2-21
2
RS-232
AA
BA
BB
CA
CB
CC
AB
CF
CD
Direction
In Out
→
←
←
←
→
←
→
Signal
Chassis
Send Data (A)
Receive Data (A)
Request-to-Send (A)
Clear-to-Send (A)
Data Set Ready held on
Ground
Signal Detected held on
Send Data (B) +
Receive Data (B) +
Data Terminal Rdy (A)
2.2 kohm resistor to gnd
RS-422
RS-485
—
SD(A)
RD(A)
SD(B)
RD(B)
Notes:
1. CA jumpered back to CB.
2. CC and CF held high by 2.2 kohm resistor to 5 Vdc.
3. RS-232 specification defines BA as data being transmitted to the DCE
device; BB is the received data being transmitted to the DTE device.
TABLE 2-4 2367 SERIAL PIN ASSIGNMENTS (J1)
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
