Cut Sheet

5.4.4 Conguring the Scanning Method
The control module may be congured for one of four available scanning methods: straight, interlaced, edge, or skip.
Straight Scan is the default mode in which all beams are scanned in sequence from the boom end (cable end) to the top end of the
sensors.
Interlaced Scan alternates a straight scan with a slanted-beam scan. A slanted-beam scan begins with a beam established between the
emier's second channel and the receiver’s rst channel, and between the emier’s third channel and receiver’s second channel,
connuing up the array to the last emier channel and next-to-last receiver channel. The last emier channel is then reacvated to
establish a beam to the last receiver channel to complete the scan. Alternang this slanted-beam scan with a straight scan improves
opcal resoluon within the middle one-third of the scanning range.
Edge Scan acvates only the beams located near the top edge of an object in the light screen. “Top edge” refers to the edge of the
object passing nearest the top end of the sensors (i.e., the top of the light screen, farthest from the sensor’s cabled end). Each scan
begins six beams prior to the last beam blocked during the previous scan. The scan
connues from this point and moves upward to the
rst unblocked beam, where the scan is completed. When the array is clear, the system will execute straight scans. Edge Scan begins
again when a blocked channel is detected. This scanning mode is designed to reduce sensing response me when measuring or locang
only one edge of an object. Use of the Edge Scan mode limits the scan analysis mode selecon to Last Beam Blocked (LBB).
Skip Scan reduces response
me at the expense of decreased sensing resoluon. Skip Scan mode allows from one to seven beams to be
skipped during each scan. For example, with one beam skipped, only beams 1, 3, 5, 7, etc. will be interrogated. With two beams
skipped, only 1, 4, 7, 10, etc. will be interrogated, and so on.
Figure 5. Interlaced scan improves opcal resoluon in the middle one-third of the scanning range.
5.4.5 Conguring the Control Mode
The controller can be
congured for Connuous scanning, Gated scanning, or for Host mode. The module oers an opcally-isolated
Gate input, which is energized by applicaon of 10 to 30 V dc. Gang is typically accomplished using a dc presence sensing device. Host
mode allows the array to be gated by a host computer or programmable logic controller (PLC).
All MINI-ARRAY Systems can communicate with a host computer or controller via RS-232 serial protocol. In
addion, controller models
MAC-1, MACN-1, and MACP-1 also can communicate via RS-485. The host can direct the MINI-ARRAY System to scan on demand and/or
receive the scan data directly from the MINI-ARRAY System in binary or ASCII form. Selectable communicaon baud rates are 9600,
19200, and 38400.
5.4.6
Conguring the Serial Communicaon
The MINI-ARRAY System can communicate with its host computer or controller via either RS-232 (all models) or RS-485 (MAC-1,
MACN-1, MACP-1 models) serial protocol. The host can direct the MINI-ARRAY to scan on demand, and/or receive the scan data directly
from the MINI-ARRAY System in Binary or ASCII form.
A-GAGE
®
MINI-ARRAY
®
Measuring Light Screen System
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