Patton electronic 1008 - Manual (Page 15)

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”
• Ultra-miniature size (2.50" x 1.20" x 0.75")
• Twisted pair connection via strain relief, RJ-11 or RJ-45
• Silicon Avalanche Diode surge protection
2.2 DESCRIPTION
The Model 1008 High Speed, Multipoint, DB-9 Short Range
Modem provides exceptional versatility in an ultra-miniature package.
Requiring no AC power or batteries for operation, the Model 1008
supports asynchronous EIA/TIA-574 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 1008 can handle up to 50 terminal drops in a multipoint
polling environment. For RS-485 and serial printer applications
requiring hardware handshaking, the Model 1008 passes one control
signal in each direction. The Model 1008 may be configured for high or
low impedance, 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 14
HOST FIRST SLAVE SECOND SLAVE
XMT+ RCV+
RCV+
XMT- RCV-
RCV-
RCV+ XMT+
XMT+
RCV- XMT-
XMT-
Figure 5. Star wiring for Model 1008 host and slaves