Samsung SRP-350PG Service Manual - Page 20

-2-c Cable Connection, 5-2-d Signal Description

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2 Product Specifications 2-5 Interface Specifications 2-5-2-(c) Cable Connection PRINTER SIDE (S.G) 1,7 (SD2) 2 (SD1) 3 (RD2) 4 (RD1) 5 (DR2) 8 (DR1) 9 (CS2) 10 (CS1) 11 XX1 = XX+ XX2 = XX- 485 232 CONVERTER 1,7 (S.G) 2 (RD-) 3 (RD+) 4 (SD-) 5 (SD+) 8 (CS-) 9 (CS+) 10 (DR-) 11 (DR+) HOST SIDE 1,7 (S.G) 3 (RXD) 2 (TXD) 5 (CTS) 6 (DSR) 4 (RTS) 20 (DTR) Figure 2-8 RS-485 Cable Connection 2-5-2-(d) Signal Description Pin No. Signal Name Signal Direction Function BODY Frame GND - Frame Ground 2 SD2 3 SD1 Output Output Transmit Data "H" : SD1 > SD2, "L" : SD1 < SD2 4 RD2 Input Receive Data 5 RD1 Input "H" : RD1 > RD2 (RD1-RD2 0.2V), "L" : RD1 < RD2 (RD1-RD2 0.2V) 7 Signal GND 8 DR2 9 DR1 10 CS2 11 CS1 Output Input Signal Ground When DTR/DSR is selected, this signal indicates whether the printer is BUSY or READY. (H/W flow control) DR1 > DR2 (H) : The printer is BUSY. DR1 < DR2 (L) : The printer is READY. The host computer transmits a data to the host, after confirming this signal. When DTR/DSR is selected, this signal indicates whether the host computer is BUSY or READY. (H/W flow control) CS1 > CS2 (H) : The host computer is BUSY. CS1 < CS2 (L) : The host computer is READY. The printer transmits a data to the host, after confirming this signal. Table 2-14 RS-485 Pin Description 2-12 Samsung Electro-Mechanics

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2 Product Specifications
2-12
2-5 Interface Specifications
2-5-2-(c) Cable Connection
Figure 2-8 RS-485 Cable Connection
2-5-2-(d) Signal Description
Pin No.
Signal Name
Signal Direction
Function
BODY
Frame GND
-
Frame Ground
2
SD2
Output
3
SD1
Output
Transmit Data
“H” : SD1 > SD2,
“L” : SD1 < SD2
4
RD2
Input
5
RD1
Input
Receive Data
“H” : RD1 > RD2 (RD1-RD2
¹
0.2V),
“L” : RD1 < RD2 (RD1-RD2
º
0.2V)
7
Signal GND
-
Signal Ground
8
9
DR2
DR1
Output
When DTR/DSR is selected, this signal indicates whether the printer is BUSY or
READY. (H/W flow control)
±
±
DR1 > DR2 (H) : The printer is BUSY.
²
±
DR1 < DR2 (L) : The printer is READY.
¸
±
The host computer transmits a data to the host, after confirming this signal.
10
11
CS2
CS1
Input
When DTR/DSR is selected, this signal indicates whether the host computer is
BUSY or READY. (H/W flow control)
±
±
CS1 > CS2 (H) : The host computer is BUSY.
²
±
CS1 < CS2 (L) : The host computer is READY.
¸
±
The printer transmits a data to the host, after confirming this signal.
Table 2-14 RS-485 Pin Description
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(S.G)
1,7
(SD2)
2
(SD1)
3
(RD2)
4
(RD1)
5
(DR2)
8
(DR1)
9
(CS2)
10
(CS1)
11
1,7 (S.G)
2 (RD-)
3 (RD+)
4 (SD-)
5 (SD+)
8 (CS-)
9
(CS+)
10 (DR-)
11 (DR+)
PRINTER
SIDE
485
µ
232
CONVERTER
XX1 = XX+
XX2 = XX-
1,7
(S.G)
3
(RXD)
2
(TXD)
5
(CTS)
6
(DSR)
4
(RTS)
20 (DTR)
HOST
SIDE
Samsung Electro-M
e
chanics