MDS 05-2415A01, Rev. A GENERAL 1-9
Diagnostics & Programming Interface (through INTERFACE connector)
Signaling Standard: RS-232C Interface
Connector: DB-25
I/O Devices: • MDS Hand-Held Terminal
• IBM PC or compatible computer with CGA,
EGA, VGA or Hercules Graphics™,
DOS 2.0 or later and 640K of memory.
System Data Characteristics (through
INTERFACE connector)
Signals: without modem
Transmit Audio Input
Filtered Receiver Audio Output
Receiver Unsquelched Sensor (RUS)
Received Signal Strength Indicator (RSSI)
Out-of-Lock Alarm
PTT/PTT
added with internal modem
RS-232 Compatible Data Lines
RXD TXD
RTS CTS
DCD DSR
ETC* TC*
RC*
* w/synchronous FSK only
Data Rates—
AFSK: 50 to 9600 bps—Asynchronous audio
interface using external modems
30 to 1200 bps—Asynchronous w/internal
Bell 202T compatible modem
FSK: 50 to 4800 bps—Asynchronous, w/internal
direct FSK interface
4800 bps—Async/Synchronous, w/internal
direct FSK interface
9600 bps—Async/Synchronous, w/internal
direct FSK interface
Data Turn-Around Time: 10 ms, including RTS/CTS time delay with
internal modem installed
CTS Delay: 5 to 255 ms,
Programmable in 1 ms increments
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