ADLINK Technology LitleBoard 800 Reference Manual

Contents

ADLINK Technology LitleBoard 800 Reference Manual Manual pdf 30 page image

Chapter 3 Hardware24 Reference Manual LittleBoard 800Table 3-6. Serial B Interface Pin/Signal Descriptions (J12)Pin # Pin #DB9Signal Description1 1(COM3)DCD3* Data Carrier Detect 3 – Indicates external serial communicationsdevice is detecting a carrier signal (i.e., a communication channel iscurrently open). In direct connect environments, this input will bedriven by DTR3 as part of the DTR/DSR handshake.2 6 DSR3* Data Set Ready 3 – Indicates external serial communications device ispowered, initialized, and ready. Used as hardware handshake withDTR3 for overall readiness to communicate.3 2 RXD3RX3-Receive Data 3 – Serial port 3 receive data inRX3- – If in RS485 or RS422 mode, this pin is Receive Data 3 -.4 7 RTS3*TX3+Request To Send 3 – Indicates Serial port 3 is ready to transmit data.Used as hardware handshake with CTS3 for low level flow control.TX3+ – If in RS485 or RS422 mode, this pin is Transmit Data 3 +.5 3 TXD3TX3-Transmit Data 3 – Serial port 3 transmit data outTX3- – If in RS485 or RS422 mode, this pin is Transmit Data 3 -.6 8 CTS3*RX3+Clear To Send 3 – Indicates external serial communications device isready to receive data. Used as hardware handshake with RTS3 for lowlevel flow control.RX3+ – If in RS485 or RS422 mode, this pin is Receive Data 3 -.7 4 DTR3* Data Terminal Ready 3 – Indicates this Serial port is powered,initialized, and ready. Used as hardware handshake with DSR3 foroverall readiness to communicate.8 9 RI3* Ring Indicator 3 – Indicates external serial communications device isdetecting a ring condition. Used by software to initiate operations toanswer and open the communications channel.9 5 GND Ground10 NC KEY Not Connected11 1(COM4)DCD4* Data Carrier Detect 4 – Indicates external serial communicationsdevice is detecting a carrier signal (i.e., a communication channel iscurrently open). In direct connect environments, this input will bedriven by DTR4 as part of the DTR/DSR handshake.12 6 DSR4* Data Set Ready 4 – Indicates external serial communications device ispowered, initialized, and ready. Used as hardware handshake withDTR4 for overall readiness to communicate.13 2 RXD4RX4-Receive Data 4 – Serial port 4 receive data inRX4- – If in RS485 or RS422 mode, this pin is Receive Data 4 -.14 7 RTS4*TX4+Request To Send 4 – Indicator to serial output port 4 is ready totransmit data. Used as hardware handshake with CTS4 for low levelflow control.TX4+ – If in RS485 or RS422 mode, this pin is Transmit Data 4 +.15 3 TXD4TX4-Transmit Data 4 – Serial port 4 transmit data outTX4- – If in RS485 or RS422 mode, this pin is Transmit Data 4 -.