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Serial Port Pinouts
9
8 Serial Port Pinouts
Table 7 describes the pinouts of the 9-pin D-sub serial ports.
Table 7: 9-Pin D-sub Serial Port Pinouts
Pin Function
2 Receive
3 Transmit
5 Ground
Note: Flow control signals are not supported.
9 Table of Hex Codes for Serial Communication (Protocol 2000)
The RS-232/RS-485 Protocol 2000 uses four bytes of information as shown in
Table 8. The data rate is set by the DIP-switches (see Table 5), with no parity, 8
data bits and 1 stop bit.
Table 8: Protocol Command Definition
MSB
LSB
DESTI-
NATION
INSTRUCTION
0
D
N5
N4
N3
N2
N1
N0
7
6
5
4
3
2
1
0
1st byte
INPUT
1 I6 I5 I4 I3 I2 I1 I0
7
6
5
4
3
2
1
0
2nd byte
OUTPUT
1 O6 O5 O4 O3 O2 O1 O0
7
6
5
4
3
2
1
0
3rd byte
MACHINE NUMBER
1
OVR
X
M4
M3
M2
M1
M0
7 6 5 4 3 2 1 0
4th byte
1
st
BYTE: Bit 7 – Defined as 0.
D – “DESTINATION”: 0 - for sending information to the switchers (from the PC);
1 - for sending to the PC (from the switcher).
N5…N0 – “INSTRUCTION”
The function that is to be performed by the switcher(s) is defined by the INSTRUCTION (6 bits). Similarly, if a function is performed via the
machine’s keyboard, then these bits are set with the INSTRUCTION NO., which was performed. The instruction codes are defined according to the
table below (INSTRUCTION NO. is the value to be set for N5…N0).
2
nd
BYTE: Bit 7 – Defined as 1.
I6…I0 – “INPUT”.
When switching (ie. instruction codes 1 and 2), the INPUT (7 bits) is set as the input number which is to be switched. Similarly, if switching is done
via the machine’s front-panel, then these bits are set with the INPUT NUMBER which was switched. For other operations, these bits are defined
according to the table.
3
rd
BYTE: Bit 7 – Defined as 1.