2-14
2
2.9
MODbUS SERIAL INTERFACE CONNECTIONS
2.9.1 9009 and 9099 Serial Port
The 9009 and 9099's serial port is a DTE (Data Terminal Equipment) interface
on a 9-pin DE shell connector. The 9009 has a male connector, the 9099 has
a female connector. The user selects RS-232 or RS-422/RS-485 signals by
setting jumpers on the PC board and by using the SYST:COMM:SER:RS485
command to enable/disable tristating the Tx signal pair when not transmitting.
Table 2-2 shows the signal-pin assignments and signal directions.
RS-232
BB (RxD)
BA (TxD)
AB (GND)
Pin
1
2
3
4
5
6
7
8
9
TAbLE 2-2 SERIAL CONNECTOR PIN ASSIGNMENTS
Direction
In Out
←
←
→
→
←
←
Signal
Receive Data (B)+
Receive Data (A)-
Send Data (A)-
Send Data (B)+
Ground
not used
not used
Alarm input #1
Alarm input #2
RS-422
RS-485
RD(B)
RD(A)
SD(A)
SD(B)
2.9.2 RS-232 Connections to a Modbus Device
The RS-232 connection uses just three lines to connect the unit to a Modbus slave
device. The lines are transmit data (TxD), receive data (RxD), and Ground.
Set the internal jumpers as shown in Table 2-3 for RS-232 signals.
Figure 2-6a shows the RS-232 connection to a Watlow F4 Temperature Con-
troller. Both interfaces transmit on pin 2 and receive on pin 3.
Figure 2-6b shows the same signals coming through a bulkhead connector on
the temperature chamber wall. Obtain the bulkhead pins numbers from your
Chamber manufacturer or use a voltmeter to determine the pin numbers before
trying to connect the 9099 to the chamber with a ‘standard’ RS-232 cable. You
may need a ‘null-modem’ or a specially wired cable to make the connections.
Use an RS-232 Signal tracker or a DVM to find the Modbus TXD signal. The
TXD signal will be -6 to -12 Vdc.
Содержание 9099
Страница 20: ...1 16 1 Figure 1 1 9009 Outline Dimensions ...
Страница 24: ...1 20 1 Figure 1 3 9099 Certificate of Compliance ...
Страница 54: ...3 8 3 Figure 3 1 Status Reporting Structure Flash Configuration Reset ...
Страница 94: ...3 48 3 This page left intentionally blank ...
Страница 100: ...4 4 6 This page is left intentionally blank ...
Страница 161: ...A 49 A4 Refer to the ErrorLogger utility for the error value definitions Error Meaning 0 No error ...