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2-11
2
2.6
SERIAL INTERFACE CONNECTIONS
2.6.1 8099 Serial Port
The 8099's serial port is a DTE (Data Terminal Equipment) interface on a DB-
25S female connector. The connector has both RS-232 and RS-422/RS-485
signals in accordance with EIA-STD - RS-530. RS-232 and RS-422 (RS-485)
signal selection is made by setting jumpers inside the 8099. See section 2.7
for the jumper setting instructions. Table 2-2 shows the 8099’s signal-pin as-
signments and signal directions.
2.6.2 RS-232 Connections to a Modbus Device
The minimum RS-232 connection uses just three lines to connect the unit to a
Modbus slave device. The lines are transmit data (TxD), receive data (RxD),
and Ground. The handshake lines can be left open or jumpered (4 to 5, 6 to 8
to 20). Set the 8099’s internal jumpers W4-W6 to 232 for RS-232 signals.
RS-232
AA
BA
BB
CA
CB
AB
CF
CD
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
TABLE 2-2 SERIAL CONNECTOR PIN ASSIGNMENTS
Direction
In Out
→
←
→
←
←
←
←
→
←
→
→
→
Signal
Chassis
Send Data (A)
Receive Data (A)
Request-to-Send (A)
Clear-to-Send (A)
Data Set Ready
Ground
Signal Detected (A)
Signal Detected (B)
Termination Network Low
Clear-to-send (B)
Send Data (B)
Receive Data (B)
Termination Network High
Request-to-send (B)
Data Terminal Rdy (A)
Data Terminal Rdy (B)
RS-422
RS-485
—
SD(A)
RD(A)
RS(A)
CS(A)
RR(A)
RR(B)
Term-
CS(B)
SD(B)
RD(B)
Term+
RS(B)
TR(A)
TR(B)
Содержание 8099
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