L15 Series Operator Manual
26
Appendix A: RF Driver D-sub 15 Connector
ENGINEER’S NOTES (cont.)
PIN 1 5V DC regulated supply output line. 20 mA source capacity. Intended to light
remote “Power On” LED. (
Important:
no internal series current limiting resistor
provided on this line.)
PIN 2
This output line is a “Laser Ready” indicator in both the Safe CDRH mode and
the OEM mode. When LOW, it indicates a fault has occurred and the laser is
shut down: RF amplifier over heated, DIN cable not connected or RF cable not
connected or damaged. The Amplifier will operate for approximately one
minute on start-up before the processor checks for faults. This allows some
troubleshooting before a Fault Shutdown. In the Safe CDRH mode two
additional faults are indicated by PIN 2. The Key Switch fault status (see
description of PIN 3) and the Interlock Fault Status (see description of PIN 4).
This is an un-buffered output of 3.8V DC with internal 390 ohm current limiting
resistor R101. If remoting this signal, we recommend buffering.
PIN 3 Key Switch is an active LOW input line. The Key Switch is a safety requirement
for many laser systems. PIN 3 is internally pulled HIGH with a 10k resistor
R41. The Key Switch is only functional in the Safe CDRH mode (PIN 6 LOW).
To implement a Key Switch use the normally open contacts. (Key Switch “on”
is PIN 3 pulled LOW). The Key Switch has to be turned on before the laser can
operate. When there is a power outage the Key Switch has to be recycled to
restore laser operation. The key should not be removable when the Key Switch
is turned on.
PIN 4 Safety Interlock is an active HIGH input line. The Safety Interlock is a safety
requirement for some laser systems. When PIN 4 is functional any logic HIGH
transition on PIN 4 halts lasing. PIN 4 is internally pulled HIGH with a 10k
resistor R40. The Safety Interlock is only functional in the Safe CDRH mode
(PIN 6 LOW).
PIN 5
Analog Voltage Control (AVC) input enable line. The AVC input is a LOW
enable. PIN 11 becomes active as a 0V DC to 5V DC analog PWM control line.
See definition of PIN 11 for AVC mode of operation. When PIN 5 is pulled
HIGH (internal 10kl pull up resistor R39), lasing is controlled exclusively by the
logical result of Gate (PIN 7) AND Gate-2 (PIN 10).
PIN 6
Safe CDRH mode LOW enable input line. The Key Switch (PIN 3) and the
Safety Interlock (PIN 4) becomes active. When PIN 6 is pulled HIGH (internal
10k pull up resistor R38) these two safety devices are disabled. Operation with
PIN 6 disable
(HIGH) is generally referred to as the “OEM mode”.
