43
CET Electric Technology
DB9 Female Connector
Pin
Description
Pin
Description
1
NC
6
RX- (RS-422 Rx- signal)
2*
RXD (RS-232 send signal)
7
RX+ (RS-422 Rx+ signal)
3*
TXD (RS-232 receive signal)
8
TX-/D-(RS-422 Tx-/RS-485 D- signal)
4*
5V (Power for LCD HMI)
9
TX+/D+ (RS-422 Tx+/RS-485 D+ signal)
5
GND
* Pins 2, 3 and 4 are only used for the small Dot-Matrix LCD display
Table 2-13 DB9 Connector Pin Description for P1/HMI
The 7” Touch-Screen HMI is equipped with a DB9 Male connector that supports RS-422. The DB9 cable
that comes with the HMI connects the PMC-592’s P1/HMI port (DB9 Female connector) with the HMI’s
DB9 Male connector (HMI). The following diagram illustrates the display cable’s internal wiring:
Figure 2-43 Display Cable’s Internal Wiring
2.5.3 P2 (RS485) Wiring
The PMC-592 provides a second RS485 port (P2). Up to 32 devices can be connected on a RS485 bus
where the overall length of the RS485 cable connecting all devices should not exceed 1200m.
If the master station does not have a RS485 communications port, a RS232/RS485, USB/RS485 or
Ethernet/RS485 converter with optical isolation and surge protection should be used. The following
figure illustrates the RS485 communications connections on the PMC-592:
Figure 2-44 P2 (RS485) Communications Connections
2.5.4 PMC-592 External DI Module Wiring
The optional external PMC-521D Digital Input Module can be connected via P2 since Firmware V1.00.03.
Up to four PMC-521Ds can be connected when the
P2 Operating Mode
setup parameter (Modbus
register # 6381) is configured as
External DI Module
instead of
Modbus RTU
. The following figure
illustrates the P2 (RS485) communications connections with the PMC-521D:
Figure 2-45 P2 (RS485) Communications Connections with PMC-521D