ReadUSART 245
received data pin. See RX
ReceivedBytesThreshold 161
receiver. See specific interface
redirector software 39
reflections 117 – 120
registry, system 39
Remote NDIS 336
repeater, RS-485 141
request to send (RTS) 26 , 45 – 46
request to send. See RTS
resistor
biasing 127 – 131
in ground wire 137
terminating 85 – 87 , 114 – 125
resonator, ceramic 264
resources, COM port 36 – 37
RESPONSE_AVAILABLE notification 340 ,
344
Reynolds Electronics 148
RF
interfaces 152 – 154
regulations 149 – 150
unlicensed bands 150 – 151
ribbon cable 68
ring indicator (RI) 45 , 46
ring topology 125 – 127
ringing, on short line 122 – 123
rise time 107 , 111 – 112
RJ-11 63
RJ-45 63
RS-232
adapters 63 – 65
cable 67 – 68
chips 49 – 53
connectors 61 – 63
converters, RS-485 93 – 96
converters, TTL/CMOS 48 – 55
converting to USB 332 – 334
shield ground 46
short circuit and 46
signals 45
specifications 43 – 44
timing limits 48
voltages 46 – 47
vs. other interfaces 3 , 59
RS-422 80 , 81
RS-423 58 , 59
RS-485
advantages 79 – 80
biasing, line 127 – 131
cable 131 – 134
chips 89 – 90
connectors 134
converters, RS-232 93 – 96
converters, TTL/CMOS 91 – 96
current 85 – 87
driver enable 96 – 103
driver, selecting 111 – 112
fail safe 127
flow control and 80
FT232R and 326
full duplex circuit 91 – 92
guidelines 105
half duplex circuit 92 – 93
internal protection 88 – 89
isolation 137 – 139
multiple buses 141 – 143
network example circuit 281 – 283
PCs and 91
speed 87
termination 85 – 87
voltages 84 – 85
vs. other interfaces 3 , 80 , 81
RSR 231 , 258