Black Box MDR24x, User Manual

Page: 8 / 19

MDR24X User’s Manual
10/26/2006 8
RS-232 Pin Assignments
Figure 2- MDR242A Back View
RS-485 (2-wire Half Duplex) Terminal Block Pin Assignments
Figure 3- MDR244A Back View
Note: Standard power is applied through the power connector. Alternative power is available via
the terminal block pins.
Pin Description
Input /
Output
1 DCD O
2 TxD O
3 RxD I
4 DSR O
5 GND
6 DTR I
7 CTS O
8 RTS I
9 RI O
Pin Description
1 VCC (6 –18V)(125 mA max)
2 485- (485B)
3 No Connect
4 No Connect
5 485+ (485A)
6 GND
1 6
Power Connector
Terminal Block
Power Connector DB9 Male Connector
1 5
6 9