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ETM8100 Series Quick Start GuideV002
Power & Serial Connector, RJ45
The ETM8xxx-xxx modems utilise a single RJ45 socket (or plug for -4 versions) for connection of
serial interface and power.
The RS232 Port is the primary interface for the application software and connection to external
devices. ET/AT commands are used to communicate with the terminal.
Pin
Function
Looking at Modem Socket
ETM8xxx-1
Looking at RJ45 Plug
ETM8xxx-4
(Hook underneath)
1 Power
Supply
(+4 to +35VDC)
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
2 DCD
3 DTR
4 GND
5 RX
6 TX
7 CTS
8 RTS
RJ45/DB9F/Flying Lead Adaptor Cable
The following adaptor cable is available from ETM for ease of connection to the modem when
programming and testing.
Adaptor Cable for Programming ETM8xxx-xxx Modems
White/red po4 to 35VDC blue/black Negative/Gnd
ERNI 6 Pin Minibridge I/O Connector (if fitted)
If fitted 4 x I/O’s configurable as digital, analogue or pulse are available on the ERNI 6 Pin
Minibridge IO connector, pin allocations are as shown below.
Pin
Function
Looking at Modem Socket
1 to 4
Configurable as:
◩
Digital Input: LL<0.5V, HL>2.5V, Max Input 50VDC
◩
Digital Output: LL0V, HL3V,0.1mA
◩
Pulse Input (I/O9): LL<0.5V, HL>2.5V, Max Input 50VDC
◩
Analogue Input: 0-2.5VDC, Max Input 50VDC
ERNI 1.27mm Minibridge
Connector
5 & 6
GND
Caution
This modem has no reverse polarity protection on the power input, incorrect
connection of power may damage the modem
1 2 3 4 5 6
