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PMAC VME Hardware Reference Manual
J4 JRS422 (26-Pin Connector)
Pin #
1
Symbol
CHASSI
Function
Common
Description
PMAC Common
Front View
Notes
Deactivated by E8 2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
S+5V
RD-
RD+
SD-
SD+
CS+
CS-
RS+
RS-
DTR
INIT/
GND
DSR
SDIO-
SDIO+
SCIO-
SCIO+
SCK-
SCK+
SERVO-
SERVO+
PHASE-
PHASE+
GND
+5V
Output
Input
Input
Output
Output
Input
Input
Output
Output
Bidirectional
Input
Common
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Common
Output
+5VDC Supply
Receive Data
Receive Data
Send Data
Send Data
Clear to Send
Clear to Send
Request to Send
Request to Send
Data Terminal Ready
PMAC Reset
PMAC Common
Data Set Ready
Special DATA
Special Data
Special CTRL.
Special CTRL.
Special Clock
Special Clock
Servo Clock
Servo Clock
Phase Clock
Phase Clock
PMAC Common
+5VDC Supply
Diff. I/O low true **
Diff. I/O high true *
Diff. I/O low true **
Diff. I/O high true *
Diff. I/O high true **
Diff. I/O low true *
Diff. I/O high true **
Diff. I/O low true *
Tied to DSR
Low is Reset
Low is Reset
Tied to DSR
Diff. I/O low true
Diff. I/O high true
Diff. I/O low true
Diff. I/O high true
Diff. I/O low true
Diff. I/O high true
Diff. I/O low true ***
Diff. I/O high true ***
Diff. I/O low true ***
Diff. I/O high true ***
Power supply out
The JRS422 connector provides the PMAC with the ability to communicate both in RS422 and RS232. In addition, this connector is used to daisy chain interconnect multiple PMACs for synchronized operation.
* Note: Required for communications to an RS-422 host port
** Note: Required for communications to an RS-422 or RS-232 host port
*** Note: Output on card @0; input on other cards. These pins are for synchronizing multiple PMACs together by sharing their phasing and servo clocks. The PMAC designated as card 0 (@0) by its jumpers E40-E43 outputs its clock signals. Other PMACs designated as cards 1-15 (@1-@F) by their jumpers E40-E43 take these signals as inputs. If synchronization is desired, these lines should be connected even if serial communications is not used.
See Also:
Serial Communications
Synchronizing PMAC to other PMACs
22 PMAC VME Connector Pinouts
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