MDS 05-6628A01, Rev. B
MDS Orbit MCR-4G Technical Manual
7
COM1 Port notes and wiring arrangements (RS-485):
The COM1 port supports 4-wire and 2-wire RS-485 mode.
·
RXD+ / RXB and RXD– / RXA are data sent
into
the unit
·
RXD+ / RXB is positive with respect to RXD– / RXA when the line input is a “0”
·
TXD+ / TXB and TXD– / TXA are data sent
out
by the unit
·
TXD+ / TXB is positive with respect to the TXD– / TXA when the line output is a “0”
Cell Antennas (
AUX
and
MAIN
)
—These SMA coaxial connectors are for attachment of cellular antennas.
The MAIN connection is for basic cellular transmission/reception, and the AUX connector is for attachment
of a receive-only antenna which provides for MIMO receive operation (diversity) with standard for 4G mod-
ules, improving signal quality in many installations. In general, both antennas should always be used for
cellular operation. The GE MDS part number for this antenna type is 97-2485A04.
Figure 5. Directly-Connected Cellular Antenna (Typical)
(
GE MDS Part No. 97-2485A04)
Table 3. COM1 Port Pin Details (RS-485)
Pin
Number
Input/Output
Pin Description
1
Reserved
2
OUT
DCD (Data Carrier Detect)
3
Reserved
4
Ground
Connects to ground (negative supply potential) on chassis
5
OUT
TXD+ (Transmitted Data +)—Non-inverting driver output. Supplies
received payload data to the connected device.
6
IN
RXD+ (Received Data +)— Non-inverting receiver input. Accepts
payload data from the connected device.
7
OUT
TXD-/TXB (Transmitted Data -)—Inverting driver output
8
IN
RXD-/RXB (Received Data -)— Inverting receiver input
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