C.10 Option 17: Parallel BCD Output and Second RS-232C Port 127
C.10 Option 17: Parallel BCD Output and Second RS-232C Port
C.10.1 General Description
Option 17 for the standard Model 1084A/B/C and 1088A/B clocks expand the capabilities of the
instrument to include:
• Either of the following:
a. Time-of-year output in Binary-Coded Decimal (BCD) format, with resolution down to
1 millisecond; or
b. Parallel Data output, with up to 48 bits that can be custom-configured at the factory
for specific applications;
• A continuous 1 pulse-per-second (1 PPS) output, with the rising edge of a 10 millisecond-wide
pulse synchronous to the rising edge of 1 PPS/GPS;
• A continuous 1,000 PPS (1 kPPS) square wave output, with rising edges synchronous to the
rising edge of 1 PPS/GPS;
• Four pins of the output connector that can be configured with combinations* of the following:
a. Up to four digital signal outputs, the functions of which can be selected individually
from 18 choices.
b. Up to two analog signal outputs, the functions of which can be selected individually
from two choices.
c. An RS-232C serial communications port, which can use between two and four lines.
*Note: Since these auxiliary functions must share four connector pins, certain limitations will
apply when selecting combinations:
• Enabling any one (or more) of the digital signal outputs precludes four bits from the parallel
data output, if used;
• Each analog signal output used precludes one of the digital signal outputs; if two analog signal
outputs are employed, only two digital signal outputs are possible. Also, each analog signal
output displaces one bit from the parallel data interface, if used;
• A two- or four-wire RS-232C port configuration uses two or four of the data output lines, so
these lines become unavailable for digital and/or analog signal outputs, or for the assigned
data bits of the parallel output (if used).
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