Cable Guide. Click on the subject to view the information. Digi Cables Building Cables General Cable Information

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1 Cable Guide Click on the subject to view the information. Digi Cables Building Cables General Cable Information

2 Digi Cables Click on the subject to view the information. Digi Connector Options Digi Connector Part Numbers Digi Pin Assignments

3 Digi Connector Options This section contains the following topics: Digi DB25 Connectors Digi RJ45 Connectors Digi RJ45 to DB25 Conversion Digi Concentator Daisy Chain Cable Digi Concentrator Fiber Optic Connection Digi Concentrator Remote Cabling Options Digi DB25 Connectors Digi DB25 OctaCable Assembly (QuadCable Assembly also available)

4 Digi DB25 EightPort Connector Box (FourPort Connector Box also available) Digi RJ45 Connectors Digi RJ45 EightPort Connector Box (FourPort Connector Box also available)

5 Digi RJ45 to DB25 Conversion RJ45 10Pin to DB25 Male RJ45 to DB25 Cable Legs can be ordered from Digi. This cable is made with a full 10pin RJ45 plug connected via a two or four foot cable to a DTEconfigured DB25 plug. The pin configuration of the DB25 connector on the Cable Leg is identical to that of the DB25 connectors on the standard Digi octacable, and provides full modem control.

6 Digi Concentrator Daisy Chain Cable EightWire Direct The synchronous cables provided by Digi with the concentrators are EightWire Direct (EIA422) cables. This is a twisted pair cable with a male HD 15 (highdensity DB15) connector at one end and a female HD15 at the other end. EightWire Direct is the standard method for connecting concentrators to Host Adapter synchronous lines, and to other concentrators.this cable provides transmit and receive data signals plus discrete clock signals for transmit and receive data. This permits synchronous data rates of up to 10 megabaud, which results in the maximum data throughput under moderate to heavy loads. Digi Concentrator Fiber Optic Connection An optional high speed fiber optic connection for the C/X and EPC/X Systems is available from Digi. It consists of two fiber optic conversion boxes and connecting cables for the host adapter and concentrator. Fiber optic cable must be purchased separately.

7 Digi Remote Cabling Options EightWire Synchronous Modem C/X and EPC/X host adapters and C/CON concentrators have been designed so that the synchronous ports can support either EIA422 or EIA232 line levels. EIA422 EightWire synchronous modem cables are not available from Digi. EightWire Synchronous Modem wiring allows concentrators to be installed in remote locations and connect to the host adapter via EIA232 or EIA422 synchronous modems, DSUs/CSUs, frame relay adapters, fractional T1s or ISDN terminal adapters. The EIA232 synchronous modem cable is a twisted pair cable with a male HD15 (highdensity DB15) connector at one end and a female DB25 at the other end. EIA232 EightWire synchronous modem cables available from Digi: Host Adapter to EIA232 Modem Host EIA232 Modem to Remote Concentrator

8 Digi Connector Part Numbers This section contains the following topics: Connector Options for Asynch Adapters Converter Options (Cable Legs) Concentrator Daisy Chain Cable Concentrator Fiber Optic Connection Concentrator Remote Cabling Options Connector Options for Asynch Adapters 4 Port, Male DTE: For ClassicBoard 4, PC/4, PC/4e, PC/4r, and PCI/4r 4 Port DB25M DTE Cable Port DB25M DTE Box Port RJ45 Connector Port, Male DTE: For ClassicBoard 8, PC/8, PC/8e,PC/8r, and PCI/8r 8 Port DB25M DTE Cable Port DB25M DTE Box Port RJ45 Connector

9 Converter Options (Cable Legs) One adapter cable needed per port Cable RJ45 to DB25 Male Cable RJ45 to DB25 Male Concentrator Daisy Chain Cable (C/X and EPC/X) EightWire Direct Cable CX Cable 10ft HD15 Connectors Concentrator Fiber Optic Connection (C/X and EPC/X) Fiber optic cable must be purchased separately FL Adapter Domestic Concentrator Remote Cabling Options (C/X and EPC/X) EIA232 EightWire Synchronous Modem Cable Host Adapter to 232 Modem Cable Host 232 Modem to Concentrator

10 Digi Pin Assignments This section contains the following topics: Digi DB25 Connector Pin Assignments Digi RJ45 Connector Pin Assignments Digi Concentrator Daisy Chain Cable Pin Assignments (HD15) Digi DB25 Connector Pin Assignments DB25 Pin Assignment Table Signal Description DTE Use Pin # GND Chassis Ground N/A Shell TxD Transmitted Data Output 2 RxD Received Data Input 3 RTS Request to Send Output 4 CTS Clear to Send Input 5 DSR Data Set Ready Input 6 SG Signal Ground reference 7 DCD Data Carrier Detect Input 8 DTR Data Terminal Ready Output 20 RI Ring Indicator Input 22

11 Digi RJ45 Connector Pin Assignments RJ45 Pin Assignment Table Signal Description DTE Use Pin # RI Ring Indicator Input 1 DSR Data Set Ready Input 2 (DCD*) (Data Carrier Detect*) RTS Request to Send Output 3 GND Chassis Ground N/A 4 TxD Transmitted Data Output 5 RxD Received Data Input 6 SG Signal Ground reference 7 CTS Clear to Send Input 8 DTR Data Terminal Ready Output 9 DCD Data Carrier Detect Input 10 (DSR*) (Data Set Ready*) *When ALTPIN is in effect.

12 Digi Concentrator Daisy Chain Cable Pin Assignments (HD15) HD15 Pin Assignment Table Signal Description Function Pin # RxD Received Data Minus Input 1 RxD Received Data Plus Input 2 RxC Received Clock Minus Input 4 RxC Received Clock Plus Input 5 TxD Transmitted Data Output 6 Minus TxD Transmitted Data Plus Output 7 TxC Transmitted Clock Output 9 Minus TxC Transmitted Clock Plus Output 10 GND Chassis Ground N/A Shell

13 Building Cables Click on the subject to view the information. DB25 Cable Wiring RJ45 / RJ11 Cable Wiring RJ45 to Modem (DB25) Wiring Xe and Xr (EIA422) Wiring C/X and EPC/X Concentrator Wiring

14 DB25 Cable Wiring This section contains the following topics: DB25 to Modem (DB25) DB25 Software Handshaking (XON/XOFF) DB25 Hardware Handshaking (Ready/ Busy) DB25 to Modem (DB25) DB25 to DB25 StraightThrough Cable DB25 Female Signal Pin GND Shell TxD 2 RxD 3 RTS 4 CTS 5 DSR 6 SG 7 DCD 8 DTR 20 RI 22 ( Cable Shield) DB25 Male Pin Signal 1 GND 2 TxD 3 RxD 4 RTS 5 CTS 6 DSR 7 SG 8 DCD 20 DTR 22 RI To connect to a modem, use a standard straightthrough cable.

15 DB25 Software Handshaking (XON/XOFF) Simple Terminal/Printer Cable (DB25) DB25 Female Signal Pin GND Shell TxD 2 RxD 3 RTS 4 CTS 5 DSR 6 SG 7 DCD 8 DTR 20 RI 22 ( Cable Shield) DB25 Male Pin Signal 1 GND 2 TxD 3 RxD 4 RTS 5 CTS 6 DSR 7 SG 8 DCD 20 DTR 22 RI This cable is a threewire null modem cable. Transmitted Data on one end of the cable is connected to Received Data at the other end, and vice versa. The male DB25 end can be plugged directly into most serial terminals and printers without any adapters. The female DB25 end plugs directly into one of the DB25 connectors on the fan out cable or connector box assembly.

16 In most cases, serial terminals and printers need only a threewire connection. Digi device driver software supports XON/XOFF (software) handshaking, so the only signal lines necessary are Transmitted Data (TxD), Received Data (RxD), and Signal Ground (SG).

17 DB25 Hardware Handshaking (Ready/Busy) Terminal/Printer Cable with DTR Handshaking DB25 Female Signal Pin GND Shell TxD 2 RxD 3 RTS 4 CTS 5 DSR 6 SG 7 DCD 8 DTR 20 RI 22 ( Cable Shield) DB25 Male Pin Signal 1 GND 2 TxD 3 RxD 4 RTS 5 CTS 6 DSR 7 SG 8 DCD 20 DTR 22 RI This cable is valid with any Digi DB25 serial port including Concentrator ports, PORTS/Xem Modules, ClassicBoards, and Xe, Xr, PC/X adapters. Most terminals and printers use Data Terminal Ready (DTR) for Ready/Busy hardware handshaking. The cable shown supports this method. Some Okidata printers use a control signal on pin 11, called Supervisory Send Data (SSD) instead of DTR. In this case, simply connect CTS on the

18 female DB25 side to pin 11 of the male DB25, instead of pin 20. Other printer manufacturers may use different methods of flow control. Consult your printer s documentation for specific wiring requirements.

19 RJ45 / RJ11 Cable Wiring This section contains the following topics: RJ45 10Pin Connector Referencing RJ45 / RJ11 Software Handshaking (XON/XOFF) RJ45 Hardware Handshaking (Ready/Busy) Relationship of Different RJ Plugs to Digi RJ45 10Pin Connector RJ45 10Pin Connector Referencing Note the correct pin order. It is a common error to reverse the order of the pins when building cables. Open end of the Digi RJ45 connector. Pin 1 Pin 10

20 RJ45 / RJ11 Software Handshaking (XON/ XOFF) Simple Terminal/Printer Cable (RJ11) Pin 4 Pin 1 RJ11 4 Pin Signal Pin GND TxD RxD SG ( Cable Shield) DB25 Male Pin Signal GND TxD RxD SG This cable is a threewire null modem cable. Transmitted Data on one end of the cable is connected to Received Data at the other end, and vice versa. The RJ45 8pin connector uses the same wiring with the center pins only pins 3, 4, 5, and 6. See Relationship of Different RJ Plugs in this section. The male DB25 end can be plugged directly into most serial terminals and printers without any adapters. The RJ11 plug fits into the center of the RJ45 jack.

21 In most cases, serial terminals and printers need only a threewire connection. All Digi device driver software supports XON/XOFF (software) handshaking, so the only signal lines necessary are Transmitted Data (TxD), Received Data (RxD) and Signal Ground (SG).

22 RJ45 Hardware Handshaking (Ready/Busy) Terminal/Printer Cable with DTR Handshaking Pin 8 Pin 1 RJ45 8 Pin Signal Pin DSR RTS GND TxD RxD SG CTS DTR ( Cable Shield) DB25 Male Pin Signal RTS CTS GND TxD RxD SG DTR Most terminals and printers use Data Terminal Ready (DTR) for Ready/Busy hardware handshaking. This cable supports that method. Some Okidata printers use a control signal on pin 11, called Supervisory Send Data (SSD) instead of DTR. In this case, simply connect CTS on the RJ 45 side to pin 11 of the DB25, instead of pin 20. Other printer manufacturers may use different methods of flow control. Consult your printer s documentation for specific wiring requirements.

23 Relationship of Different RJ Plugs to Digi RJ45 10Pin Connector Pin Relationship Table RJ11 RJ45 6Pin 8Pin RJ11 4Pin RJ45 10Pin Signal Name Digi 10Pin 1 RI DSR (DCD*) RTS GND TxD RxD SG CTS DTR 9 10 DCD (DSR*) 10 *When ALTPIN is in effect.

24 RJ45 to Modem (DB25) Wiring This section contains the following topics: RJ45 10Pin Connector Referencing RJ45 10Pin to Modem (DB25) RJ45 8Pin to Modem (ALTPIN Option) RJ45 10Pin Connector Referencing Note the correct pin order. It is a common error to reverse the order of the pins when building cables. Open end of the Digi RJ45 connector. Pin 1 Pin 10

25 RJ45 10Pin to Modem (DB25) The simplest way to connect a modem to an adapter with RJ45 connectors is to use RJ45 to DB25 Cable Legs, available from Digi. These adapters use 10pin RJ45 plugs, and therefore provide full modem support (Ring Indicator and Data Carrier Detect are only available on 10pin RJ45 connectors). RJ45 to DB25 Modem Cable (10 Wire) Pin 10 Pin! RJ45 10 Pin Signal RI DSR RTS GND TxD RxD SG CTS DTR DCD Pin ( Cable Shield) DB25 Male Pin Signal RI DSR RTS GND TxD RxD SG CTS DTR DCD Follow this diagram when building your own modem cable.

26 RJ45 8Pin to Modem (ALTPIN option) 10pin RJ45 plugs may be difficult to obtain in the retail market; therefore, most Digi device driver software incorporates an optional feature called ALT PIN, which swaps the logical functions of DSR (Data Set Ready) with DCD (Data Carrier Detect). When ALTPIN is enabled, DCD becomes available on pin 1 of an 8pin RJ45 connector (equivalent to pin 2 of a 10pin connector). 8Wire Modem Cable for use with ALTPIN Configuration Pin 8 Pin 1 RJ45 8 Pin Signal Pin DCD RTS GND TxD RxD SG CTS DTR ( Cable Shield) DB25 Male Pin Signal DCD RTS GND TxD RxD SG CTS DTR

27 If you wish to build an 8wire modem cable for a Digi RJ45 port, use an 8pin RJ45 plug wired as shown in the diagram. ALTPIN is not supported under Windows NT when the ports are to be used with the Remote Access Service (RAS) or any application that requires RI, DCD, and DSR. Use the full 10 wire modem cable in these cases. For information about enabling ALTPIN in software see: Software Setup of AccelePort Products

28 Xe and Xr (EIA422) Wiring This section contains the following topics: General Information EIA422 Null Modem for Hardware Handshaking EIA422 Null Modem for Software Handshaking EIA422 DTE to DCE Connection General Information This section applies to AccelePort Xe and Xr EIA 422 model adapters. The EIA422 interface provides four signals: Transmitted Data (TxD), Received Data (RxD), Request To Send (RTS) and Clear To Send (CTS). The functions of these signals is identical to their EIA 232 counterparts. Two wires are required for each signal, a positive lead ( ), and a negative lead ( ). The leads at one end of the cable must be connected to the

29 leads at the other end, and the leads at one end must be connected to the leads at the other end. Incorrect wiring could result in damage to the connected devices. Refer to your peripheral s documentation for that device s pin number. A DTE device is a terminal, serial printer, serial port for another computer, etc. The Digi board is also a DTE device. To connect a DTE device to another DTE device a null modem cable or adapter must be used.

30 EIA422 Null Modem for Hardware Handshaking Hardware Handshaking Wiring Chart

31 EIA422 Null Modem for Software Handshaking Software Handshaking Wiring Chart

32 EIA422 DTE to DCE Connection DTE to DCE Wiring Chart

33 C/X and EPC/X Concentrator Wiring This section contains the following topics: EightWire Direct Wiring FourWire Direct Wiring EIA232 EightWire Synchronous Modems EIA422 EightWire Synchronous Modems V.35 Synchronous Cable Wiring EightWire Direct Wiring HD15 Male to HD15 Female Host Adapter or Concentrator "Remote" Port Concentrator "Host Adapter" Port 1 RxD 2 4 RxC 5 6 TxD 7 9 TxC 10 GND Shell Cable Shield 1 2 TxD 4 5 TxC 6 7 RxD 9 10 RxC Shell GND HD15 Male HD15 Female

34 The synchronous cables provided by Digi with the concentrators are EightWire Direct (EIA422) cables. This is the standard method for connecting concentrators to Host Adapter synchronous lines, and to other concentrators. EightWire Direct cables provide transmit and receive data signals plus discrete clock signals for transmit and receive data. This permits synchronous data rates of up to 10 megabaud, which results in the maximum data throughput under moderate to heavy loads. The EightWire Direct cable is a twisted pair cable with a male HD15 (highdensity DB15) connector at one end and a female HD15 at the other end. The cable should be shielded, and the shield must be connected to the HD15 connector shell at both ends.

35 FourWire Direct Wiring HD15 Male to HD15 Female Host Adapter or Concentrator "Remote" Port Concentrator "Host Adapter" Port 1 1 RxD 2 2 TxD 6 6 TxD 7 7 RxD GND Shell Cable Shield Shell GND HD15 Male HD15 Female In the FourWire Direct (EIA422) wiring mode, the clock signals are encoded with the receive and transmit data signals, so only two twisted pairs are required. The FourWire Direct cable is a twisted pair cable with a male HD15 (highdensity DB15) connector at one end and a female HD15 at the other end. The cable should be shielded, and the shield must be connected to the HD15 connector shell at both ends.

36 EIA232 EightWire Synchronous Modem HD15 Male to DB25 Male and DB25Male to HD15 Female C/X or EPC/X Host Adapter Synchronous Port RS232 Synchronous Modem RS232 Synchronous Modem Concentrator "Host Adapter" Port Cable Shield RxD RxC TxD TxC SG RTS CTS DSR DTR GND RxD RxC TxD TxC SG RTS CTS DSR DTR GND Cable Shield RxD 1 RxC 4 TxD 6 TxC 9 GND 12 RxC 5 TxC 10 GND Shell 6 RxD 9 RxC 1 TxD 4 TxC 12 GND 10 RxC 5 TxC Shell GND HD15 Male DB25 Male DB25 Male HD15 Female To connect host adapters and concentrators to EIA 232 synchronous modems, use the special cables shown in the diagram. Four 2200 pf capacitors (X7R 50V type) are required two for the host adapter, and two for the concentrator. Install the capacitors between the positive and negative leads of the TxC and RxC signals on the back of the HD15 connectors.

37 The EIA232 wiring feature is not supported by device driver software released prior to 9/1/92. Older releases support only EIA422 wiring. Only the negative lead for each EIA422 signal is used in this configuration. The positive lead is left floating. EIA422 EightWire Synchronous Modems HD15 Male to DB37 Male and DB37Male to HD15 Female C/X or EPC/X Host Adapter Synchronous Port RS422 Synchronous Modem RS422 Synchronous Modem Concentrator "Host Adapter" Port RxD RD RD RxD RxC RT RT RxC TxD SD SD TxD TxC ST ST TxC GND 12 Cable Shield 19 GND GND 19 Cable Shield 12 GND HD15 Male DB37 Male DB37 Male HD15 Female The EIA422 Synchronous Modem cables are twisted pair cables, each having an HD15 (highdensity DB15) connector at one end and a DB37 connector at the other end. The cable should be

38 shielded, and the shield must be connected as shown in the diagram. V.35 Synchronous Cable Wiring V.35 wiring allows concentrators to be installed in remote locations and connected to the host adapter via V.35 DSUs/CSUs, frame relay adapters, fractional T1s or ISDN terminal adapters. Winchester Connectors

39 DB25 Connectors

40 General Cable Information This section contains the following topics: Cable Requirements Grounding Requirements Environment Requirements Data Rate Information Transmission Errors Cable Requirements EIA232 serial interface cables should be shielded, low capacitance cables, ideally designed specifically for serial data transmission. EIA422 interface cables should be shielded twistedpair cables. Each signal requires two leads (one twisted pair of wires) to complete a balanced voltage digital circuit. The shield should be connected to the Chassis Ground of the devices at both ends of the interface cable.

41 Grounding Requirements EIA232 interface cables should have the shield grounded at both ends of the cable. Chassis Ground available on the shell of Digi s DB25 connectors, and pin 4 of our 10pin RJ45 connector, is ideal for this purpose. EIA422 interface cables must provide a ground path between the devices to be connected. This insures the integrity of data transfers and control signals. This should be connected to the Chassis Ground of each device. Digi recommends using the cable shield for this purpose. Environment Requirements While good shielding provides reasonable protection against noise (ElectroMagnetic Interference, or EMI), cables should still be routed away from noise sources wherever possible. Avoid laying cables in close proximity to transformers, generators, motors, fluorescent lights, etc.

42 Data Rate Information The maximum date rate which may be used for EIA 232 connections is primarily determined by the quality and length of the interconnecting cable. The quality of the cable (for transmission purposes) is generally determined by the capacitance per foot rating of the cable. The Data Rate vs. Cable Length table gives the recommended maximum cable length for a given baud rate. Longer cables may be implemented at the user s discretion. Data Rate vs. Cable Length Baud Rate Max Cable Length 57,600 or less 100 feet 115, feet 230, feet 460, feet 921, feet

43 The table assumes the following: 1. The maximum length is the amount of cable which may be connected to a Digi supplied interconnect device such as Quad or Octa cables and boxes. 2. Maximum length is based on a cable rated at: 12.3 pf/foot, conductor to conductor 22.4 pf/foot conductor to shield Transmission Errors If transmission errors occur, attempt the following to determine the cause of the problem: 1. Reduce the baud rate. 2. Reduce the cable length. 3. Use a cable with a lower capacitance per foot rating. In situations where lowcapacitance cable is unavailable, or very long cable runs are required, shorthaul modems, available from suppliers such as Black Box, can be used to increase the effective range of the EIA232 interface. Shorthaul modems are similar to standard modems, except that they

44 are connected directly to each other via a cable instead of going through a telephone circuit. Note: Use only externallypowered shorthaul modems with Digi products.