By Sweet M.R.
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Input available) exists on the file descriptor. In the previous example you could specify the process_fd or process_socket functions. Because Xt limits your access to the select system call, you'll need to implement timeouts through another mechanism, probably via XtAppAddTimeout(3x). 30 Using SELECT with the X Intrinsics Library Appendix A, Pinouts This appendix provides pinout information for many of the common serial ports you will find. Appendix A, Pinouts 31 Serial Programming Guide for POSIX Operating Systems RS−232 Pinouts RS−232 comes in three flavors (A, B, C) and uses a 25−pin D−Sub connector: Figure 2 − RS−232 Connector Table 12 − RS−232 Signals Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 32 Description Earth Ground TXD − Transmitted Data RXD − Received Data RTS − Request To Send CTS − Clear To Send DSR − Data Set Ready GND − Logic Ground DCD − Data Carrier Detect Reserved Reserved Unassigned Secondary DCD Secondary CTS Pin 14 15 16 17 18 19 20 21 22 23 24 25 Description Secondary TXD Transmit Clock Secondary RXD Receiver Clock Unassigned Secondary RTS DTR − Data Terminal Ready Signal Quality Detect Ring Detect Data Rate Select Transmit Clock Unassigned RS−232 Pinouts Serial Programming Guide for POSIX Operating Systems RS−422 Pinouts RS−422 also uses a 25−pin D−Sub connector, but with differential signals: Figure 3 − RS−422 Connector Table 13 − RS−422 Signals Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 Description Earth Ground TXD− − Transmitted Data RXD− − Received Data RTS− − Request To Send CTS− − Clear To Send DSR − Data Set Ready GND − Logic Ground DCD− − Data Carrier Detect Reserved Reserved Unassigned DCD+ CTS+ Pin 14 15 16 17 18 19 20 21 22 23 24 25 Description TXD+ Transmit Clock− RXD+ Receiver Clock− Unassigned RTS+ DTR− − Data Terminal Ready Signal Quality Detect Unassigned DTR+ Transmit Clock+ Receiver Clock+ RS−574 (IBM PC/AT) Pinouts The RS−574 interface is used exclusively by PC manufacturers and uses a 9−pin male D−Sub connector: Figure 4 − RS−574 Connector Table 14 − RS−574 (IBM PC/AT) Signals Pin 1 2 3 4 5 RS−422 Pinouts Description DCD − Data Carrier Detect RXD − Received Data TXD − Transmitted Data DTR − Data Terminal Ready GND − Logic Ground Pin 6 7 8 9 Description Data Set Ready RTS − Request To Send CTS − Clear To Send Ring Detect 33 Serial Programming Guide for POSIX Operating Systems SGI Pinouts Older SGI equipment uses a 9−pin female D−Sub connector.
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Serial programming guide for POSIX operating systems by Sweet M.R.
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