SmarTek Systems SAS-1 Relay Interface Configuration And Connection - Manual (Page 6)

SmarTek Systems (www.smarteksys.com) 6
should light based on detections by the SAS-1. To setup SAS-1 or to repeat the SAS-1 setup
using the SAS Monitor and Setup software, connect the supplied serial cable from the PC
running SAS Monitor and Setup directly to the SAS-CT (in place of the cable connecting the
SAS-RI). After setup of the SAS-1 is complete, replace the cable from the SAS-RI (RJA) to the
SAS-CT. Press the SAS-RI Reset switch on the SAS-RI front panel. The Activity LED should
begin to blink after approximately 6 seconds.
When using multiple SAS-1 sensors connected to multiple SAS-RIs as shown in Figure 5, the
default mode for each SAS-1 must be set for Single Relay or Dual Loop with Polled
Communication. Using Polled communication prevents message collision that would occur if
each SAS-1 sent its messages out periodically.
When multiple SAS-1 units are connected to a single SAS-CT with one home run cable or
multiple home run cables (Figure 5), each SAS-1 must have a corresponding SAS-RI. Each
SAS-RI must be configured to identify the bit serial relay “message packet” (from a specific
SAS-1 sensor) that it will acquire and route to it’s relay signal cable or card edge. The SAS-RI
corresponding to SAS0001 is the Master and provides the polling messages to all SAS-1 units in
order of the SAS ID. To configure each SAS-RI, the JP2 header (inside the SAS-RI) should be
jumpered as follows (Yes-jumper present, No-jumper absent):
JP2 SAS-RI #1 SAS-RI #2 SAS-RI #3 .... SAS-RI #6 SAS-RI #1
(SAS0001) (SAS0002) (SAS0003) (SAS0006) (SAS0001)
(Master) (Master, Dual Loop)
A0 Yes No Yes No Yes
A1 No Yes Yes Yes Yes
A2 No No No Yes Yes
As seen in the table above, the JP2 header for the SAS-RI corresponding to SAS0001 (Master
SAS-RI) can be jumpered in one of two ways. Placing a jumper on the A0 pins only of JP2
(leftmost column) sets the SAS-RI as the Master (corresponds to SAS0001) and programs the
SAS-RI to send Single Relay Presence polling commands to all of the SAS-1 units (SAS0001
thru SAS0006). For this mode, only half of the 10 vehicle presence relay signals will be active
(Signals 1A, 2A, 3A, 4A, and 5A). Placing a jumper on the A0, A1, and A2 pins of JP2
(rightmost column) sets the SAS-RI as the Master (corresponds to SAS0001) and programs the
SAS-RI to send Dual Loop Relay polling commands to all of the SAS-1 units (SAS0001 thru
SAS0006). For this mode, all 10 vehicle presence relays are active with each pair (i.e. 1A and
1B) emulating the detector output of a “Dual Loop” Speed Trap configuration. Note that the “A”
signals (1A, 2A, etc) are the uproad detector relays and the “B” signals (1B, 2B, etc.) are the
downroad detector relays.
Figure 6 shows the cabling for multiple SAS-RI cards connected to a single SAS-CT. The cable
used for the interconnects is standard straight thru CAT 5E cable with RJ-45 connectors on both
ends. The cable is connected from the RJ-45 jack on the SAS-CT to the RJA jack on the first
SAS-RI (Master corresponding to SAS0001). The next cable is routed from the RJB jack on the
first SAS-RI to the RJA jack on the second SAS-RI. The next cable is routed from the RJB jack