PMAC Product Guide J4A (JRS422): Serial Port Connector Machine Connections 37 J4A JRS422 (26-Pin Connector) Front View Pin # Symbol Function Description Notes 1 CHASSI COMMON PMAC Common 2 S+5V OUTPUT +5Vdc Supply Deactivated by E8 3 RD- INPUT Receive Data Diff. I/o low true ** 4 RD+ INPUT Receive Data Diff. I/o high true * 5 SD- OUTPUT Send Data Diff. I/o low true ** 6 SD+ OUTPUT Send Data Diff. I/o high true * 7 CS+ INPUT Clear to Send Diff. I/o high true ** 8 CS- INPUT Clear to Send Diff. I/o low true * 9 RS+ OUTPUT Req. to Send Diff. I/o high true ** 10 RS- OUTPUT Req. to Send Diff.
I/o low true * 11 DTR BIDIRECT Data Term Ready Tied to DSR 12 INIT/ INPUT PMAC Reset Low is reset 13 GND COMMON PMAC Common ** 14 DSR BIDIRECT Data Set Ready Tied to DTR 15 SDIO- BIDIRECT Special Data Diff. I/O low true 16 SDIO+ BIDIRECT Special Data Diff. I/O high true 17 SCIO- BIDIRECT Special Ctrl. Diff. I/O low true 18 SCIO+ BIDIRECT Special Ctrl. Diff. I/O high true 19 SCK- BIDIRECT Special Clock Diff. I/O low true 20 SCK+ BIDIRECT Special Clock Diff. I/O high true 21 SERVO- BIDIRECT Servo Clock Diff. I/O low true *** 22 SERVO+ BIDIRECT Servo Clock Diff. I/O high true *** 23 PHASE- BIDIRECT Phase Clock Diff. I/O low true *** 24 PHASE+ BIDIRECT Phase Clock Diff.
I/O high true *** 25 GND COMMON PMAC Common 26 +5V OUTPUT +5Vdc Supply Power supply out The JRS422 connector provides the PMAC with the ability to communicate both in RS422 and RS232. Jumpers E107 and E108 must connect pins 2 and 3 to use this port. * Note: Required for communications to an RS-422 host port ** Note: Required for communications to an RS-422 or RS-232 host port *** Note: These lines are used for an advanced feature and normally should not be connected.