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Operations Manual, HPA2, Compact Outdoor SSPA 205486 REV F 119
VSAT BUC protocol support
In order to provide seamless integration with the legacy SierraCom VSAT BUC product line,
compatible serial protocol was introduced to the CO SSPA protocol selection. This protocol is
supported in I/O board firmware version 3.50 or better. In order to enable SierraCom protocol,
connect to a SSPA unit over Standard String Protocol. Select the relevant option from System
Settings Table 10-6 (data address 16). Cycle SSPA power. After power-up, unit will come up
with new protocol selection.
Protocol Description
This manual provides only a short description of the VSAT BUC serial protocol, and covers
common compatibility issues. For a full protocol description, refer to Paradise Datacom LLC
document number 201410.
Serial Data Format
The serial data format is listed below. The SSPA should respond to any command within 50
msec. If there is no response in that time, the host computer should repeat the command.
Baud Rate 9600 bps
Data Bits 8
Parity none
Stop Bits 1
Message Rate 1 every 40 msec
BUC Response Time 12 msec, typical
Maximum Response Time 40 msec
Power Up State
Original VSAT BUCs utilized one of two power-up modes: RF ON and RF OFF. The CO
SSPA works differently – it powers up using the last saved state. In order to make the CO
SSPA power up behavior similar to that of a VSAT BUC, extra functions were added to the
Auxiliary I/O. To decouple CO SSPA style muting, an additional wire jumper between pins G
and B has to be installed on the M&C connector, J5. Auxiliary logic has to be altered as well.
See Table 10-6 Data Address 12. Select Startup in Low Z State for power up with RF ON
state and Startup in High Z State for RF OFF power up. If Auxiliary logic is set to normal
Auxiliary fault operation (Ignore, Logic Low, Logic High), the CO SSPA muting schema will be
implemented and Aux fault becomes available for system usage.
Connection Signal description
B-G Wire Jumper, Mute Control
E-F Wire Jumper, to RS485 Data - line
T-U Wire Jumper, to RS485 Data + line
V Signal Ground (optional)
Table D-1: Suggested Cable Wiring for ND Satcom SkyWAN modems
Appendix D: VSAT BUC Protocol Support