating resistor.
4 - - - - - -
5 GND Reference signal.
6 TxD RxD Data send/receive.
7 /TxD RxD Data send/receive.
8 TxD RxD Data send/receive.
9 /TxD RxD Data send/receive.
1 ... 5
6 ... 9
Pin
GND
/Line Term
Line Term
5
4
3
2
1
9
8
7
6
/TxD /RxD
TxD RxD
/TxD /RxD
TxD RxD
TxD RxD
/Line Term
Line Term
/TxD /RxD
TxD RxD
GND
/TxD /RxD
6
3
2
9
8
5
7
/TxD /RxD
TxD RxD
GND
Housing
Housing
1
4
CNC