Westermo IDW-90 AT - Manual (Page 2)

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1. Introduction
The Westermo IDW-90 is an industrialised ISDN Terminal adapter. This Terminal adapter
has been developed with high speed industrial data communications in mind and has
some features you would not expect to find on normal adapters.
The unit is DIN rail mounted and has both an RS-232/V.24 and RS-485 interfaces with
2 or 4 wire connections.
Terminal data rates of up to 115.2 kbit/s can be handled with a 128 kbit/s ISDN
B-channel bit rate
The IDW-90 has been designed to meet the European ISDN standard DSS1.
All standard ISDN transport protocols are supported including HDLC transparent,
X75, PPP and ML-PPP.
V.110 asynchronous is supported with flow control at data rates up to 19.2 kbit/s.
A watchdog facility continually monitors the power supply and internal hardware as well
as the operational software. In the event of a problem the modem automatically resets.
This feature has been included to make the unit more suitable for use in unmanned
locations.
The IDW-90 is available in an LV version
The nominal input voltage is 12–48 VDC ±10%.
The IDW-90 has 1 Digital opto-coupled input that can be used to trigger services
specified in a list of service entries. The IDW-90 also has a relay output with change
over contact. The relay output can be controlled from a remote Westermo modem
(PSTN, GSM and ISDN).
The IDW-90 features DIP-switch configuration and can be programmed using
AT-commands or a Configurator which allows local and remote configuration and
CAPI 2.0 compatibility. It also has an internal analogue V.34 modem enabling connections
from ISDN to analogue modem end locations.
The IDW-90 documentation includes extensive information on the command set,
S registers, DIP-switches and error codes. Please call your local Westermo office if
you need further technical information.