Addi-Data APCI-7300-3, Important Information Manual

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APCI-7xxx-3 Figures and Tables
36
TA: Tx422+ RA: Rx422+
TB: Tx422- RB: Rx422-
Rab: Connection to a terminal resistor
(1): Cable connection to 100
Ω
/120
Ω
terminates the RS422/RS485 lines
with the 100
Ω
/120
Ω
resistor.
7.2 Pin assignment: APCI-7420-3, APCI-7300-3 and
APCI-7500-3(/4C)
Fig. 7-2: 9-pin SUB-D male connector
Table 7-2: Pin assignment of the 9-pin connector
RS485 RS422 Current Loop RS232
Pin Pin
RS232 Current Loop RS422 RS485
120
Ω
100
Ω DSR 6 1 DCD +XMIT-CL-DATA TA
Tsource RTS 7 2 RxD -XMIT-CL-DATA TB
Rsource CTS 8 3 TxD +RCV-CL-DATA RA Tx/Rx+
Tx/Rx- RB -RCV-CL-DATA RI 9 4 DTR Rab (1)
5 GND GND GND GND
TA: Tx422+ RA: Rx422+
TB: Tx422- RB: Rx422-
Rab: Connection to a terminal resistor
(1): Cable connection to 100
Ω
/120
Ω
terminates the RS422/RS485 lines
with the 100
Ω
/120
Ω
resistor.