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DATA-LINC GROUP
3
DDAA1000/SRM User Guide
PN 161-09981-002C
rev 8/04
Introduction
The DDAA1000/SRM and DD1000/SRM are discrete/analog signal multiplexers. They are designed to provide increased
communication distance where wire lengths are too long or not possible. In general, these units behave as if they replace a
set of wires between the two or more locations. These units are normally factory configured and eliminate the necessity of
having to preset the system configurations. The units are ready for installation into the system upon receipt. If the system
changes, these units do have the capability to be field reconfigured and to have access to the radio setup parameters using
jumper settings and a serial cable to a PC.
Two version of the product exist. The DDAA1000/SRM has both analog and discreet inputs and outputs. The DD1000/SRM
has only the discrete inputs and outputs. Discrete (digital) connections and operations are the same for both of the models.
Only the DDAA1000 has 4-20 mA inputs and outputs. Both the DDAA1000/SRM and the DD1000/SRM have distinct
master and remote units. Each system must have one and only one master, and can up to 8 Remotes.
Both the DDAA1000 and the DD1000 take an input at one end and reproduce it at the other end. The Master unit has a
possible total of 8 discrete inputs, 8 discrete relay drive outputs. The Master has eight 4-20 mA inputs and eight 4-20 mA
outputs. When designing a system that use these units, keep in mind that if using more than one remote (8 possible) that
the Master unit can never have more that 8 digital-in, 8 digital-out, 8 analog-in, and 8 analog-out.
Communication is accomplished using radio transmissions. A six inch unity gain whip antenna is supplied with each unit
for test purposes. Note that line of sight is required for communications. In some instances, under 1/2 mile (.80 km), line of
sight may not be necessary. If line of sight does not exist or the units are to be mounted into grounded metal enclosures,
an external antenna may be needed. If external antennas were not purchased with this equipment, contact Data-Linc Group
for information.
Figure 1: DDAA1000 and DD1000
DDAA1000/SRM/M
Power
CD
Status
Pwr
Rx
4-20mA Input
4-20mA Output
Contact Closure Input
Tx
Contact Closure Output
G 1 2 3 4 5 6 7 8G 1 2 3 4 5 6 7 8
8 7 6 5 4 3 2 1 G8 7 6 5 4 3 2 1 G
(425) 882-2206