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A Trimble Standard Interface Protocol
74 Trimble ThunderBolt E GPS Disciplined Clock User Guide
Command Packet 8E-A9 Data Format
Command Packet 0x8E-AB: Request Primary Timing Packet
Use command packet 0x8E-AB to request the Primary Timing packet 0x8F-AB. By
default, the receiver automatically sends packet 0x8F-AB once per second so it is not
necessary to request it. To receive 0x8F-AB information by request only, use packet
0x8E-A5 to disable the automatic output.
The Request Type item determines how the receiver will reply to this command:
Command Packet 0x8E-AB Data Format
Byte Item Type Value Description
0Subcode UINT80xA9
1 Self-Survey Enable UINT8 0
1
Disabled
Enabled
2 Position Save Flag UINT8 0
1
Don't save position
Save self-surveyed position at the end of
the survey
3-6 Self-Survey Length UINT32 see above Number of fixes
7-10 Reserved UINT32 0 0
Type Description
0 The most current primary timing values will be sent in packet 0x8F-AB immediately.
1 The response is not sent immediately. Instead packet 0x8F-AB is sent after the next
PPS output. This is the same time that the packet would be automatically sent if
enabled.
2 Same as type 1 except that both 0x8F-AB and 0x8F-AC are sent after the next PPS
output.
Byte Item Type Value Meaning
0 Subcode UINT8 0xAB
1 Request type UINT8 0 Send 0x8F-AB immediately
1 Send 0x8F-AB on-time next second
2 Send 0x8F-AB and 0x8F-AC on-time next
second