GE MDS DS-EL805 Users Manual

MDS TransNET 900 Transceiver

ADDENDUM

Addendum to MDS 05-2708A01, Rev. A April 19, 2002

Microwave Data Systems Inc., 175 Science Parkway, Rochester, NY 14620 U.S.A.

General Business [phone], FAX [phone]

This addendum contains corrections and additions to the MDS TransNET 900 Installation Guide (MDS P/N 05­2708A01, Rev. A) published in March 2002. The Bolded text below indicates new or revised material. You may
wish to make these pen & ink changes directly to your manual or include a reference to this addendum in the
appropriate sections.

ITEM 1—Command Changes

Page 19, Data Buffer Setting: Default setting is OFF.
Page 25,
Page 26,
Page 28,

Page 30,
Page 31,

BUFF [ON, OFF]: Default setting is OFF.
CTSHOLD [0-6000]: Should read CTSHOLD [0-60000].
RSSI description: Change reference to minimum output range from “-50 dBm” to “-40 dBm.”

SKIP [NONE, 1…8] description: Delete text reference to “128 frequency.”
TX [xxxx] description: Default Transmit Frequencies are Master—902.200 MHz, Remote—927.800

MHz.

ITEM 2—Table 8. Alarm Codes, Page 34

For Alarm Code 30, delete second sentence that reads “Bit errors are likely to be present in the data.”

ITEM 3—Internal Fuse Replacement, Page 35

Reverse polarity will not cause the fuse to blow.

ITEM 4—Technical Specifications, Page 38

Change Temperature Range from “-30C to +60C” to “-40 to +70C.”
Change Current Draw (Receive) rating from “125 mA @ 13.8 Vdc” to “100 mA @ 13.8 Vdc.”
Delete “TTL/” reference.
Change Data Latency from “10 ms typical” to “7 ms typical.”

ITEM 5—Table 10. Data connector pin descriptions—RS/EIA-232, Page 40

Delete entire text description for Pin 9 and replace with “Not Used.”

ITEM 6— Table 11. Data connector pin descriptions—RS/EIA-232, Page 41

Change table title to “Data connector pin descriptions—RS/EIA-485.”
In Pin 2 description, change heading from “RXD/Y” to “RXD/+.” Also, replace the words “Non-inverted driver

output” with “non-inverted receive data.”
In Pin 3 description, change heading from “TXD/A” to “TXD/+.” Also, replace the words “Non-inverted receiver

input” with “non-inverted transmit data”

MDS 05-2708A01, Rev. A Page 1 of 2

In Pin 7 description, change heading from “RTS/B—Request-to-Send” to “TXD/-.” Also, replace the words
“Inverted receiver input” with “Inverted transmit data.”

In Pin 8 description, change heading from “CTS/Z—Clear-to-Send” to “RXD/-.” Also, delete all descriptive text
and replace with “Inverted receive data.”

ITEM 7— New PORT Command

The transceiver’s DATA port configuration (RS-232 or RS-485) may be read by entering the PORT command. The
port may be configured for RS-232 or RS-485 operation using the following commands:

PORT RS232—RS-232 operation
PORT RS485—RS-485 operation

ITEM 8— Wiring for RS-485 systems

When wiring the transceiver’s DATA connector for RS-485 2-wire or 4-wire operation, use one of the following
arrangements :

2-WIRE CONNECTIONS

2
3

7

8

RX/TX+

RX/TX-

DATA CONNECTOR

4-WIRE CONNECTIONS

2
3

7

8

RXD/+
RXD/-

TXD/+
TXD/-

DATA CONNECTOR

ITEM 9— Antenna & Feedline Selection, Page 9

Currently, the transceiver is only authorized for use in the USA with an MDS Clearwave antenna, Part Number
97-3662A13 and a 3-meter feedline. Check with MDS for the status on additional approvals that are pending.

End of Document

Page 2 of 2 MDS 05-2708A01, Rev. A