TM 11-5820-890-30-4
12-15. FILL OPERATION. Continued
The fill I/O bus In the fill routing module is configured to receive a COMSEC variable when the fill request is
received over the asynchronous link. The fill I/O bus level shifts the logic levels of 0 V dc and -6.75 V dc used by
the fill device to the logic 0) and logic 1 levels used by the RCU.
A fill request Is Issued to the fill device over the PIT-N/REQ-N line after the fill I/O bus is configured. The fill device
responds by outputting a COMSEC variable over the FILL INFO line. The fill device also outputs a clock on the FILL
l/A line, which Is used by the fill routing CPU to clock in the COMSEC variable,
The fill routing CPU performs a COMSEC variable parity check on the clocked FILL INFO to ensure it is valid. If the
variable does not have valid parity, a bad parity code is issued to the control module (via the asynchronous link),
and BAD is displayed. If the variable has valid parity, a good parity code is issued to the control module, and
HTEK is displayed.
The control module issues a COMSEC variable select code to the fill routing module after STO and one of the 1 - 6
number keys are pressed. The fill routing module selects the appropriate variable location using the VS 1 - 5
lines.
The LO-N and COMSEC PTT-N lines are both set to a logic 0 by the fill routing module after the variable location
has been selected. This causes the COMSEC module to issue a fill request on the FILL REQ OUT line. The fill
routing module sends the variable over the FILL DATA-N line after the request has been received. The fill routing
module also outputs a clock on the FILL CLK-N line, which clocks the variable into the COMSEC module.
The COMSEC module indicates successful reception over the A TONE line. The fill routing module monitors this
line and issues a COMSEC fill done code to the control module if the fill is successful, and a COMSEC fill bad code
if the fill is unsuccessful. The STO n display is blinked after a successful fill. If the fill is unsuccessful, BAD is
displayed.
Section Il. REPAIR PARTS, SPECIAL TOOLS, TMDE,
AND SUPPORT EQUIPMENT
Subject
Para
Page
Common Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-16
12-22
Special Tools, TMDE, and Support Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-17
12-22
Repair Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-18
12-22
12-16. COMMON TOOLS AND EQUIPMENT.
For authorized common tools and equipment, refer to the Modified Table of Organization and Equipment (MTOE)
applicable to your unit.
12-17. SPECIAL TOOLS, TMDE, AND SUPPORT EQUIPMENT.
For the TMDE and support equipment required for DS, see the maintenance allocation chart. It is Appendix Bin
TM 11-5820-890-20-1.
12-18. REPAIR PARTS.
Repair parts are listed and illustrated In the repair parts and special tools list (TM 11-5820-890-30P-1) covering
DS maintenance for this equipment.
12-22
