16
MDS TransNET I&O Guide
MDS 05-2708A01, Rev. D
Typical RS/EIA-232 applications require the use of Pin 2 (receive
data—RXD and Pin 3 (transmit data—TXD). Some systems may require the
use of Pin 7 (Request-to-send—RTS).
Figure 13
shows connection details for
the
DATA
connector for EIA/RS-232 and EIA/RS-485, respectively.
If hardware flow control is desired, Pin 7 (RTS) and Pin 8 (CTS) may also be
connected. A more detailed discussion of pin functions is provided in
see
“Data Interface Connections (DB-9F)” on page 69
.
Invisible
place
holder
Figure 12. DATA Connector Pin Functions, EIA/RS-232 Mode
As viewed from outside the radio
NOTE:
The data cabling between the transceiver and the connected device should be
kept as short as possible. For EIA/RS-232 operation, the maximum recom-
mended cable length is 50 feet/15 meters.
Invisible
place
holder
Figure 13. DATA Connector Pin Functions, EIA/RS-485 Mode
As viewed from outside the radio
4. Measure and install the primary power for the transceiver. It must be
within 6–30 Vdc (including transients) and be capable of providing 7.5
watts over this voltage range. (Typical current draw is 400 mA
@13.8 Vdc; 0.9 A @6 Vdc.) A power connector with screw-terminals is
provided with each unit. Strip the wire leads to 0.25˝/6 mm. Be sure to
observe proper polarity. The left pin is the positive input; the right is
negative. (See
Figure 14
.)
5
9
6
1
Pin Function
1.....Data Carrier Detect (DCD)
2.....Receive Data (RXD)
3.....Transmit Data (TXD)
4.....Sleep (GND = Sleep)
5.....Signal Ground (GND)
6.....Alarm Output (+5/-5 Vdc)
7.....Ready-to-Send (RTS)
8.....Clear-to-Send (CTS)
9.....Reserved for Special Uses (Do not connect)
Pin Function
1.....Not Used (Open)
2.....TXD+/TXA, Non-inverted driver output.
Supplies data to connected device.
3.....RXD+/RXA, Non-inverted receiver input.
Accepts data from the connected device.
4.....Sleep Mode Input (GND = Sleep)
5.....Signal Ground (GND)
6.....Not Used (Open)
7.....RXD–/RXB, Inverting receiver input
8.....TXD–/TXB, Inverting driver output
9.....Not Connected (User configureable via internal jumper)
5
9
6
1
