Epson LQ-2500 User Manual - Page 158
Identifying a serial interface board, Choosing and Setting Up Optional Interfaces
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Three Epson serial interfaces are suitable for LQ printers. All three offer a choice of 7-bit or g-bit data, and support Current Loop operation in addition to RS-232C. They also offer a choice of other features, which are listed in Table F-2. Table F-2. Send interface X-on/X-off control Self test Built-In data buffer #a143 yes no none #al45 no loopback 2K #al48 yes loopbackl line monitor 218K X-on/X-off protocol is a system in which the printer transmits a code to the computer to indicate that it cannot accept more data, and a second code when it is once more ready The loopback self-test mode allows direct testing of the functions of the interface without connecting a computer; line monitor mode is rather like the LQ data dump mode. Identifying a serial interface board All Epson interfaces have the EPSON name printed on them. If the board has an identification code printed on it, it will be a four digit number beginning with an eight. The number should be one of the numbers in Table F-3. If the board has no identification code, or if you are unsure whether the number you have located is the correct code, check the number of DIP switches on the board against Table F-3. Table F-3. Number of DIP switches Choosing and Setting Up Optional Interfaces F-3