Turbo PMAC2 PCI Ultralite HRM
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Connector PinOuts
7
J5: (RS-232) Serial Port
The J5 (RS-232) connector can be used as a primary communication mean or employed as a secondary
port that allows simultaneous communication alongside PCI.
J5 can also be used to share phase and servo clocks between two or more PMAC cards. The J5A (RS-422)
allows communication interconnection of multiple PMACs.
Caution
Pin #1 should NOT be connected if serial communication to the Turbo
PMAC2 PCI Ultralite using J5 is tied to a modem style terminal
emulator such as Microsoft Windows Terminal.
J5: 10-pin IDC header (M)
Mating: 10-pin IDC header (F)
Front view
1
3
5
7
9
2
4
6
8
10
Pin#
Symbol
Function
Description
Notes
1
PHASE
In/Out
Phase Clock
2
DTR
Bidirect
Data Terminal Ready
Tied to "DSR"
3
TXD/
Output
Receive Data
Host transmit data
4
CTS
Input
Clear to Send
Host ready bit
5
RXD/
Input
Send Data
Host receive data
6
RTS
Output
Request to Send
PMAC ready bit
7
DSR
Bidirect
Data Set Ready
Tied to "DTR"
8
SERVO
In/Out
Servo Clock
9
GND
Common Ground
10
+5V
Output
Voltage Reference
The baud rate for the RS-232 serial port is set by variable I54. At power-up reset, The Turbo PMAC2 PCI
Ultralite sets the active baud based on the setting of I54 and the CPU speed I52. Note that the baud rate
frequency is divided down from the CPU’s operational frequency. The factory default baud rate is 38400.
This baud rate will be selected automatically on re-initialization of the Turbo PMAC2 PCI Ultralite, either
in hardware using the re-initialization (E51) jumper or in software using the
$$$***
command.
To change the baud rate setting, set I54 to the corresponding value of desired frequency. Issue a
SAVE
and recycle power on the unit. For odd baud rate settings, refer to the Turbo Software Reference Manual.
I54 Baud Rate I54 Baud Rate
8
9600
12
38,400
9
14,400
13
57,600
10
19,200
14
76,800
11
28,800
15
115,200
Note
I54=12 (38400 baud) is the factory default setting.
SERVO and PHASE are outputs if jumper E1 is OFF; they are
inputs if jumper E1 is ON.
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