LINK Systems OmniLink - Feed Interface - Manual (Page 19)

OmniLink 5000 Feed Manual December 13, 1999
2.13
Manual Rev 2.3
2.19 Rapid-Air Interface
The Rapid-Air interface is somewhat different
from most of the feed interfaces. Many of the feed
functions are controlled from a small keypad and
screen that connects to the only available
communications port on the feed control itself. A
special adapter board must be used to communicate
with the feed. In addition, the old communications
board needs an RS-232 to RS-485 converter to
enable the System 5000 to communicate with the
feed. The new communications board feed port can
be configured to be RS-232 or RS-485.
2.19.1 Rapid-Air Connections with Old
Communications board
The connection to a Rapid-Air Feed from the old
communications board is as follows:
Table 2.18
OmniLink OIT To RS-485
Converter Connections for Old
Communication Board
OmniLink
Feed Port Function RS-485
Converter
Pin 1
(GND) Ground Pin 7 (GND)
Pin 2
(RXD) Receive data
from feed Pin 2 (TXD)
Pin 3
(TXD) Transmit data
to feed Pin 3 (RXD)
Table 2.19
RS-485 Converter to Rapid-Air
Connections for Old Communication
RS-485
Converter Function Rapid-Air
Connector J58
Ground Ground Pin 5
TXD+ Transmit + Pin 8
TXD- Transmit- Pin 9
RXD+ Receive+ Pin 6
RXD- Receive- Pin 7
Notes:
‚ Rapid-Air has used two different servo controls
at different times, the Pacific Scientific SC750
series, and the SC950 series. The comm
connector is the same on each of the controls.
‚ The connections from the operator terminal to
J58 must also remain in place.
‚ On the SC750 series of servo controls, Input 14
(Pin 6 of J56) must be low to enable remote
download of feed parameters. On the SC950
series of servo controls, there is a circuit board
below the communications connector with
terminals on it. If the wires to the board have
resistors at the terminals, then terminal 14
s h o u l d be disconnected to enable
communications. Call Rapid-Air if there is any
trouble in identifying these inputs.
‚ If the feed is powered down but the System
5000 is not, the feed will lose the current length,
speed, and acceleration values but the 5000 will
not know that. To reset the values in the feed,
the feed screen must be entered and the length
reprogrammed. This will reset all three values.
If both units are powered down, everything will
be reset automatically.