
B–63443EN/02
7. CONNECTION TO CNC PERIPHERALS
HARDWARE
81
1) The CRT terminating unit (A02B–0124–D001) is designed to enable
adjustment of the waveform of a CRT link (RS485). The CRT/MDI
unit may operate normally without a CRT terminating unit, provided
the CRT link is short, or if the operating environment is free of noise.
For qualitative evaluation, however, always install a CRT terminating
unit prior to shipment. If the CRT terminating unit is not mounted,
the CRT screen may not be updated, and the keys may fail to operate.
2) A CRT link is terminated at connector JD15 of Power Mate. The
CRT/MDI has a built–in terminating resistor.
CRT/MDI
unit
Terminating
resistor
Terminating
unit
Power
Mate
CRT link
JD15
3) The CRT/MDI unit terminates the following signals with 200 ohms,
1/4 W:
RXD (JD15-1) *RXD (JD15-2)
TXD (JD15-3) *TXD (JD15-4)
Resistor
Insulating heat–
shrinkable tube
NOTE
For A02B–0124–D001, pins other than pin 3 are also
terminated. This does not affect the Power Mate 0, however.
7.1.4
CRT Terminating Unit