Db25 Direct Connection To Hp 3000 Atp Ports (3-Pin Connector); Db25 Direct Connection To Hp 9000 With A Ddp Db25 - HP A4500A - VMEbus Single Board Computer 744 Motherboard Manual

RS-232 DB25 Direct connection to HP 3000 ATP ports (3-pin connector)
This cabling scheme is recommended for connecting to HP 3000 ATP ports with
3-pin connectors.
RS-232 DB25 Direct connection to HP 9000 with a DDP DB25
This cabling scheme is recommended for connecting to HP 9000 with sub-D25-pin
connectors.
25-pin male connector to DTC
-
1 - PGND
INPUT
2 - RD
OUTPUT
3 - TD
-
7 - SGND
OUTPUT
8 - RTS
22 - CTS
INPUT
25-pin male connector to DTC
-
1 - PGND
INPUT
2 - RD
OUTPUT
3 - TD
-
7 - SGND
OUTPUT
8 - RTS
22 - CTS INPUT
RS-232 connection
3-pin male connector to ATP
OUTPUT
3 - ATP TD
INPUT
2 - ATP RD
-
1 - ATP SGND
DDP 25-pin male connector to HP 9000
-
1 - DDP PGND
OUTPUT
3 - DDP TD
2 - DDP RD INPUT
-
7 - SGND
7
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