1 SyncLink GT2/GT4 Serial Adapter Hardware User s Manual MicroGate Systems, Ltd MicroGate and SyncLink are registered trademarks of MicroGate Systems, Ltd. Copyright MicroGate Systems, Ltd. All Rights Reserved
2 Contents Overview... 3 Features... 3 Specifications... 3 Y Cables... 4 Signal Specifications... 5 Single Ended Signals (RS 232/V.28)... 5 Differential Signals (RS 422/RS 485/V.11)... 5 Clock Polarity... 5 Serial Interface Selection... 7 Differential Input Termination... 8 Differential Fail Safe Biasing... 9 Serial Connector Pin Assignments RS V RS 422/RS 449/RS 485/RS X General Purpose I/O Signals DC GPIO Specifications... 16
3 Overview The SyncLink GT2 and GT4 Serial Adapters are add in cards for use in systems with a PCI expansion slot. The cards provide two (GT2) or four (GT4) serial ports for use by the system. A variety of serial protocols and interface standards are supported. Refer to the software documentation included with the card for details on using the card for a specific application. Features Maximum Speeds 10Mbps synchronous Mbps asynchronous with standard oscillator ( MHz) 4Mbps asynchronous with custom oscillator (32MHz) SDLC, HDLC, BISYNC, MONOSYNC, ASYNC, raw bit synchronous protocols Selectable hardware CRC: CRC 16, CRC 32, None DPLL Clock Recovery (x8 and x16 sampling) Clock Generation Configurable transmit preamble and idle patterns Encoding: NRZ,NRZB,NRZ L,NRZI,NRZ M,NRZ S,FM0,FM1,Manchester,differential biphase level Selectable interface for RS 232, V.35, RS 422/485, RS 530, RS 449, X.21 Optional termination for differential inputs Optional fail safe biasing for differential inputs Full set of control and status signals (DTR,DSR,RTS,CTS,DCD,RI,LL,RL) Specifications MicroGate FPGA serial controller (2 or 4 ports) PCI 3.0 (compatible with 5V, 3.3V, and PCI X slots) Bus Master DMA data transfer Operating Temperature: 0C to 60C standard, 40C to +85C optional Storage Temperature: 55C to +125C Environmental: humidity 0 to 95% non condensing; alt. 200 to +20,000 ft Mechanical: Standard PCI short card; length 6.875", height 4.2", Weight 5.5 Oz Power usage: 300mA 5V, 80mA +12V, 80mA 12V Regulatory: FCC Class B, CE, ANSI C63.4 Class B, VCCI Class B, EN55022 Class B, EN55024, RoHS Connectors: DB 25 (male) Cable Options: DB 25 (female) to DB 25 (male); DB 25 (female) to 34 pin V.35 (male); DB 25 (female) to 37 pin RS 449 (male); DB 25 (female) to 15 pin X.21 (male)
4 Y Cables The card has two 60 pin connectors, each carrying two ports. Y cables are included with the card to convert each 60 pin connector into two standard DB 25 male connectors. The GT2 card uses one 60 pin connector and includes a single Y cable for a total of 2 ports. The GT4 card uses both 60 pin connectors and includes two Y cables for a total of 4 ports. Each branch of a Y cable is labeled with a port number. The Y cable labeled 1 and 2 should be installed on the 60 pin connector closest to the PCI edge connector (gold fingers). The Y cable labeled 3 and 4 should be installed on the 60 pin connector farthest from the PCI edge connector. Note: The serial controller on the GT2 has only two ports. Adding a Y cable to the second 60 pin connector of a GT2 card will not add ports 3 and 4. Figure 1 Y Cables and Port Numbering
5 Signal Specifications Each serial signal (control, status, data, or clock) is compatible with an electrical specification that is selected by placement of jumpers on the card. This section briefly describes the specifications supported by the card. Single Ended Signals (RS 232/V.28) Single ended signals supported by the card are compatible with both RS 232 and ITU V.28 standards. Each single ended signal uses one conductor in a cable, and all single ended signals share a common ground conductor. Maximum Voltage Range: +15 to 15V (between signal and ground) +3V to +15V (+5V typical) = control/status signal on or data value of 0 3V to 15V ( 5V typical) = control/status signal off or data value of 1 Voltage between 3V to +3V = invalid (indeterminate) state Max cable length 50 feet Max data rate 20kbps The maximum data rate of 20kbps is part of the RS 232/V.28 standards. The SyncLink card can operate at speeds up to 120kbps depending on the cable length and loading. Longer cables and increased loading reduces the maximum supported data rate. Differential Signals (RS 422/RS 485/V.11) Differential signals supported by the card are compatible with RS 422, RS 485 and ITU V.11 standards. Each differential signal uses two conductors in a cable (signal pair). A common ground conductor is recommended for use with differential signals to reduce common mode voltages between cable ends which may result in incorrect or impaired operation. Maximum Voltage Range: +5 to 5V (between conductors in a pair) +200mV to +5V (+2V typical) = control/status signal on or data value of 0 200mV to 5V ( 2V typical) = control/status signal off or data value of 1 Voltage between 200mV to +200mV invalid (indeterminate) state Max cable length 4000 feet Max data rate 10Mbps Longer cables and increased loading reduces the maximum supported data rate. Clock Polarity Synchronous serial communications (HDLC/Bisync/Monosync) may use separate clock signals to control the timing of data signals. One clock cycle equals one bit. There are two clock edges (rising and falling) for each clock cycle. On one edge, the transmit data output changes. On the other edge, the receive data input is sampled. The assignment of clock edges to transmit data transition and receive data sampling is referred to as clock polarity.
6 The SyncLink card uses the clock polarity in the RS 232/RS 422/V.24/V.28/V.11 standards as described below: RS 232/V.28 Single Ended Signals +3V to +15V (+5V typical) = clock on 3V to 15V ( 5V typical) = clock off On to Off edge (falling edge) = receive data sample (bit center) Off to On edge (rising edge) = transmit data transition (bit edge) RS 422/RS 485/V.11 Differential Signals +200mV to +5V (+2V typical) = clock on 200mV to 5V ( 2V typical) = clock off On to Off edge (falling edge) = receive data sample (bit center) Off to On edge (rising edge) = transmit data transition (bit edge) Most serial communications equipment uses the above clock polarity, but some non standard equipment may use the opposite polarity. For differential signals, the polarity can be altered by inverting the conductors of each clock signal pair.
7 Serial Interface Selection The serial adapter supports different interface types which are selected by placement of jumpers on the card. Each port has three rows of headers (pins sticking up from the card). Each row is labeled with a port number and an interface type (RS 232, V.35, RS 422/485). Place jumpers on the header row labeled with the desired interface type. The interface type must match that of the connected communications equipment. Interface selection is preset at the factory as specified by the ordering code. The selection may be changed by moving the jumpers to the desired header row as described above. Use pliers to remove the jumpers from the current position, carefully working the jumpers loose from the headers. Take care to not damage the card or cause injury. Some interface types require a conversion cable in addition to a specific jumper setting to provide the necessary connector type. Refer to the Serial Pin Assignments section for more details. Figure 2 Interface Selection Jumpers
8 Differential Input Termination Each port on the card has optional termination of RS 422/485 differential inputs. When a resistor pack is installed in the socket labeled TERM, all differential inputs for that port are terminated with 120 ohms. By default the termination resistor pack is installed for all ports. The presence of the termination resistor pack does not affect single ended (RS 232/V.28) inputs. Termination is used to increase signal reliability at high speeds (generally 1Mbps or more). At high speeds, receivers at each end of a cable should be terminated. For a multi drop setups (more than 2 devices on a cable), do not terminate receivers connected to the middle of the cable. At slower speeds, the termination can usually remain without problem. Removing termination at slower speeds may allow the use of longer cables. To remove a termination resistor pack, identify the socket labeled TERM. Then remove the yellow resistor pack from the black socket using a flat head screw driver or equivalent tool. Termination can be reinstalled by pressing the resistor pack back into the socket. Take care that the pins on the resistor pack are not bent and are firmly seated into the socket. Figure 3 Termination Sockets
9 Differential Fail Safe Biasing Fail safe biasing is a technique that guarantees differential input signals are in a steady state when not connected to an active differential output. Optional fail safe biasing of all differential inputs (RS 422/RS 485/V.11) for a port is available by installing a resistor pack in the socket labeled FAILSAFE. This resistor pack is not included by default with the hardware. Contact MicroGate sales to request fail safe resistor packs when ordering the hardware. Fail safe biasing is only used when an input is not constantly driven by an output, and that input is terminated (see previous section on differential input termination). When an input is not terminated, fail safe biasing integral to each receiver circuit maintains the input in a steady state. When an input is terminated, external fail safe biasing (resistor pack) may be required to guarantee the input is in a steady state. An example application that uses fail safe biasing is bus mode connections where a single cable conductor pair is connected to both the transmit data output and receive data input for more than one station. In this setup, only one output may be active at the same time and each output is only driven when sending data. When no station is sending, the external fail safe biasing maintains a voltage on the cable pair that keeps inputs in a steady state. WARNING: Fail safe biasing must be present on only a single station connected to a cable pair. This single station maintains the voltage on the cable to keep all connected inputs in a steady state. Applying fail safe biasing at multiple points on a cable may result in incorrect operation. Figure 4 Fail Safe Biasing Sockets
10 Serial Connector Pin Assignments The serial connectors on the end of each banch of the Y cable are DB 25 (25 pins) male connectors. The assignment of signals to the connector pins is controlled by the interface selection jumpers on the card. For interface types that use a connector different than DB 25 an adapter cable purchased from MicroGate is required. The following sections describe the jumper settings and cables for each supported standard.
11 RS 232 The RS 232 standard uses single ended signals on a DB 25 connector. The adapter DB 25 connector follows this standard when the port jumpers are installed for RS 232. Use any straight through 25 conductor DB 25M to DB 25F cable (such as MicroGate Part # CMF000) to connect the adapter connector to the communications equipment. The maximum data rate supported by the adapter when using RS 232 is 128Kbps. Cable length and signal loading may reduce the maximum usable data rate from this value. RS 232 DB 25 Male DTE Signal Name Electrical Desc Pin # Direction Earth/Shield Ground 1 TxD, Transmit Data RS 232/V.28 2 Output RxD, Receive Data RS 232/V.28 3 Input RTS, Request to Send RS 232/V.28 4 Output CTS, Clear to Send RS 232/V.28 5 Input DSR, Data Set Ready RS 232/V.28 6 Input Signal Ground 7 DCD, Data Carrier Detect RS 232/V.28 8 Input TxC, Transmit Clock RS 232/V Input RxC, Receive Clock RS 232/V Input LL, Local Loopback Control RS 232/V Output DTR, Data Terminal Ready RS 232/V Output RL, Remote Loopback Control RS 232/V Output RI, Ring Indicator RS 232/V Input AuxClk, DTE Clock Output RS 232/V Output Figure 5 RS 232 Cable (Part# CMF000)
12 V.35 The V.35 standard uses a mix of single ended and differential signals on a 34 pin block connector. To use this standard, install the V.35 jumpers on the port and use the MicroGate V.35 cable (Part # 2534GT, picture shown below). Note that the LL, RL, and RI signals are available on the adapter s DB 25 connector when the V.35 jumpers are installed, but are not available (NC = no connect) on the 34 pin block connector when using the V.35 cable. The maximum data rate supported by the adapter when using V.35 is 10Mbps. Cable length and signal loading may reduce the maximum usable data rate from this value. V.35 Male DTE Signal Name Electrical Desc DB25 Pin # V.35 Block Pin # Earth/Shield Ground 1 A Direction TxD (+/A), Transmit Data RS 422/V.11 2 P Output RxD (+/A), Receive Data RS 422/V.11 3 R Input RTS, Request to Send RS 232/V.28 4 C Output CTS, Clear to Send RS 232/V.28 5 D Input DSR, Data Set Ready RS 232/V.28 6 E Input Signal Ground 7 B DCD, Data Carrier Detect RS 232/V.28 8 F Input RxC ( /B), Receive Clock RS 422/V.11 9 X Input AuxClk ( /B), DTE Clock Output RS 422/V W Output TxC ( /B), Transmit Clock RS 422/V AA Input TxD ( /B), Transmit Data RS 422/V S Output TxC (+/A), Transmit Clock RS 422/V Y Input RxD ( /B), Receive Data RS 422/V T Input RxC (+/A), Receive Clock RS 422/V V Input LL, Local Loopback Control RS 232/V NC Output DTR, Data Terminal Ready RS 232/V H Output RL, Remote Loopback Control RS 232/V NC Output RI, Ring Indicator RS 232/V NC Input AuxClk (+/A), DTE Clock Output RS 422/V Output Figure 6 V.35 Cable (Part# 2534GT)
13 RS 422/RS 449/RS 485/RS 530 The RS 422 and RS 485 standards describe differential electrical signals but not connector or pin assignments. The RS 530 and RS 449 standards define specific connectors and pin assignments using differential signals. The differential signals on the card meet both RS 422 and RS 485 electrical specifications. RS 530 uses differential signals on a DB 25 connector. The adapter DB 25 connector follows this standard when the port jumpers are installed for RS 422/485. Use any straight through 25 conductor DB 25M to DB 25F cable (such as MicroGate Part # CMF000) to connect the adapter to RS 530 communications equipment. RS 449 uses differential signals on a DB 37 connector. To use this standard install the RS 422/485 jumpers for the port and use the MicroGate RS 449 cable (Part # 2537FM). The maximum data rate supported by the adapter when using RS 530 or RS 449 is 10Mbps. Cable length and signal loading may reduce the maximum usable data rate from this value. RS 422/RS 530/RS 449 Male DTE Signal Name Electrical Desc DB25 RS 530 Pin # Earth/Shield Ground 1 1 DB37 RS 449 Pin # Direction TxD (+/A), Transmit Data RS 422/V Output RxD (+/A), Receive Data RS 422/V Input RTS (+/A), Request to Send RS 422/V Output CTS (+/A), Clear to Send RS 422/V Input DSR (+/A), Data Set Ready RS 422/V Input Signal Ground 7 19 DCD (+/A), Data Carrier Detect RS 422/V Input RxC ( /B), Receive Clock RS 422/V Input DCD ( /B), Data Carrier Detect RS 422/V Input AuxClk ( /B), DTE Clock Output RS 422/V Output TxC ( /B), Transmit Clock RS 422/V Input CTS ( /B), Clear to Send RS 422/V Input TxD ( /B), Transmit Data RS 422/V Output TxC (+/A), Transmit Clock RS 422/V Input RxD ( /B), Receive Data RS 422/V Input RxC (+/A), Receive Clock RS 422/V Input LL, Local Loopback Control RS 232/V Output RTS ( /B), Request to Send RS 422/V Output DTR (+/A), Data Terminal Ready RS 422/V Output RL, Remote Loopback Control RS 232/V Output DSR ( /B), Data Set Ready RS 422/V Input DTR ( /B), Data Terminal Ready RS 422/V Output AuxClk (+/A), DTE Clock Output RS 422/V Output
15 X.21 X.21 is an interface standard using differential signals on a DB 15 connector. To use this standard, install the RS 422/485 jumpers on a port and use the MicroGate X.21 cable (Part # 2515FM). The X.21 signal names are different than those used by the adapter and other interface standards. The mapping of the X.21 signals to the adapter signals are shown in the table below. The maximum data rate supported by the adapter when using X.21 is 10Mbps. Cable length and signal loading may reduce the maximum usable data rate from this value. X.21 Male DTE Signal Name Electrical Desc DB25 Pin # Earth/Shield Ground 1 1 DB15 Pin # Direction T+, Transmit Data RS 422/V Output R+, Receive Data RS 422/V Input I+, Indicator (DSR/DCD) RS 422/V.11 6,8 5 Input Signal Ground 7 8 S, Clock Input (TxC, RxC) RS 422/V.11 9,12 13 Input I, Indicator (DSR/DCD) RS 422/V.11 10,22 12 Input X, Clock Output (AuxClk) RS 422/V Output T, Transmit Data RS 422/V Output S+, Clock Input (TxC, RxC) RS 422/V.11 15,17 6 Input R, Receive Data RS 422/V Input C+, Control (DTR) RS 422/V Output C, Control (DTR) RS 422/V Output X+, Clock Output (AuxClk) RS 422/V Output Figure 9 X.21 Cable (Part# 2515FM )
16 General Purpose I/O Signals The serial card has an optional 14 pin header that provides general purpose input/output (GPIO) signals for application specific uses. These signals are controlled by an application using the serial API (Windows and Linux). Each signal can be configured to be either an input or an output. Inputs can be monitored and outputs can be controlled. DC GPIO Specifications Vil (input low) = 0.5V min, 0.8V max Vih (input high) = 2.0V min, 5.5V max Vol (output low) = 0.4V max Voh (output high) = 2.4V min Iol (output low) = 24mA max Iil (output high) = 24mA max Input Current = +/ 10uA max GPIO signals are 3.3V TTL compatible and inputs are 5V tolerant.
17 GPIO Pin Assignments Pin # Description 1 Ground 2 GCK0 Dedicated special purpose LVTTL input Leave unconnected 3 GPIO 4 GPIO 5 GPIO 6 GPIO 7 GPIO 8 GPIO 9 GPIO 10 GPIO 11 GPIO 12 GPIO 13 GPIO 14 GPIO The GT adapter has a total of 12 general purpose I/O signals (GPIO to GPIO). By default on power up all GPIO signals are configured as inputs (direction control = 0). Refer to the serial API documentation for details on configuring and using GPIO signals. WARNING: Take care when connecting to GPIO signals to prevent damage to the serial card. Outputs should only be connected to inputs and not other outputs. Voltage limits as shown above should not be exceeded.
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