Connection to a DCE Device, Weight 2 oz

4.2.2 CONNECTION TO A “DCE” DEVICE

Since the Model 1025 is wired as a DCE, you cannot connect it directly to another DCE such as a modem, multiplexer or printer. If you need to connect the Model 1025 to another DCE device, you must use a null modem cable wired according to diagram below. We recom- mend that the cable is as short as possible, preferably 6 feet or less.

Connection to Model 1025†	Connection to DCE Device
DB-25 Pin No.	DB-25 Pin No.
1	1
2	3
3	2
4	8
8	4
6	20
20	6
17	24
24	17
7	7

†Note: When connecting to another DCE device, the Model 1025 should be configured for “external clock” (see Section 3.2).

4.3OPERATING THE MODEL 1025

Once the Model 1025 is properly configured and 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 inter- face are passed straight through. All control signals from the RS-232 interface are looped back.

Note: If your system requires hardware flow control, you will need the Patton Model 1030 or Model 1070 Short Range Modem. Call Patton Customer Service at (301) 975-1007 for more information.

APPENDIX A

SPECIFICATIONS

Transmission Format: Synchronous, full duplex

Transmission Line: Two unconditioned twisted pair 19 - 26 AWG

Clocking: Internal, external or receive loopback

Range: (See table below)

Interfaces: EIA RS-232, CCITT V.24

Data Rates: 1.2 - 19.2 Kbps

Isolation: Minimum 1500 V RMS via custom transformers

Surge Protection: 600W Surge Protection (10x1000µs waveform) (Model 1025S)

Control Signals: CTS turns on 8 or 53 mS (switch selectable) after the terminal raises RTS; DSR and DCD are constantly on

Connectors: DB-25 male or female on RS-232 side; RJ-11, RJ-45 or terminal block with strain relief on line side

Power Supply: No external power required; uses power from EIA data and control signals

Temperature Range: 0-60°C(32-140°F)

Altitude: 0-15,000 feet

Humidity: Up to 95% non-condensing

Dimensions: 2.66” x 2.10” x 0.73”

Weight: 2 oz.

Model 1025 Distance Table (miles)

Data		Wire Gauge
Rate	19		24	26
19,200	7.5		3.5	2.5
9,600	10.0		3.5	2.5
4,800	10.0		7.0	4.0
2,400	10.0		8.5	5.0
1,200	11.0		8.5	6.0