Epson EPL-N1200, Service Manual

Page: 30 / 149

1.3.2 Optional Serial Interface (LocalTalk/Serial Module)
The optional LocalTalk/Serial module contains serial interface with the following characteristics.
Type: RS-232C or current loop
Transfer system: Full duplex
Synchronization: Asynchronous start-stop system
Start-bit: 1 bit
Stop-bit: 1 or 2 bits
Data length: 7 bits or 8 bits
Parity: Odd, even, or none
Protocol: X-ON/X-OFF (can be combined with DTR control)
DTR control (can be combined with X-ON/X-OFF)
Transfer speed: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, or 57600 BPS
Note 1: For RS-232C signal level, speeds of 38400 BPS and above place restrictions on the host
computer, cable, and other operating conditions.
Note 2 For current loop signal level, speeds of 2400 BPS and above place restrictions on the
host computer, cable, and other operationg conditions.
Error: Overrun error: Processed as missing data and replaced by “*”
Parity error: Replaced by “*”
Framing error: Replaced by “*”
Breaking character: Ignored
Applicable plug Circular miniature DIN 8-pin plug
Signal Level
(EIA BASED) : TXD, DTR
Out put Voltage (VOH) 5 to 15 V
(VOL) -5 to -15 V
Open circuit voltage (VO) 15 V
Impedance with power off (rO) 300 ohms (MIN.)
Load capacitance (CL) 2500 pF (MAX.)
Through rate 30 V/u SEC (MAX.)
Load resistance (Lo) 3 K to 7 K ohms
RXD, CTS
Input Voltage (VIH) 3 V (MIN.)
(VIL) -5 V (MIN.)*1)
Input signal range +25 V (MAX.)*1)
Input impedance (RI) 3 K to 7 K ohms
Imput current (II) + 8 mA (MAX)*1)
Open-circuit input voltage (EL) -2 V (MAX>)*1)
Note : Annotations “MIN”. and “MAX.” apply to absolute values.
Signal descriptions: See Table 1-10.
General Description EPL-N1200 Service Manual
1-18 Rev. A