User's Manual

Table Of Contents
70 MDS TransNET I&O Guide MDS 05-2708A01, Rev. D
Pin Descriptions—RS/EIA-232 Mode
Table 27 lists the DATA connector pin functions for radios configured to
operate in RS/EIA-232 mode.
NOTE: The radio is hard-wired as a DCE in the EIA-232 mode.
Table 27. DATA connector pin descriptions—RS/EIA-232
Pin
Number
Input/
Output Pin Description
1 OUT DCD (Data Carrier Detect)
A “high” indicates hopping synchronization.
2 OUT RXD (Received Data)
Supplies received data to the connected device.
3INTXD (Transmitted Data)
Accepts TX data from the connected device.
4INSleep—A ground on this pin turns off most circuits in a Re-
mote radio, including transmit, receive, modem, and diag-
nostic functions. This allows for greatly reduced power
consumption, yet preserves the radio’s ability to be quickly
brought on line. See “Using the Radio’s Sleep Mode (Re-
mote Units Only)” on Page 59 for details.
5INSignal Ground—
Connects to ground (negative supply potential) on the ra-
dio’s PC board and chassis.
6 OUT Alarm Output—An RS-232 high/space (+5.0 Vdc) on this
pin indicates an alarm condition. An RS-232 low/mark
(–5.0 Vdc) indicates normal operation. This pin may be used
as an alarm output. (See ASENSE [HI/LO] Details, page
29 for further information.)
7INRTS (Request-to-Send)
8 OUT CTS (Clear-to-Send)—Goes “high” after the programmed
CTS delay time has elapsed (DCE), or keys an attached ra-
dio when RF data arrives (CTS KEY).
9--Reserved for Special Uses (Do not connect)