Patton electronic 1008 Host First Slave Other Slaves, Connection to the EIA/TIA-574 Interface

Figure 6 (below) shows how to wire the two-pair cables properly for a Model 1008 daisy chain topology. Note that the ground connection is not needed.

HOST	FIRST SLAVE	OTHER SLAVE(S)
XMT+	---------------------RCV+-----------------------	RCV+
XMT-	---------------------RCV- -----------------------	RCV-
RCV+	---------------------XMT+-----------------------	XMT+
RCV-	---------------------XMT- -----------------------	XMT-

Figure 6. Daisy chain wiring for Model 1008 host and slaves

4.3 CONNECTION TO THE EIA/TIA-574 INTERFACE

The Model 1008 is designed to plug directly into the DB-9 serial port of an EIA/TIA-574 DTE device (PC, laptop, host). If you must use a cable to connect the Model 1008 to the DTE device, make sure that it is a straight through cable of the shortest possible length—we recommend 6 ft or less. The DB-9 connector on the Model 1008 is wired according to the EIA/TIA-574 Standard, as shown below:

EIA/TIA-574 Standard

DB-9 SIGNAL

1-----------------CD

2-----------------RD

3-----------------TD

4-----------------DTR

5-----------------SG/FG

6-----------------DSR

7-----------------RTS

8-----------------CTS

9-----------------(Optional 6-12 VDC power)

Note: The Model 1008 is configured as a DCE (Data Communications Equipment), and is therefore designed to connect to a DTE (Data Termination Equipment). If you need to connect the Model 1008 to another DCE device, please call Patton Technical Support at (301) 975-1007 for details on constructing the proper crossover cable.

4.4 OPERATING THE MODEL 1008

Once the Model 1008 is properly installed, it should operate transparently—as if it were a standard cable connection. Operating power is derived from the RS-232 data and control signals; there is no “ON/OFF” switch. All data signals from the RS-232 and RS-485 interfaces are passed straight through. Additionally, one hardware flow control signal is passed in each direction.

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APPENDIX A

MODEL 1008 SPECIFICATIONS

Transmission Format:		Asynchronous
Data Rate:		Up to 115,200 bps
Range:		Up to 9 miles
Serial Interface:		DB-9, male or female; wired as a DCE
		according to EIA/TIA-574 Standard.
Transmit Line:		2, 4 wire unconditioned twisted pair
Transmit Mode:		4-wire, full or half duplex; 2-wire half duplex
Control Signals:		DSR turns “ON” immediately after the
		terminal raises DTR; DCD turns “ON” after
		recognizing the receive signal from the line;
		CTS turns “ON” after the terminal raises
		RTS.
RTS/CTS Delay:		8 mSec or “no delay”
Carrier:		The carrier is switch selected either
		continuous operation or switched operation,
		controlled by RTS
Surge Protection:		600W power dissipation at 1 mS
Power:		Draws operating power from EIA/TIA-574
		data and control signals; no AC power or
		batteries required. If necessary, 6-12 VDC
		can be applied to pin 9 of the EIA/TIA-574
		interface.
Temperature:		0 to 50º C
Humidity:		5 to 95%, non-condensing
Size:		”2.50" x 1.2" x .75"
	Model 1008 Distance Table (miles)
	Data Rate		Wire Gauge
	(kbps)	19	22	24	26
	115.2	3.5	2.6	1.4	0.9
	38.4	5.0	2.9	2.2	1.5
	9.6	7.1	4.6	3.5	2.8
	1.2	9.0	6.5	5.0	3.9

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