Understanding RS232 Communications
Page A-2 Mastertech 3100 Operator’s Manual
RS232 INTERFACE SIGNALS
PIN
NUMBER
SIGNAL NAME INPUT/OUTPUT CONNECT TO:
1 NOT USED
2 DTR OUTPUT DSR
3 CARRIER DETECT INPUT CARRIER DETECT
4 CTS
a
a. CTS and RTS are connected together inside the tester, but are not used as handshake signals by the tester.
RTS
5 TRANSMIT OUTPUT RECEIVE
6 RECEIVE INPUT TRANSMIT
7 RTS
a
CTS
8 SIGNAL GROUND SIGNAL GROUND
9 DSR INPUT DTR
10 NOT USED
SIGNAL LEVELS DATA FORMAT BAUD RATES
LOGIC “1” - 12 V 1 START BIT
LOGIC “0” +12 V 8 DATA BITS
1 START BIT
8 DATA BITS
1 STOP BIT
NO PARITY
SOFTWARE
SELECTABLE:
1200 bps
2400 bps
4800 bps
9600 bps
19200 bps
38400 bps
57600 bps
115200 bps
TABLE A-1. RS232 Interface Specifications
PIN 1 PIN 10
FIGURE A-1. RS232 Socket on Tester
RJ45 10-Pin Modular Phone Connector
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