Wiring The System; Terminal X53; Cable Specification; Terminators - Parker 8903/SP Technical Manual

Wiring the System

Terminal X53

Cable Specification

Terminators

Wiring Diagram

124Ω

Maximum Cable Lengths

8903/SP Peer-to-Peer Communications Option
X53 Pin Number
1
2
3
4
5
The media for the Peer-to-Peer Option is a shielded copper cable consisting of one twisted pair
and two cores for power. The recommended bus cable is specified in ISO/DIS 11898.
The twisted pair of the cable must be connected to the terminals SIG_L and SIG_H. It is
recommended to connect one of the cores for power to the terminal GND (do not connect to
safety earth). The cable shield must be connected to the terminal SCREEN on the connector
X53 at each node. Nodes should be connected in a daisy chain configuration. The cable
shield should be connected to safety earth at one point only.
Keep electrically noisy and sensitive cables apart. Pay particular attention to screening and
earthing of motor cables. Where necessary, sensitive cables should cross noisy cables at 90°
to minimise capacitive coupling.
Both nodes at the end of the trunk must have a terminating resistor. A
resistor of 124Ω (±1%, minimum ¼ watt) is recommended, but it
should be chosen to equal as closely as possible the characteristic
impedance of the cable. The terminating resistor must be connected
between the pins SIG_L and SIG_H.
All other nodes in the system should not have a terminating resistor.
X53
1
2
3
4
5
Data Rate Maximum Cable Length
1000 kbits/s 35 metres
800 kbits/s 50 metres
500 kbits/s 100 metres
250 kbits/s 250 metres
8903/SP
X53
1
2
3
4
5
Connection
GND
SIG_L
SCREEN
SIG_H
N/C
SIG_L
SIG_H
X53
1
2
3
4
5
5
124Ω
124Ω