Point-To-Point Connection With Handshaking; Multidrop Serial Connections - GE VersaMax PLC User Manual

Computer
PIN
RD ( A' )
RD ( B' )
SD ( A )
SD ( B )
CTS ( A' )
CTS ( B' )
RTS ( B ')
RTS ( A )
GND
SHLD
Installation
For public disclosure
Kit* – ITT Cannon DA121073-50 [15-pin size backshell kit]:
Metal-Plated Plastic (Plastic with Nickel over Copper)
Cable Grounding Clamp (included)
Connector
40° cable exit design to maintain low-profile installation
Shell:
Plus – ITT Cannon 250-8501-009 [Extended Jackscrew]:
Threaded with (metric) M3x0.5 for secure attachment
Order Qty 2 for each cable shell ordered
† Critical Information – any other part selected should meet or exceed this requirement.
4.7.5 RS-485 Point-to-Point Connection with
Handshaking
In point-to-point configuration, two devices are connected to the same communication
line. For RS-485, the maximum cable length is 1200 meters (4000 feet). Modems can be
used for longer distances.
Shielded Twisted Pairs
Up to 15.2 meters (50 ft) without isolation
4.7.6 RS-485 Multidrop Serial Connections
In the multidrop configuration, the host device is configured as the master and one or
more PLCs are configured as slaves. The maximum distance between the master and any
slave may not exceed 4000 feet (1200 meters). This figure assumes good quality cables
and a moderately noisy environment. A maximum of 8 slaves can be connected using
RS485 in a daisy chain or multidrop configuration. The RS485 line must include
handshaking and use wire type as specified earlier.
†
†
PLC
PIN
12 SD ( A )
13
SD ( B )
RD ( A' )
10
RD ( B ' )
11
9 RT
6
RTS ( A )
14 RTS ( B )
CTS ( B' )
8
15
CTS ( A' )
3
2
7 GND
1
SHLD
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