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8.   Place the 2 halves of the strain relief assembly on either side

of the telephone wire and press together very lightly.  Slide the
assembly so that it is about 2 inches from the terminal posts
and press together firmly.  If your cable diameter is too small
or too large for our strain relief, please contact our technical
support.  We have strain relief assemblies to accommodate
most cable diameters.

9.  Insert the strain relief assembly and wire going into the slot in

the bottom half of the modem case and set it into the recess
in the case.

 RCV  G   XMT

 RCV  G   XMT

10.  Place the top half of the case as necessary to slide it over the

strain relief assembly.  Do not snap the case together yet.  

11.  Insert one captive screw through a saddle washer.  Then

insert the entire piece through the hole in the DB-25 end of
the case.  Snap that side of the case closed.  Repeat the
process for the other side.  This completes cable installation.

4.2   CONNECTION TO THE RS-232 INTERFACE 

Once you have connected the twisted pair wires correctly, simply

plug the Model 1025 directly into the DB-25 port of the RS-232 device.
After doing so, remember to insert and tighten the two captive connec-
tor screws. 

4.2.1   CONNECTION TO A “DTE” DEVICE 

The Model 1025 is wired as a DCE, and therefore wants to plug

into a DTE such as a terminal, PC or host.  Because the Model 1025 is
interface powered, a direct connection to the RS-232 DTE port is most
desirable.  If you must use a cable to connect the Model 1025 to the
DTE port, make sure it is a 

straight through cable of the shortest possi-

ble length—we recommend 6 feet or less. 

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Summary of Contents for 1025

Page 1: ...1025S Synchronous Short Range Modem with Clocking Options SALES OFFICE 301 975 1000 TECHNICAL SUPPORT 301 975 1007 http www patton com Part 07M1025 C Doc 041012UC Revised 4 20 98 C E R T I F I E D An...

Page 2: ...d to provide reasonable protection from such interference in a commercial installation However there is no guarantee that interfer ence will not occur in a particular installation If the Model 1025 do...

Page 3: ...ioned twisted pair Customized VLSI chip with separate filter for each data rate No AC power or batteries required Miniature size Silicon Avalanche Diode surge protection Model 1025S 2 2 DESCRIPTION Th...

Page 4: ...d by the host terminal the Model 1025 raises CTS after a delay in order to give the remote termi nal time to receive an incoming signal Depending on the type of envi ronment either a 7mS or 53mS delay...

Page 5: ...RS 232 interfaces and how to operate the Model 1025 4 1 CONNECTION TO THE TWISTED PAIR INTERFACE The Model 1025 supports data only communication between two RS 232 devices at distances to 11 miles an...

Page 6: ...nsitive so either wire may connect to either pole 5 Connect the other pair of wires to the two RCV receive poles on the terminal block The Model 1025 is not polarity sensi tive so either wire may conn...

Page 7: ...one captive screw through a saddle washer Then insert the entire piece through the hole in the DB 25 end of the case Snap that side of the case closed Repeat the process for the other side This compl...

Page 8: ...r 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...

Page 9: ...Model 1025 4 RTS Request to Send To Model 1025 5 CTS Clear to Send From Model 1025 6 DSR Data Set Ready From Model 1025 7 SG Signal Ground 8 DCD Data Carrier Detect From Model 1025 To Model 1025 Data...

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