MDS TransNET 900 Specifications download pdf (Page 80)

70 MDS TransNET Ref. Manual MDS 05-2708A01, Rev. E

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

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.

3 IN TXD (Transmitted Data)

Accepts TX data from the connected device.

4 IN Sleep—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.

5 IN Signal 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.)

7 IN RTS (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)

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 95 96

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MDS TransNET 900 Specifications Page 80