1.4.6.1 - Norsk Data printer - Epson

Description

• The Epson RS-232 interface for LX-80 and LX-86 printers. It has a built-in 2 KB data buffer and both hardware and software (XON/XOFF) handshake.
• Using 1 piece of SRAM chip for system memory/data buffer (version A), 8192 x 8 bits x 1 piece (total 8 KB).
• Using 1 piece of SRAM chip for system memory/data buffer (version B), 2048 x 8 bits x 1 piece (total 2 KB).
• PCB size 100 x 120 mm, 2 layers
• Release date 02. Nov. 1985

Chipset

• Version A
  • PROM 4FIF
  • NEC μPD7810
  • D4364 or
    HM6264 - SRAM
• Version B
  • PROM 0IFA
  • NEC D8035
  • HM6116 - SRAM

LEDs

• None

Straps

• Various straps placed around on the PCB

  Strap	On	Off	Functions
  J1	On	Off	On: Pull up TTY-TXD to +12V via 470-ohm resistor
  J2	On	Off	On: Connect TTY-TXD Return to signal ground
  J3	On	Off	On: Connect TTY-TXD Return to signal ground
  J4	On	Off	On: Pull up TTY-TXD to +12V via 470-ohm resistor
  J5	On	Off	On: Pull up DSR to +12V
  J6	On	Off	On: Pull up DCD to +12V
  J8A	On	Off	On: Do not send X-ON/X-OFF signal
  J8B	On	Off	On: Send X-ON/X-OFF signal
  JX	On	Off	On: X-ON/X-OFF control is used for handshaking in Current Loop mode
  JF	On	Off	On: Flag control is used for handshaking in Current Loop mode
  JCL	On	Off	On: Receive data in Current Loop mode
  JRS	On	Off	On: Receive Data in RS-232C mode

Switches

• Switch 1

  No. On Off Functions 1-1 7 bits 8 bits Word length 1-2 Enable Disable Parity check 1-3 Even Odd Parity selection 1-4 Negative Positive Flag negative/positive polarization 1-5 see below Bit rate selection 1-6 1-7 1-8

  1-5 1-6 1-7 1-8 Bit rate (BPS) On On On On 75 On On On Off 110 On On Off On 134.5 On On Off Off 150 On Off On On 200 On Off On Off 300 On Off Off On 600 On Off Off Off 1200 Off On On On 1800 Off On On Off 2400 Off On Off On 4800 Off On Off Off 9600 Off Off On On 19200 Off Off On Off 19200 Off Off Off On 19200 Off Off Off Off 19200

  
  
• Switch 2

  No. On Off Functions 2-1 Enable Disable I/F board enable/disable 2-2 Enable Disable Buffer operation 2-3 see below Flag reset timing 2-4 2-5 Enable Disable Self-test enable/disable (version A only) 2-6 Line monitor Loopback Self-test mode selection (version A only)

  2-3 2-4 Vacant bytes Off Off 216 Off On 352 On Off 624 On On 1936

Connectors

• Standard Serial (RS-232) DB25 connector
• Connector for the main PCB inside the printer