Technical Notes

Table Of Contents

Signal Discription 
Timing Chart When The Fanuc NC Receives Data Into Memory. 
Timing Chart When The Fanuc NC Sends Data To External Device. 
ISO Tape Code Chart 
EIA Tape Code Chart 
Cable Information 
Fanuc Connections And Parameters

There is three options for the customer who requires any of these boards:

OPTION ONE:
The malfunctioning board can be sent to us and we will forward it to Japan to be repaired. Lead time could vary but expect it to take at least 8 weeks.

OPTION TWO: 
The Retrofit/Accessory Department has available a Fanuc 3000C PLC Retrofit Unit. This would replace the need for all three of these boards. Contact your service representative for details.

OPTION THREE:
Get a Fanuc control upgrade. This would replace your entire control and servo system. Contact your service representative for details.

Signal Description Signal Name Pin # I/O Description SD 2 O Sending Data RD 3 I Recieving Data RTS 4 O Request To Send: This Signal is set to on when the NC starts sending data and is turned off when the transmission ends. CTS 5 I Clear To Send: When this signal and the DSR signal are set high, the NC can send data from SD. If this signal is set low the NC will stop sending data after two more characters are sent. Jump 5 to 4 if signal isn't used. DSR 6 I Data Set Ready: When the external device is ready to operate to needs to set this signal high. If this signal goes low anytime during data transfer, NC alarm 86 will occur. Jump 6 to 20 if signal isn't used. SG 7 - Signal Ground CD 8 I Carrier Detect: Signal must be straped to DTR. Jump 8 to 20 in cable. DTR 20 O Data Terminal Ready: This Signal is set to on when the NC is ready for operation. FG 1 - Frame Ground: This electrically connects the NC cabinet ground to your extirnal device's ground. Note: If grounds are of a different potential between devices, damage to equipment and/or electric shock can occure. Be sure all equipment is properly grounded!

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Timing Chart When The Fanuc NC Receives Data Into Memory. 1. NC outputs DC1. 2. The external device starts sending data upon receiving DC1. 3. The NC sends DC3 when the NC processing is delayed or input buffer is full. 4. The external device stops sending to the NC after receiving DC3. The external device can send up to 10 characters after receiving DC3. If more than 10 characters are sent after the DC3 was sent alarm 87 will occur. 5. The NC sends DC3 after completing delayed processing and input buffer is empty. 6. The external device resumes sending data after receiving DC1. 7. NC sends DC3 upon completing data read 8. The external device stops sending data to NC.

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Timing Chart When The Fanuc NC Sends Data To External Device 1. NC outputs DC2. 2. NC outputs punch data in succession. 3. When data processing is delayed by the external device, including the character currently being sent if the CTS (CS) signal is turned off:   a) Data output stops within two characters including the currently transmitted character when CTS (CS) signal is input to the NC. When CTS (CS) signal is turned on again, data transmission starts. (Fig. A)

Fig. B

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ISO Tape Code Chart

EIA Tape Code Chart

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NC Control   Computer   DB25M     DB25F DB9F SD 2 ------\/------   SD 2 SD 3 RD 3 ------/\------   RD 3 RD 2 SG 7 --------------   SG 7 SG 5 RTS 4 ------\/------   RTS 4 RTS 7 CTS 5 ------/\------   CTS 5 CTS 8 DSR 6 ------\/------   DSR 6 DSR 6 DTR 20 ------/\------   DTR 20 DTR 4 CD 8 -----/     Cable without hardware handshaking NC Control   Computer   DB25M     DB25F DB9F SD 2 ------\/------   SD 2 SD 3 RD 3 ------/\------   RD 3 RD 2 SG 7 --------------   SG 7 SG 5 RTS 4 ------| |-----   RTS 4 RTS 7 CTS 5 ------| |-----   CTS 5 CTS 8 DSR 6 ------| |-----   DSR 6 DSR 6 DTR 20 ------| |-----   DTR 20 DTR 4 CD 8 ------|