User's Manual

BT-GPRS-S
Installation Guide – Preliminary Wireless Data Modem
Rev A | Feb 2003, © BlueTree Wireless Data, Inc. Page 3 of 15
Data Connection
The BT-GPRS-S is configured as DCE (Data Communications
Equipment) and uses the standard RS232 9-pin designations.
Two RS232 serial ports are available, each with a DB9 female
connector:
MAIN – Port 1: connects to a data terminal such as a
computer, RTU, etc.
AUX – Port 2: intended for field diagnostics and future
consideration.
Both Port 1 and Port 2 support speeds from 9600 bps up to
115.2 kbps.
RS-232 voltage levels
Table 1 RS-232 Serial Port Pin Designation
Pin Name Description Port 1 Port 2
1
DCD Data Carrier
Detect
Out X
2
RXD Receive Data Out Out
3
TXD Transmit Data In In
4
DTR Data Terminal
Ready
In X
5
GND Ground Common X
6
DSR Data Set Ready Out X
7
RTS Request To Send In In
8
CTS Clear To Send Out Out
9
RI Ring Indicator Out X
How to install the data cable
To install the serial data cable between the modem and your
computer, connect the male DB9 end of the cable to the BT-
GPRS-S and tighten the screws. The other end of the cable
connects to the communications port of the computer.
The maximum length of a standard RS232 cable is 25 feet. If
longer cable runs are required a special low loss cable can be
used.
LED Status Indicators
Table 2 The LED Indicators
LED Color Scheme Corresponding state
DTR Red Data Terminal Ready detected
TX Red Transmitting data
RX Red Receiving data
COV Red Coverage indicator (GPRS or GSM)
Off No power
Red Flashing 2Hz Channel scanning
Red Flashing 0.5Hz In-coverage
PWR
Red Registered