JHCTech BRAV-7501 User Manual page 24

3
5
7
9
(All of the above DIOs are TTL signals, digital inputs (high level 1: 2-5.25V, low level 0: 0-0.8V), digital
output (high level 1: minimum 2.4V, low level 0: Maximum 0.4V).)
2.3.6 COM Connector
The BRAV-7501 provides 2 serial ports of COM1/2 by 2*D-sub 9-pin connectors. COM1/2
configured as RS232、RS422 or RS485 by BIOS setup.
Table 2.7: COM1/2 Serial Ports Pin Assignments
Pin
1
2
3
4
5
6
7
8
9
GP72 4
GND 6
GP75 8
GP77
Figure 2. 12
RS-232 Signal RS-422 Signal
DCD TX-
RxD TX+
TxD RX+
DTR RX-
GND GND
DSR NC
RTS NC
CTS NC
RI NC
16
GP73
GP74
GP76
Table 2.7 for pin assignments.
RS-485 Signal
DATA-
DATA+
NC
NC
GND
NC
NC
NC
NC
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