Samsung SRP-350PG - SRP 350 B/W Direct Thermal Printer Service Manual page 18

2 Product Specifications
2-5 Interface Specifications
2-5-1-(c) Cable Connection
PRINTER
SIDE(25P)
(S.G) 1
(TXD) 2
(RXD) 3
(DSR) 6
(DTR) 20
(S.G) 7
2-5-1-(d) Signal Description
Pin No. Signal Name
BODY Frame GND
2 TXD
3 RXD
4 RTS
5 CTS
6 DSR
7 Signal GND
20 DTR
Note : Refer to the Operation Manual about the busy condition.
2-10
HOST
SIDE(25P)
1 (S.G)
2 (TXD)
3 (RXD)
4 (RTS)
5 (CTS)
6 (DSR)
20 (DTR)
7 (S.G)
Figure 2-7 RS-232C Cable Connection
Signal Direction
- Frame Ground
Output Transmit Data
Input Receive Data
Outnput Ready To Send
Input Clear To Send
This signal indicates whether the host computer can receive data. (H/W flow control)
MARK(Logic1) : The host can receive a data.
Input
SPACE(Logic0) : The host can not receive a data
The printer transmits a data to the host, after confirming this signal.
When XON/XOFF flow control is selected, the printer does not check this signal
- Signal Ground
This Signal indicates whether the printer is busy. (H/W flow control)
MARK(Logic1) : The printer is busy
Output
SPACE(Logic0) : The Printer is not busy
The host transmits a data to the printer, after confirming this signal.
When XON/XOFF flow control is selected, the host does not check this signal.
Table 2-12 RS-232C Pin Description
PRINTER
SIDE(25P)
(S.G) 1
(TXD) 2
(RXD) 3
(DSR) 6
(DTR) 20
(S.G) 7
Function
Samsung Electro-Mechanics
HOST
SIDE(9P)
1 (S.G)
3 (TXD)
2 (RXD)
7 (RTS)
8 (CTS)
6 (DSR)
4 (DTR)
5 (S.G)
.