Cable drawing:
| RS422 Serial Port Cable | ||||
| FEMALE cable plug
mates with RS422 25 Pin Male Connector |
MALE cable plug
mates with AMI J3 DB9 Pin Female Connector |
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| DB25 pin | Signal | Direction | J3 pin | Signal |
| 19 | TD(A) | IN to BTR | 1 | RX+ |
| 25 | TD(B) | IN to BTR | 4 | RX- |
| 7 | FR.GND | - | 5 | GND |
| 15 | RD(A) | OUT of BTR | 6 | TX+ |
| 17 | RD(B) | OUT of BTR | 9 | TX- |