Linkway S2 modem
C-32
C.9 Linkway S2 modem
C.9.1 Protocols and interfaces
The following sections describe the protocol and interface between the ACU and a
LinkWay S2 modem.
Connections
Connect the ACU and Linkway S2 modem with the following cables:
• RS-232 console cable for control communication
• 75 Ohm RF cables F-F connectors for rx and tx frequencies.
Figure C-26: Connecting LinkWay S2 modem to the ACU
Figure C-27: Serial cable between the modem and the ACU
Modem signal
The $TTD command is sent by the modem to the ACU every second. The format is as
follows:
$TTD, Eb/No, RB_Detected, RB_Detected_With_No_CRC, Rx_Synced, Tx_Synced,
RB_Power,0*
TXD2
GND
RDX2
1
6
5
9
1
6
RS-232 #1
(DB-9 Connector on
Interconnect Cable)
Terminal Console
(RJ-11 Connector on
Interconnect Cable)
ACU
Modem
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