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Interface Connector
Serial Interface(RS-232C)
Pin No. Signal name Direction Function
1 FG - Frame Ground
2 TxD Output Transmit Data
3 RxD Input Receive Data
6 DSR Input Data Set Ready
7 SG - Signal Ground
20 DTR Output Data Terminal Ready
Serial Communication Interface(Example)
Printer Host(DTE ex 8251)
SG SG
TXD TXD
RSD RSD
DSR RTS
DTR CTS
DSR
DTR
S.G S.G
Serial Interface(RS-485)
Pin No.
Signal Name Direction Function
1 FGND - Frame Ground
2 SD2 Output
3
SD1 Output
Send Data
4 RD2 Input
5 RD1 Input
Receive Data
7 SGND - Signal Ground
8
9
DR2
DR1
Output Same as DTR(RS-232)
10
11
CS2
CS1
Input Same as DSR(RS-232)