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IRIG-B INPUT ADAPTER
IRIG-B input adapter
Configuration options
Factory default
Switch SW1 configuration
42
The IRIG-B Input Adapter (GE Item No. 520-0211LF) plugs into a dedicated IRIG-B slot (slot
9) on the D400. The IRIG-B Input card accepts an IRIG-B signal in one of three input formats
through a corresponding connector type:
•
Modulated IRIG-B through a BNC connector J2
AM modulated input accepts B12X, however, the SBS (straight binary seconds) in B120,
B124, and B127 are decoded but not used to set the time
•
Pulse Width Code IRIG-B (TTL) through a terminal block TB1
(TTL) input accepts B00X and B237, however, the SBS field is decoded but not used to
set the time. The connector used is a 2 position pluggable terminal block, Molex P/N
39530-0002 (GE Part No. 640-0956)
•
Fiber Optic through a Receive (RX) 820 to 850 nm ST connector U12
The IRIG-B signal (TTL) can be subsequently distributed to attached devices through one of
the following options:
•
IRIG-B Distribution Adapter (GE Item No. 520-0212LF). See "IRIG-B distribution adapter"
on page 44.
•
RS-232 Adapter (GE Item No. 520-0207LF). See "IRIG-B input adapter" on page 42.
See "IRIG-B connections" on page 58 for wiring instructions.
J2
Input Range
Input Impedance
TB1
Voltage Range
Load
U12
Receiver Sensitivity
The input signal formats and output options are selectable via two switches on the IRIG-B
Input card:
•
IRIG-B state option is configured by switch SW1
•
Input signal format is configured by switch SW2
Follow instructions for setting the switches to select the appropriate IRIG-B signal formats
.
and functions
The factory default setting is the Standard state on each channel.
Switch SW1 controls the state option for the IRIG-B Input card. It contains two switch
positions that can be set to ON or OFF to select the appropriate IRIG-B state option.
Table 8: IRIG-B Input Card Switch SW1 Settings
IRIG-B State Option
Standard (default)
Fiber TX Continuous Test Mode
CHAPTER 3: SETTING UP COMMUNICATION CARDS
4.0 V
to 8.0 V
P-P
>1 MΩ @ 1 kHz
High: > 3.5 V
Low: < 1.5 V
One HCMOS load
−25.4 dBm
SW1 Switch Positions
ON
OFF
GENERAL
D400 SUBSTATION GATEWAY USER'S MANUAL
; No DC offset
P-P
1
2
OFF
ON
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