RIO Remote I/O System User Guide
Installing a Long Distance Module (LDM)
Page 179
Chapter 2 Installing hardware and software
Installation

General procedure

To install a long distance module proceed as follows;
1. On the LDU, set the speed and protocol you want by setting the rotary switch on each
LDU (shown on page 178) using a small screwdriver. The settings available are shown in
the next table.
2. Install the type of LDU link you want. For Modem via telephone line see page 18 0, for
long wire see page 180 and f or X.21 see page 180.
Note
For modem installations, you need to use a converter cable to connect the LDU DB25 flying lead to the
modem. On long-wire installations, the long-wire you can connect direct ly to the DB25 flying lead.
For information on how to wire up the converters needed for each typ e of installation see Adaptor pinouts
for LDU flying lead connectors on page 186.
Device Line Speed Transmission type Use switch
setting
Modem 9600 Asynchronous 0
Modem 19200 Asynchronous 1
Modem 38400 Asynchronous 2
Reserved address, do not use 3
Reserved address, do not use 4
Long wire 78000 Asynchronous 5
Long wire 156250 Asynchronous 6
Long wire 312500 Asynchronous 7
Modem Synchronous 8
X21 bis Synchronous 9
X21 Synchronous A
Reserved address, do not use B
Modem with Autodial 9600 Asynchronous C
Modem with Autodial 19200 Asynchronous D
Modem with Autodial 38400 Asynchronous E
Reserved address, do not use F