CHAPTER 3: SETTING UP COMMUNICATION CARDS
D400 SUBSTATION GATEWAY INSTRUCTION MANUAL GE INFORMATION 45
• Pulse Width Code IRIG-B (TTL) through a terminal block TB1
(TTL) input accepts B00X and B22x, 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 number 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 47.
• RS-232 Adapter (GE Item No. 520-0207LF). See “IRIG-B input adapter” on page 44.
See “IRIG-B connections” on page 63 for wiring instructions.
Configuration options
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
.
Factory default
The factory default setting is the Standard state on each channel.
Switch SW1 configuration
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 11: IRIG-B Input Card Switch SW1 Settings
Leave switch SW1 in the Standard position as it is required for the D400 to properly decode
and set the system time.
J2 Input Range 4.0 V
P-P
to 8.0 V
P-P
; No DC offset
Input Impedance >1 MΩ @ 1 kHz
TB1 Voltage Range High: > 3.5 V
Low: < 1.5 V
Load One HCMOS load
U12 Receiver Sensitivity −25.4 dBm
IRIG-B State Option SW1 Switch Positions
12
Standard (default) ON OFF
Fiber TX Continuous Test Mode OFF ON
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