Figure 3-3. Rs-422 And Mil-Std-188-114 Block Diagram - Comtech EF Data SDM-650B Installation And Operation Manual

Configuration
Electrical characteristics of the RS-422 interface signals are defined in EIA-STD-RS-422.
Electrical characteristics of the MIL-STD-188-114 interface signals are defined in
MIL-STD-188-114 and MIL-STD-188-100.
•
•
•
SCT
TX CLOCK
M
TX DATA
O
D
RX CLOCK
E
M
RX DATA
COMMON EQUIPMENT
MODULATOR
DEMODULATOR
DATA BUS TO M & C

Figure 3-3. RS-422 and MIL-STD-188-114 Block Diagram

3–8
EIA-STD-RS-449 provides details of the mechanical interface.
MIL-STD-188-114 defines signal levels, offsets, termination resistors, etc.
MIL-STD-188-100 specifies such characteristics as signal quality and clock/data
phase relationships.
LOOP TIMING
TO BUFFER
TO LOGIC CONTROL
OPTIONS
JP12
JP1
AUTO
CLOCK
SELECT
JP2
JP8
INVERT
NORM
JP3
TO BUFFER
OPTIONS
FAULT
RELAYS
CONTROL
LOOPBACK
TO CONTROL LOGIC
EXTERNAL BUFFER CLOCK
RTS TO CTS JUMPER
LOGIC
SDM-650B Satellite Modem
INT/EXT CLOCK
TO CONTROL LOGIC
ST
TT
RT
SD
RD
MC
CS
JP9
RS
SPARE (RS-232 ONLY)
TTL MODULATOR FAULT
TTL DEMODULATOR FAULT
T
E
R
R
E
S
T
R
I
A
L
Rev. 5