23
APPENDIX: Interface Standards
EIA-530 INTERFACE (DB25)
1 - (FG) Frame Ground
2 - Transmit Data A
3 - Receive Data A
4 - (RTS) Request to Send
5 - (CTS) Clear to Send
6 - (DSR) Data Set Ready
7 - (SG) Signal Ground
8 - (CD) Carrier Detect
9 - Receive Clock B
11 - External Clock B
12 - Transmit Clock B
Transmit Data B - 14
Transmit Clock A - 15
Receive Data B - 16
Receive Clock A - 17
Data Term Ready (DTR) - 20
External Clock A - 24
CCITT X.21 INTERFACE (DB15)
1 - Frame Ground
2 - Transmit - A
3 - Control - A
4 - Receive - A
5 - Indication - A
6 - Signal Timing - A
8 - Signal Ground
Transmit - B - 9
Control - B - 10
Receive - B - 11
Indication - B - 12
Signal Timing - 13
Appendix. Interface Standards
MT246A
MT245A
