Rockwell Automation 1770-HT8 SMART TRANSMITTER - Manual (Page 48)

Installing the Smart Transmitter Interface
Products
Chapter 2
2-23
Figure 2.20
RIO Connector
90014
POWER
RIO
Twinaxial Cable (1770-CD)
Blue
Clear
Shield
1 SH 2
RIO
The pinout is:
Signal Label Cable
A1 1 Blue wire
A2 SH Shield
A3 2 Clear wire
Use Twinaxial Cable (1770-CD) for the RIO connections. Maximum
length for the cable depends on the baud rate:
For this baud rate: Maximum cable length is:
57600 10,000 feet (3,048 m)
115200 5,000 feet (1,524 m)
230400 2,500 feet (762 m)
Termination
Terminate the farthest physical nodes on the RIO link with a 150 or 82
Ohm termination resistor. If the Communications Controller is the last
device on the RIO link, connect a 1/2 watt resistor across pins 1 and 2 of
the plug. The value of the resistor depends on the Remote I/O baud rate:
For this baud rate: Use this terminating resistor: AllenĆBradley Part Number
57600 150W #740018Ć29
115200 150W #740018Ć29
230400 82W #740018Ć23