8. Connectors
8.1 TTL Input Connector
This connector is used to enable/disable each source and select between the GRN/YEL excitation filter.
DB15HD connector Pin Definitions
8.2 RS-232 Connector
This port conforms to standard RS-232 Interface Protocol.
DB9 Connector Pin Definitions
8.3 Dosimeter Connector (Monitor)
This connector is a standard BNC connector located on the rear panel. It is used to read the internal dosimeter
by connecting to a scope or frequency counter. It outputs a square wave, 0-5V, frequency is proportional to the
power of the light being measured.
SPECTRA, SPECTRA S and SPECTRA X Instruction Manual
12
Pins
Definition
DC Characteristics
1, 2, 3, 4, 6, 7, 8
DCD, RXD, TXD, DTR, D3R, RTS,
CTS
VCC = 5.0V,
V
ilow
(max) = 0.8V, V
ihigh
(min) = 2.4V,
I
ilow
= 0.5mA, I
ihigh
= 1.0
μ
A
5
Gnd
9
N/C
Pins
Definition
DC Characteristics
1, 2, 3, 11, 12, 13
Red, Green, Cyan, Teal, Blue, UV
respectively - low true enables
VCC = 5.0V,
V
ilow
(max) = 1.5V, V
ihigh
(min) = 3.3V,
I
ilow
= 0.5mA, I
ihigh
= 1.0
μ
A
15 - Green/Yellow
Excitation Filter Select,
V
in
= H => Green, V
in
= L => Yellow
VCC = 5.0V,
V
ilow
(max) = 1.5V, V
ihigh
(min) = 3.3V,
I
ilow
= 0.5mA, I
ihigh
= 1.0
μ
A
6, 7, 8, 10
Gnd
4, 9, 14
N/C