Configuration; C.12.6 Configuration - Arbiter Systems 1088A Operation Manual

142
C.12.6 Configuration
General
Case Removal
To change the configuration of Option 17, the top cover of the instrument must be removed. Turn
off the instrument, and disconnect the power cord. Using a T-25 driver, remove the four screws
holding the cover (and rack mount ears, if used) in place, and lift the cover off.
WARNING: Do not remove the top cover while power is applied. Hazardous voltages are present
while the power cord is connected. Always disconnect the unit from the input power source before
removal of the top cover.
Jumper Functions and Locations
Upon removal of the top cover, locate the circuit board for Option 17 (a diagram of the board,
showing jumper locations, is given in Figure 2). The following sections outline the jumper setting
changes and other steps necessary to utilize the various features available with Option 17.
BCD Output Mode
General
When configured for BCD output of time data, Option 17 utilizes pins 1 through 21 and 26 through
46, along with ground pins 25 and 50. The weighting for the individual bits, along with the
connector pin locations, is given in Table 1. To configure Option 17 for BCD operation, observe
the following steps:
a. Set jumper JMP1 to position "B". This enables the BCD output mode.
b. Set jumper JMP6 to position "A". This jumper is included to set the timing mode when
utilizing the parallel data output, and must be set to position "A" for the BCD output to
function properly.
Operation in the BCD output mode allows use of the analog and/or digital signal outputs, the 1
PPS and 1 kPPS outputs, and the RS-232C communications port. Refer to the appropriate sections
of this document for details of these functions.
Time Data Format
The format of the BCD time data which is output from the rear-panel connector can be either
Local time or Coordinated Universal Time (UTC), and will be the same as the time format which
is specified in the SETUP menu for the IRIG time data outputs. For further details, refer to the
flowchart titled "Set IRIG Time DATA? in the 1088B Operation manual.
Options List