| UNIT 3: INSTALLATION - LESSSON 5: OPTIONAL ACCESSORIES RS-232 Connections The Main Unit comes equipped with a 9-pin RS-232C serial port. A serial device such as a printer or computer that can print or store data can be connected to this port. The RS-232C port provides Station Message Detail Recording (SMDR) information. Station Message Detail Recording is a print out of calls that are being made or received by the users of the system. A line item on the printout is generated for each incoming or outgoing call. Information such as the date, time, extension, CO, number dialed, duration, and any condition code which may apply will be provided for each call. Other detailed system information that can be printed include intercom calls received, extension log-in/log out status and system error/alarm information. An inexpensive serial printer can be attached and paper printout generated or, a Personal Computer (PC) with a serial port could be connected. If a computer is utilized, it needs to have communication software or Call Accounting software installed. Any of these devices can be used depending on the needs of the customer. A serial cable needs to be attached between the RS-232C port of the Main Unit and the collection device. The cable needs to be a serial cable with a female DB-9 connector on one end. The 9-pin end will be connected to the Main Unit. The other end will either be a 9-pin or 25-pin connector depending on the printer or PC being utilized. Cables can be purchased at telecommunication distributors or at electronic or computer stores like Radio Shack. In addition to the serial cable, a null modem adapter is required. Null modem adapters are used to configure the serial cable providing communication between the Main Unit and the printer or PC. Connect the serial cable between the RS-232 port of the Main Unit and the RS-232 port of the collection device using the pin-outs in the tables below. Then set the communications parameters between the two devices if necessary.