8
Chapter 3 Operating Instruction
3.1 Interface connection
3.1.1 Serial interface connection
The serial interface connection of SP-RMD8 is RS-232 interface, whose
electrical level is EIA and TTL optional. RTS/CTS and XON/XOFF handshaking
protocols are supported. The interface type is IDE20 pin type socket. The PIN
assignment showed in Picture3-1:
Picture 3-1 PIN assignment
When the electrical level of printer is TTL, the definition of pins is as showed
in Picture3-2:
Signal
name
Pin
No.
of
IDE20 Socket
Source
Explanation
RXD
20
Host
Printer receives data from host
TXD
19
Printer
Printer send data to host. When
X-ON/X-OFF
handshaking
protocol is used, printer send
Control code X-ON/X-OFF to host.
CTS
18
Printer
When data is 1high, it means
printer is too busy to receive data;
when data is 0 low, it means
printer is ready to receive data.
GND
2,6,8,12,16
-
Signal ground
Picture3-2 Definition of PIN assignment of serial interface
Содержание SP-RMD8
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