User's Manual

MDS 05-6399A01, Rev. D MDS Master Station 25
Serial Data Connection
When used as a data port for an SD Radio Module in Transparent or x710 modes, some pins on COM1
and COM2 have special behavior determined by configuration. DCD (Data Carrier Detect) is asserted
when the radio received an on-frequency signal. RTS (Request-to-Send) can be configured to key the
transmitter when asserted. CTS (Clear-to-Send) can be configured to go “high” after the programmed
CTS delay time has elapsed (DCE), or can be configured to key another connected radio when RF data
arrives (CTS KEY
The included Com Port Adapter Cable 73-2434A25 can be used to convert the unit’s RJ-45 serial jack to
a DB-9F type connector.
Table 3-3 RF-45 to DB-9F Pin Out
Signal RJ-45 DB-9F Standard RS-232
DSR 1 6 DSR
DCD
2 1
DCD
DTR 3 4 DTR
Ground 4 5 Ground
RXD
5
2
RXD
TXD 6 3 TXD
CTS 7 8 CTS
RTS 8 7 RTS
No connection N.C. 9 RI
3.6.3 Mini USB
The Mini USB port can be used to management the radio through a scriptable command line interface
(CLI) using the proper USB drivers available at www.gemds.com. Connect to the management PC using
the included Mini USB Cable. Once the PC registers the device driver, the port will auto baud. The USB
port provides CLI management only and cannot be used for network diagnostics or for payload data.
3.6.4 Alarm Output and 4-Wire Audio
Alarm and audio signals are provided on the Alarm or Alarm/Relay module. Refer to 6.5.1 Alarm Module
LEDs for details on pinout and signal descriptions. Audio signaling and alarm outputs are software
configurable. Refer to Section 5 Device Management for more information.