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Black Box Console Server user guide 140
Modems
Direct connections
Modems; example connections,
Notes:
1. At the modem, signal RXD is received data from the PSTN; signal TXD is
transmitted data to the PSTN.
2. In addition to the signals shown in the examples above, you may connect
Protective Ground (P/GND) if you have shielded twisted-pair (STP) cable.
Connect P/GND at either your equipment or the Black Box device (but not both).
P/GND will reduce interference in noisy environments.
Black Box device Modem
RS232 RJ45 DB25
RXD 6 <———————— 3 RXD
TXD 5 —————--—> 2 TXD
RTS 8 <———————— 5 CTS
CTS 7 —————--—> 4 RTS
DSR 2 —————--—> 20 DTR
S/GND 4 ———————- 7 S/GND
DCD 1 <———————— 8 DCD
DTR 3 <———————— 6 DSR