Blackbox PI320A-R3, Manual, Page: 10 / 22

8
DISTANCE EXTENDERS
J2—DB25 Female RS-232
DCE Interface Function DTE Interface Function
Pin/Signal (S1-A) (S1-B)
2 Transmitted Data Input Output
3 Received Data Output Input
4 Request To Send Connected to pin 5 Connected to pin 5
5 Clear To Send Connected to pin 4 Connected to pin 4
6 Data Set Ready Output Input
7 Common Ground Ground
8 Data Carrier Detect Open Open
9 + (optional) 7 to 12 VDC @ 250 mA 7 to 12 VDC @ 250 mA
20 Data Terminal Ready Input Output
22 Ring Indicator Open Open
DCE stands for Data Carrier Equipment (can connect to a PC).
DTE stands for Data Terminal Equipment (configured the same as a PC).
NOTE
The Serial Line Extender may be powered with either Jack J1 or pin 9
of Jack J2.
J3—RJ-11 (6-position 6-conductor)
Input Device Transmit Output Device Receive
Position Function (S2-5 UP) (S2-5 DOWN)
1 Unused No connection No connection
2 Pair 2+ R Tr
3 Pair 1+ Tr
4 Pair 1- Transmit- Receive-
5 Pair 2- Receive- Transmit-
6 Unused No connection No connection