2.0 GENERAL INFORMATION
Thank you for your purchase of this Patton Electronics product.
This product has been thoroughly inspected and tested and is
warranted for One Year parts and labor. If any questions or problems
arise during installation or use of this product, please do not hesitate to
contact Patton Electronics Technical Support at (301) 975-1007.
2.1 FEATURES
• Operates asynchronously, point to point or multipoint,
over 2 or 4 wires
• Up to 50 multipoint device drops in a polling environment
• Data rates to 115.2 Kbps
• Passes transmit & receive data, one control signal each direction
• No AC power or batteries are required
• Variable high/low impedance settings
• Able to operate with or without “echo”
• Carrier can be set as “constantly on” or “controlled by RTS”
• Compact size ( 2.66” x 2.10” x 0.73”)
• Twisted pair connection via strain relief, RJ-11 or RJ-45
• Silicon Avalanche Diode surge protection
2.2 DESCRIPTION
The Model 1004A High Speed, Multipoint Short Range Modem
provides exceptional versatility in a compact package. Requiring no AC
power or batteries for operation, the Model 1004A supports
asynchronous RS-232 data rates to 115.2 Kbps over one or two
unconditioned twisted pair. Distances up to 15.0 miles are attainable at
lower data rates (1.2 Kbps, 19 AWG twisted pair).
The Model 1004A can handle up to 50 terminal drops in a
multipoint polling environment. For RS-485 and serial printer
applications requiring hardware handshaking, the Model 1004A passes
one control signal in each direction. The Model 1004A may be
configured for high or low impedance operation, carrier may be set to
“constantly on” or “controlled by RTS”, and the unit can operate with or
without “echo”. RTS/CTS delay may be set for “no delay” or 8 mS.
Options for twisted pair connection include terminal blocks with
strain relief, RJ-11, RJ-45 and dual modular connectors for daisy
chaining. Silicon Avalanche Diodes provide 600 watts per wire of
protection against harmful data line transient surges.
3
3.0 CONFIGURATION
The Model 1004A is configured using an eight position DIP switch
and a DCE/DTE switch. Figure 1 (below) shows the location of the
DCE/DTE switch (externally accessible) on the PC board, as well as
the power supply daughterboard and terminal block.
Figure 2 (below) shows the location of the eight position DIP switch
on the underside of the Model 1004A PC board. Figure 3 (opposite
page) shows the orientation of the eight position DIP switch, with
respect to ON/OFF positions.
4
+RCV- G -XMT+
DCE/DTE
Switch
Terminal
Block
Figure 1. Top view of Model 1004A board, showing DCE/DTE switch.
1
2
3
4
5
6
7
8
ON
DIP Switch
S1
Figure 2. Bottom view of Model 1004A board, showing (internal) DIP switch.
