Intergraph InterServe 80 SL System Reference Manual page 72

60
Universal Serial Bus
The Universal Serial Bus (USB) port connects USB devices to the computer. These
devices can include printers, keyboards and other peripherals that have historically used
serial, parallel, mouse, and keyboard I/O buses. USB devices, designed to be fully Plug-and-
Play (PnP), feature hot attach/detach and daisy-chain capabilities. The USB port can
transfer data at a maximum theoretical rate of 12 megabits per second.
1
B
A
1
Serial
1
ports, or COM ports) connect modems, printers, peripherals, and other computers to the
system. The serial ports (labeled 1 and 2) are 9-pin, male DB9 connectors. If connecting a
serial device with a 25-pin DB25 connector, use a 25-pin to 9-pin adapter cable to mate with
the serial port on the system. Use only shielded cables with the serial ports.
6
9
4
Pin
A1
A2
A3
A4
4
2
The Serial ports (also referred to as RS-232 asynchronous communications
1
5
Signal Pin
PWR B1
- B2
+ B3
Ground B4
Pin Signal
1 DCD - Data Carrier Detect
2 RD - Receive Data
3 TD - Transmit Data
4 DTR - Data Terminal Ready
5 Ground
6 DSR - Data Set Ready
7 RTS - Request to Send
8 CTS - Clear to Send
9 RI - Ring Indicator
Signal
PWR
-
+
Ground