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Epson Serial Interface GQ-3500 User Manual
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Epson Serial Interface GQ-3500 User Manual

Epson Serial Interface GQ-3500 User Manual

Epson serial interface user manual
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®
EPSON

Serial Interface

for the
G Q - 3 5 0 0
Printed in Japan
Y59099101000

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Summary of Contents for Epson Serial Interface GQ-3500

  • Page 1: Serial Interface

    ® EPSON Serial Interface for the G Q - 3 5 0 0 Printed in Japan m 88.11-5 Y59099101000...

  • Page 2: Setting Up The Serial Interface

    Serial Interface The serial interface is an option for your CQ-3500 printer. These pages tell you how to install and use the serial interface. The GQ-3500 serial interface is actually two interfaces in one. It can be used as either an RS-232C interface (the factory setting) or an RS-422 interface, depending on the settings of the jumpers on the circuit board.
  • Page 3 For RS422 operation, set the jumpers at Jl and J2 as follows. At Jl, move REV, RD, and SRI to the right. At J2, set all jumpers in the installed position, except for TR+ and TR-. Jumpers that were not given a especific setting above do not need to be changed to select RS-232C or RS-422 operation (although they may affect how the interface works).
  • Page 4 Configure the jumpers on the serial interface card as described above. Remove the parallel interface from the back of the printer by loosening the two Knobs and pulling its straight out as shown in Figure 1. Store the parallel in the box that the serial interface came in Figure 1.
  • Page 5 T h e S e r i a l I n t e r f a c e D I P S w i t c h e s On the right side of the serial interface are two banks of DIP switches, as shown in Figure 2.
  • Page 6 Table 1. Serial interface DIP switches Serial Interface...
  • Page 7 Setting the data trader rate The following table shows the DIP switch settings for the various possible data transfer (baud) rates Table2. Baud rate settings The Serial Interface Jumpers The following tables describe the functions of the jumpers on the serialinterface.
  • Page 8 The jumpers at Jl The jumpers at J1 are two position jumpers. The small plugs can be moved from the left two wires to the right two wires to change the Table 3 describes the functions of the jumpers at Jl. When settings.

  • Page 9: Communications Protocols

    at J2 The jumpers Jumpers at J2 are single position jumpers; they can be either installed or disconnected. To change the settigs of these jumpers you must put a jumper plug across the two pins. To disconnect a jumper plug, simply move the plug so that it right pin open.
  • Page 10 The GQ-3500 has a buffer that will hold up to 102 characters, including the ETX code at the end of the group. The computer can send the first group of characters and then stop until the first ACK is received. From then on,every time an ACK is received, another group of characters can be sent.
  • Page 11 1. When the input buffer becomes nearly full (within 128 bytes) When the pinter goes off line (by pressing the ON LINE button) When the printer runs out of paper When the printer runs out of toner 5. When an error is detected. when the DTR signal goes low, the computer musts stop sending data within 128 characters The signal goes back high when the buffer has room for 255 Characters.
  • Page 12 Pins and signals Table5. Serial Interface...
  • Page 13 Table 5. Continued Serial Interface...