Rev. C
9-7
HMXMU001018
10/06
9.5.3
RS-232 and RS-422/485 cable
The EIA RS-232 standard is an unbalanced signal transmission standard. This means
that the data signal levels (+10v or -10v DC) are inserted and measured with respect to
a single SIGNAL-GROUND wire, common to both the receive and transmit data wires.
This limits the distance over which it can reliably be used (approx. 30m at 19.2Kb on
100pF/m cable). Although lower capacitance cables can increase the distances
possible, caution should be observed with regard to earth loop potential difference
between the equipment.
Generally RS-232 direct wire connections should be restricted to equipment within the
same local area and powered from a common main power source (having the same
earth path).
Cable Type
Number
of
Pairs
Wire
Conductors
Nominal
Outside
Diameter
(mm)
Nominal
Capacitance pF/m
(between
conductors)
Beldon 8723
2
22 Gauge
Stranded Tinned
copper (7x30)
4.19 116
The recommended cable has individually screened pairs in an aluminum-polyester
shield with a 24AWG stranded tinned copper drain wire. The cables are covered with a
PVC jacket. The wire conductors are polypropylene insulated providing a rating of 300V
at 60
o
c.
The EIA RS-422 and RS-485 standards use a balanced wire pair to send or receive data
signal levels (+5v and -5v DC). This means that the inserted signal is across the pair
and not with respect to ground. When measured at the receiving end it is the difference
across the wire pair that indicates the data bit being transferred. There can be AC or DC
potential difference to ground and not affect the recovery of the transferred data.
Cable Type
Number
of
Pairs
Wire
Conductors
Nominal
Outside
Diameter
(mm)
Nominal
Capacitance pF/m
(between
conductors)
Beldon 9829
2
24 Gauge
Stranded Tinned
copper (7x32)
7.73 51
The recommended cable has individually screened pairs in an aluminum-polyester
shield with an overall tinned copper braid shield (65% coverage). The cable is covered
with a PVC jacket. The wire conductors are polypropylene insulated providing a rating
of 30V at 60
o
c. The nominal impedance of the cable is 100 ohms.
Summary of Contents for MAXPRO-Net
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