Rs-422/rs-485 port, Troubleshooting, Check for adequate power – Rockwell Automation 2711C-xxxx PanelView Component HMI Terminals Installation Instructions User Manual
Page 26
26 PanelView Component HMI Terminals
Publication 2711C-IN001H-EN-P - July 2014
RS-422/RS-485 Port
The RS-422/RS-485 port is a nonisolated port that supports point-to-point communications using
Full-Duplex or Half-Duplex mode
•
In Full-Duplex mode, both devices can transmit and receive simultaneously.
The transmit and receive pair are wired individually.
•
In Half-Duplex mode, only one device can transmit at a time while the other device receives. A
single differential, twisted pair connects to both receive and transmit pairs (R and T and on one
wire, R- and T- on the other).
The RS422/485 port has integrated 121 ohm termination between the R and R- signal pair. This value is
compatible with RS422 and RS485 electrical specifications. Additional termination on the PanelView
Component end of communication cables is not required.
Troubleshooting
If your terminal does not start up correctly, check for adequate power and indicator states during powerup.
Check for Adequate Power
A terminal that does not receive adequate power could cause unpredictable behavior.
Verify the power requirements in the Specifications table.
1747-CP3
Serial 9-pin D-shell to 9-pin D-shell null modem cable
C200, C300, C400, C600, C1000
1761-CBL-PM02
Serial 9-pin D-shell to 8-pin mini DIN cable,
2 m (6.56 ft)
C200, C300, C400, C600, C1000
2711C-CBL-AB03
RS-485 5-pin to RJ45 cable
C200, C300, C600, C1000
RS-422/RS-485 Connector Pinout
Pin
Signal
1
T
2
T–
3
R
4
R–
5 S
(Shield)
Cables for PanelView Component Terminals
Cat. No.
Description
For Use With