ASEM SR 85, Service Manual

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2.5 Interface Specification
2.5.1 RS-232C Serial Interface
2.5.1.1 RS-232C Specification
Item Description Remark
Data Transmission 
Serial
Synchronization 
Asynchronous
Hand Shaking
(Flow Control)

H/W : DTR / DSR

S/W : XON / XOFF
XON : ASC Code 11h
XOFF : ASC Code 13h
Signal Level

Logic”1” (MARK) : -3V ~ -15V

Logic”0” (SPACE) : +3V ~ +15V
Baud Rate

2400 / 4800 / 9600 / 14400 / 19200 / 38400 / 57600 / 115200 bps
Default 115200 bps
Data Word Length 
7 Bit / 8 Bit
Parity 
None / Even / Odd
Connector 
DB25P Female / DB9P Female / RJ45 Modular Jack (I/F PBA)
The Hand Shaking(Flow Control) / Baud Rate / Data Word Length / Parity functions depend on the DIP switch settings. Refer to “Chap. 3.2.”
2.5.1.2 RS-232C(DSUB25) Signal Description
PIN NO
DSUB25(Female)
Signal Name Direction Function
3 RXD IN Receive Data
2 TXD OUT Transmit Data
20 DTR OUT Data Set Ready
7 GND - -
6 DSR IN Data Terminal Ready
4 RTS OUT Request To Send
5 CTS IN Clear To Send
13
25
1
14
( EXPLODED VIEW )
SR 85 - Service Manual