Chapter 5. Communications
192
PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual
GFK-2222AD
COM1 (RS232, RJ45 Connector)
The RJ45 Connector is provided for COM1 on CPE400
only. It has the following pinout.
Pin No.
79
Signal Name
Description
Figure 48: COM1 Port CPE400
1
NC
No Connection
2
NC
No Connection
3
TX
Transmit Data
4
RX
Receive Data
5
0V
Signal Ground
6
NC
No Connection
7
NC
No Connection
8
NC
No Connection
COM2 (RS-485, 15-pin Female D-sub Connector)
–
RX7i CPU/CRU Models
This port does not 5Vdc volts, therefore RS-485 to RS-232 conversion requires a converter that
is self-powered. It does not support the RS-485 to RS-232 adapter IC690ACC901.
This is a DCE port that allows a simple straight-through cable to connect with a standard AT-style
RS-232 port.
COM2 RS-485 Signals
Pin No. Signal Name Description
1
Shield
Cable Shield
Located at the bottom right of the connector
as viewed from the front of the module.
2
NC
No Connection
3
NC
No Connection
4
NC
No Connection
5
NC
No Connection
6
RTS(A)
Differential Request to Send A
7
0V
Signal Ground
8
CTS(B‘)
Differential Clear To Send
9
RT
80
Resistor Termination
10
RD(A‘)
Differential Receive Data A
11
RD(B‘)
Differential Receive Data B
12
SD(A)
Differential Send Data A
13
SD(B)
Differential Send Data B
14
RTS(B’)
Differential Request To Send B
15
CTS(A’)
Differential Clear To Send A
79
Pin 1 is the leftmost pin as shown in Figure 48.
80
To provide termination using the built-in 120
Ω
resistor, install a jumper between pins 9 and 10.
81
To provide termination using an external resistor, connect a user-supplied resistor across pins 10 and 11.
