Mini Usb Interface - GE MDS Master Station Technical Manual

Table 6-7. COM2 Pin Descriptions—Radio in RS-232 Mode
Number
1
2
3
4
5
6
7
8
COM2 RS-485 and RS-422 Wiring Arrangement
- RXD+ / RXB and RXD– / RXA are data received by the radio and transmitted
- RXD+ / RXB is positive with respect to RXD– / RXA when the line input is a "0"
- TXD+ / TXB and TXD– / TXA are data sent to the radio to be transmitted
- TXD+ / TXB is positive with respect to the TXD– / TXA when the line output is a "0"

Mini USB Interface

The USB Interface follows standard Mini-USB wiring and protocol. This interface can be used
to access a command line user interface when connected to a computer USB port and the GE
provided driver is installed. Refer to "Mini USB" on Page 23 for more information.
84
Pin Radio
Pin Description
Input/
Output
--
Reserved—Do not connect
--
Reserved—Do not connect
--
Reserved—Do not connect
-
Ground—Connects to ground (negative supply potential) on
the radio's PC board.
IN
TXD+/TXB (Transmitted Data +)— Non-inverting receiver
input
OUT
RXD+/RXB (Received Data +)—Non-inverting driver output.
IN
TXD-/TXA (Transmitted Data -)— Inverting receiver input
OUT
RXD-/RXA (Received Data -)— Inverting driver output.
Table 6-9. EIA-422 4-Wire Connections
External DB-9
TXD-
RXD-
RXD+
TXD+
Table 6-10. EIA-485 2-Wire Connections
External DB-9
TXD-
RXD-
RXD+
TXD+
MDS™ Master Station
COM2
2 7 TXD-
3 8 RXD-
7 6 RXD+
8 5 TRD+
COM2
2
RXD-/TXD-
3
7
RXD+/TXD+
8
MDS 05-6399A01, Rev. E