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Horner-apg QX351 OCS HEQX351C103 Manual de usuario Pagina 25

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MAN0892-03-EN CH.5
February 25, 2010 Page 25 of 109 #1039
CHAPTER 5: SERIAL COMMUNICATIONS
5.1 Overview
All QX351 OCS models provide two serial ports, which are implemented with 8-pin modular RJ45
connectors, and are labeled MJ1 and MJ2. Either MJ1/MJ2 serial port can be used for QX351 OCS
programming by connecting it to the COM port of a PC running Cscape. In addition, both MJ1 and MJ2
can be used for application-specific communication, using a variety of standard data exchange protocols.
5.2 Port Descriptions
The MJ1 serial port contains both a half-duplex RS-485 interface and an RS-232 interface with RTS/CTS
handshaking.
The MJ2 serial port contains both a full-duplex RS-485 interface and an RS-232 interface with no
handshaking. Both the MJ1 and MJ2 RS-485 interfaces provide switchable termination and bias resistors
internally.
5.3 Wiring
Figure 5.1 along with Table 5.1and Table 5.2 show how the MJ1 and MJ2 serial port pins are assigned.
Figure 5.1: MJ Serial Port Connector
Table 5.1 – MJ1 Serial Port Pin Assignments
Pin Signal Signal Description Direction
1 RX/TX+ RS-485 Receive/Transmit Positive In/Out
2
RX/TX−
RS-485 Receive/Transmit Negative In/Out
3 CTS
1
RS-232 Clear to Send Out
4 RTS
1
RS-232 Request to Send In
5 +5* +5 VDC 60mA max Out
6 0V Ground
−
7 TD
1
RS-232 Transmit Data In
8 RD
1
RS-232 Receive Data Out
Signals are labeled for connection to a DTE device
8
1
Note:
MJ1 and MJ2 look the
same but have different pin
assignments and functions.
•
••
• * +5 on QX351 Rev E and later
•
••
• * +5 on all revisions XLt, XL6 and QX351
Pin
MJ1 Pins
Signal Direction
8
TXD OUT
7
RXD IN
6
0 V Ground
5*
+5 60mA OUT
4
RTS OUT
3
CTS IN
2
RX- / TX- IN / OUT
1
RX+ / TX+ IN / OUT
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