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A-92 Acutime 2000 Synchronization Kit User Guide
Trimble Standard Interface Protocol
A
The default setting for byte 3 is positive. Bytes 4 to 11 define the PPS
cable delay offset. The default offset is 0, which corresponds to a 100-
foot (30-meter) cable. These bytes allow the application to adjust the
cable delay offset for longer or shorter cable lengths. Use a cable
delay of ± 1.25 ns/foot to adjust PPS offset for cable lengths different
than 100 feet. For a longer cable, a negative value should be used to
advance the PPS. ACE UTC GPS estimates the bias uncertainty as
part of a PPS validity monitor. If the bias uncertainty exceeds the
threshold, then ACE UTC GPS disables the PPS output. The default
bias uncertainty threshold is 300 meters, but this parameter may be
programmed by the application. ACE UTC GPS limits the threshold
to 3x10
8
meters. Each time the application adjusts the packet 8E-4A
settings, the new settings are stored in nonvolatile memory.
0x8E-4D
Command Packet 8E-4D
Automatic Packet Output Mask
Automatic output of packets on Port 1 can be throttled using this
command packet. The current mask can be requested by sending this
packet with no data bytes except the subcode byte. The receiver
returns packet 8F-4D.
The automatic packet output mask can be set by sending this packet
with 4 data bytes. This mask only disables automatic packet output.
Packets generated in response to TSIP set or query commands will
always be output by the receiver.
Table A-76 Command Packet 8E-4D
Byte # Item Type Meaning
0 Subcode BYTE ID for this subpacket is
always 0x4D
1-4 Auto-output
mask
LONG 32-bit packet enable
bitmap