Perle Systems RIO 5500036-17 - Manual (Page 220)

RIO Remote I/O System User Guide
RIO cables available from Perle
Page 220
Chapter 3 RIO Cabling information
Link cable specification
RIO link cables should conform to the following specification:
Item Specification
Size 7/0.2 minimum
Type Two individually screened twisted pairs with drain and overall screen,
sheathed over all in grey PVC (or PTFE). The screen is aluminised
polyester tape. The drain wire is tinned. For particularly noisy
environments and distances greater than 5 metres we recommend an
additional overall braid screen
Length 5.0 metres maximum
Noise The receiver does not require a differential input voltage more than 200mV to
correctly assume the binary state over an entire common-mode voltage range
of -7V to +7V. Thus, noise must not reach more than +/-7V.
Nominal Impedance 100 Ohms
Ground Potential The maximum voltage between either receiver input and receive ground
must not exceed 8V (80% - 3V signal + 7V common mode voltage) in
magnitude. Thus excessive differences in 0V between communication
devices (systems) are unacceptable. Typical causes are insufficient
mains earthing, heavily laden mains, or heavily laden PC slots