Specifications

Diamond™ GEM, G, & K, Integrator’s Guide
36
Table 5. Signal Interface Description and Connector Pinout for GEM-25/50/60/100/200
PIN NO. FUNCTION DESCRIPTION
1 RS-423 MODULATION
Input signal (unbalanced)
The RS-423 specification requires a driver capable of delivering a
signal between 4 V and 6 V into a test load of 450 Ω.
2(+)
and
3(–)
MODULATION
Differential input signal
(RS-422)
The RS-422 balanced specification requires a driver that is capable of
developing a differential signal between 2 V and 10 V into a load of
100 Ω.
4 ANALOG FORWARD
Voltage output signal
Analog representation of the RF power supply’s forward RF output
voltage. 0V to 5V, 5V = full scale. Signal will drive ≥10 kΩ load. A
voltage level lower than 2.5 V indicates a bad RF power supply. See
representative signal curves for the particular GEM-series RF power
supply.
5 ANALOG REFLECTED
Voltage output signal
Analog representation of the RF power supply’s reflected RF output
voltage. 0V to 5V, 5V = full scale. Signal will drive ≥10 kΩ load. A
voltage level greater than 1.0 V may indicate either a bad laser head,
a bad RF cable, or both.
6 VSWR Fault
Open collector output
Will sink 25 mA of current when an VSWR fault occurs. This indi-
cates an excessive mismatch between the laser head and the RF power
supply.
7 – Not currently used.
8 VDC
Voltage output signal
+15 VDC ± 0.5 VDC, 0.25 amp max output available from RF power
supply to user equipment.
9 GND
Ground
Customer ground. Return line for all signals. Is also chassis ground.
10 Power Supply Enable
TTL input signal
Enables internal DC power supply. TTL high will enable this pin.
11 MODULATION SELECT
Input signal
Selects between unbalanced TTL modulation or Differential modula-
tion signal. No connection selects unbalanced input (Pins 1 and 9).
Ground this pin to selected balance inputs (Pins 2 and 3).
12 OVER TEMPERATURE
Open collector output
Will sink 25 mA of current when an OVER TEMPERATURE fault
occurs. This indicates that the RF power supply has gone over temper-
ature.
13 DUTY CYCLE FAULT
Open collector output
Will sink 25 mA of current when a DUTY CYCLE FAULT error
occurs. This indicates a duty cycle exceeding 50% when the RF power
supply is set to the Enhanced Pulse Mode. Fault automatically reset
when fault condition is removed.
14 – Not currently used.
15 MODE CONTROL
Input signal
Selects between CW Mode or Enhanced Pulse Mode.
0V to 7V = CW Mode
7.2 V to 10 V = Enhanced Pulse Mode