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BASE+4 Modem Control Register (MCR)
bit 0 DTR
bit 1 RTS
BASE+5 Line Status Register (LSR)
bit 0 Receiver data ready
bit 1 Overrun error
bit 2 Parity error
bit 3 Framing error
bit 4 Break interrupt
bit 5 Transmitter holding register empty
bit 6 Transmitter shift register empty
bit 7 At least one parity error, framing error or break indication
in the FIFO
BASE+6 Modem Status Register (MSR)
bit 0 Delta CTS
bit 1 Delta DSR
bit 2 Trailing edge ring indicator
bit 3 Delta received line signal detect
bit 4 CTS
bit 5 DSR
bit 6 RI
bit 7 Received line signal detect
BASE+7 Temporary data register
Appendix B Safety Instructions
1.Please read these safety instructions carefully.
2.Please keep this User's Manual for later reference.
3.Please disconnect this equipment from AC outlet before cleaning. Don't use liquid or sprayed
detergent for cleaning. Use moisture sheet or cloth for cleaning.
4.For pluggable equipment, the socket-outlet shall be installed near the equipment and shall be
easily accessible.
5.Please keep this equipment from humidity.
6.Lay this equipment on a reliable surface when install. A drop or fall could cause injury.
7.The openings on the enclosure are for air convection hence protect the equipment from
overheating. DO NOT COVER THE OPENINGS.
8.Make sure the voltage of the power source when connect the equipment to the power outlet.
9.Place the power cord such a way that people can not step on it. Do not place anything over the
power cord.
10.All cautions and warnings on the equipment should be noted.
11.If the equipment is not used for a long time, disconnect the equipment from mains to avoid
being damaged by transient overvoltage.
12.Never pour any liquid into opening, this could cause fire or electrical shock.
13.Never open the equipment. For safety reason, the equipment should only be opened by
qualified service personnel.
14.If one of the following situations arises, get the equipment checked by a service personnel:
a: The power cord or plug is damaged.
b. Liquid has penetrated into the equipment.
c. The equipment has been exposed to moisture.
d. The equipment does not work well or you can not get it to work according to user's manual.