Intergraph InterServe 800 SL System Reference Manual page 86

74
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
Universal Serial Bus 1 and 2
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.
B
A
2
The Serial ports (also referred to as RS-232 asynchronous communications
1
5
4
1
1 4
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
Pin Signal
A1 PWR
A2 -
A3 +
A4 Ground
Pin Signal
B1 PWR
B2 -
B3 +
B4 Ground