RIO Remote I/O System User Guide
Installing a Long Distance Module (LDM)
Page 184
Chapter 2 Installing hardware and software
LDM Cabling information
This section contains cabling information for ins talling Long Distance Modules.
LDU flying lead connector pinouts
Cable diagram

Mini DIN on RIO link flying lead

Note
For modem installations, a converter cable must be used to connect the LDU DB25 fl ying
lead to the modem. See Asynchronous/Synchronous Modem & X21bis (DB25
female to DB25 male) on page 187.
On long-wire installations, you can connect the long wire directly to the DB2 5 flying lead.
See Asynchronous Long-wire Connection (DB25 male to DB25 male) on
page 186.
For X.21 Synchronous connections, you need to use a converter cable to co nnect the DB25
flying lead to the X21 interface. See Synchronous X.21 connection on page 188.
PIn Signal Description PIn Signal Description
1GND Ground 5RXD+ Receive Data
2VCC Supply Voltage 6TXD+ Tran smit Data
3RXD- Inverse RXD
4TXD- Inverse TXD
12
3
4
56113
1425